Best Solar Installation Companies for Small Businesses and Commercial Buildings (2026)

The research in brief

Sunrun is the consensus leader in this 7-platform AI study of commercial small business solar installation, named by 4 of 7 platforms (57.1%) at an average listed position of 4.5. However, the evidence behind that ranking is unusually conflicted: platforms split between describing Sunrun as a commercial PPA/lease provider and describing it as a residential-only company whose U.S. commercial work is limited to multifamily housing. Freedom Solar Power (3 mentions, 42.9%, average 4.0) is the strongest alternative for owner-occupied commercial buildings needing turnkey design-build. Solar Landscape (2 mentions, average 1.5) is the best fit for large-roof property owners seeking zero-CapEx rooftop leasing, and Greenskies Clean Energy (2 mentions, average 2.5) suits buyers wanting developer-owned PPAs. The principal limitation: this index measures which companies AI platforms name and how they describe them, not verified installation quality, pricing, or customer outcomes.

Research Snapshot

• Topic: Best commercial solar installers for commercial small business solar installation
• Target buyer: Small business or commercial property owner in the United States
• Use case: Installing solar on a commercial building to lower operating energy costs and use business tax incentives, with larger-scale commercial capability, tax-credit knowledge, and minimal disruption to daily operations
• Platforms included (7): ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, Gemini
• Research date: 2026-10-01 (authoritative run date)
• Unique entities named across platforms: 42
• Qualifying entities: 6
• Eligibility rule: Named by at least two platforms during ranking discovery
• Ranking rule: Platform mentions, then average listed rank, then best listed rank

Platform-reported research dates differ from the authoritative run date: DeepSeek reported 2026-08-08 for Sunrun, 2026-01-15 for Freedom Solar Power, 2026-06-12 for Solar Landscape, 2026-06-06 for Greenskies Clean Energy, 2026-06-11 for StraightUp Solar, and 2026-06-11 for Teichert Solar. These are provenance metadata and do not independently prove freshness.

The Consensus Ranking

Questions explored

• What are the best commercial solar installers for small business and commercial building solar installation in 2026?
• Which commercial solar company was named by the most AI platforms for small business solar with tax incentive support?
• How many AI platforms named each commercial solar installer for small business projects?

Platform mentions count only platforms that named the entity during ranking discovery. All 7 platforms evaluated fit, but not every platform named every entity.

Which provider fits your needs?

Questions explored

• Which commercial solar installer should a small business choose if it wants zero upfront cost through a PPA or lease?
• Which commercial solar company is best for a small business that wants to own the system and claim the federal tax credit itself?
• Which commercial solar installer should a property owner with a large warehouse roof choose for rooftop lease income?

1. Sunrun

Questions explored

• Is Sunrun worth it for commercial small business solar installation, and what are its main drawbacks?
• Does Sunrun actually offer commercial solar for a 25–500 kW small business system, or is it residential-only?
• Which commercial solar company should a small business choose instead of Sunrun if it wants to own the system and claim the tax credit?

Sunrun ranks first because it was named by more platforms (4 of 7) than any other entity, despite a weak average listed position of 4.5. The verdict is genuinely split: Grok ranked it first and described a commercial PPA/lease offering for 25–500 kW systems ^[121], while Claude rated it "weak" and Gemini rated it "weak," with Gemini stating that in the United States Sunrun's commercial operations are "strictly limited to multifamily residential developments and affordable housing projects" ^[73]. Buyers should treat Sunrun as a shortlist candidate only if they receive a specifically documented commercial proposal.

Why it ranked here. Four platforms named Sunrun during ranking discovery: Claude (rank 5), DeepSeek (rank 5), Grok (rank 1), and Kimi (rank 7). That combination of high mention count and mid-to-low average position is exactly what the ranking rule produces at rank 1.

Best suited for. A small property owner who receives a specifically documented commercial proposal from Sunrun or an authorized commercial partner; a buyer prioritizing third-party ownership, low upfront cost, monitoring, maintenance, and a long-term PPA or lease rather than asset ownership and tax benefits.

Main strengths for the use case. Sunrun documents PPA and lease structures in which it owns the equipment and handles installation, maintenance, monitoring, and insurance, which can reduce upfront capital requirements ^[110]. Its SEC-filed materials describe monthly and prepaid PPA and lease agreements with typical 20- or 25-year terms and performance guarantees in many agreements ^[14]. It is a large, publicly traded counterparty (Nasdaq: RUN) with billions in annual revenue, which reduces mid-contract counterparty risk for long commitments ^[126]. Grok reported commercial PPA/lease offerings for mid-market and retail clients with 10–20 year terms ^[121].

Main limitations. The commercial product itself is unverified. OpenAI could not verify a current, clearly documented Sunrun commercial division, 25–500 kW product, commercial design capability, or commercial proposal process, and noted Sunrun's public description says it provides solar primarily to residential customers ^[17]. Anthropic found no dedicated commercial small business product line and noted Sunrun's residential pricing averages $3.50–$4.50 per watt against a $2.80 per watt national average ^[118]. Google stated Sunrun does not design, install, or finance solar for standard commercial buildings such as offices, retail storefronts, warehouses, or industrial spaces, and warned that "Sunrun Solar" commercial packages advertised for 13 kW to 100 kW systems belong to a separate, unrelated Australian company ^[148]. Under a Sunrun-owned lease or PPA, the buyer generally would not own the system, so the buyer should verify which party receives credits, depreciation, and energy certificates ^[176]. Long 20–25 year terms with no mid-contract exit except prepayment or transfer create inflexibility for property sales or business transitions ^[164].

Pricing or cost summary. No public commercial price, rate card, commercial PPA rate, lease payment, escalator, or 25–500 kW proposal was verified ^[17]. Residential reference points reported by platforms: lease payments of roughly $80–$160 per month on 8–10 kW systems with 0–2.9% annual escalators, and installed costs of $3.50–$4.50 per watt ^[118]. Kimi cited commercial PPA benchmarks of $0.06–$0.12/kWh for systems over 100 kW with 0–3% escalators, explicitly labeled as market benchmarks rather than Sunrun-specific ^[140]. Pricing confidence across platforms: low.

Where platforms disagreed. This is the most contested entity in the index. Grok described an active commercial PPA/lease offering with zero upfront cost ^[115]. Deepseek called it a "mixed fit" with a publicly marketed commercial solar and storage offering but thin verifiable detail ^[108]. Perplexity called it "mixed," noting the strongest public documentation is general agreement language rather than dedicated small-business commercial program details ^[14]. OpenAI and Kimi both rated it "uncertain," and Kimi suggested commercial projects may be originated through Sunrun financing but physically installed by independent EPC contractors paid $0.60–$1.40/W ^[131]. Anthropic and Gemini rated it "weak." The disagreement is material and unresolved.

For the complete fit review, see the Sunrun analysis.

2. Freedom Solar Power

Questions explored

• Is Freedom Solar Power a good choice for a small business commercial solar installation with a 25-year workmanship warranty?
• Which commercial solar installer should a buyer choose if they need in-house NABCEP-certified crews rather than subcontractors?
• What should a buyer verify about Freedom Solar Power's commercial financing and post-2026 warranty service before signing?

Freedom Solar Power ranks second with 3 platform mentions (42.9%) and the best average listed position among multi-mention entities at 4.0. Six of seven platforms that assessed fit rated it "good"; only Kimi rated it "uncertain" for lack of independent verification. It is the strongest ranked option for an owner-occupied commercial building that wants a turnkey design-build installation.

Why it ranked here. Three platforms named it during ranking discovery: Claude (rank 6), Gemini (rank 4), and Grok (rank 2). Its best position of 2 is the highest among entities ranked below Sunrun.

Best suited for. Owner-occupied commercial buildings with suitable roofs and substantial daytime electricity consumption; retail, automotive, storage, office, manufacturing, and nonprofit facilities where Freedom Solar has documented commercial project experience; businesses seeking a proposal combining solar design, permitting, installation, optional storage, and maintenance support.

Main strengths for the use case. Its published commercial portfolio includes systems from approximately 14 kW to 1.97 MW across retail, office, storage, manufacturing, automotive, healthcare, and nonprofit projects ^[8]. It states it does not subcontract installations and uses in-house NABCEP-certified installers and licensed electricians ^[85]. It advertises a 25-year workmanship warranty covering installation and electrical work, including a 10-year roof-penetration warranty ^[10]. Commercial customers can use cash purchase, operating lease, capital lease, or PPA structures ^[162]. It states it will help businesses identify federal, state, and local incentives ^[4].

Main limitations. Commercial pricing and financing economics are proposal-based and not publicly transparent ^[8]. Minimal-disruption claims are company statements rather than independently verified, and commercial outage procedures are unspecified ^[12]. Tax-incentive assistance is described, but eligibility and credit calculations are not guaranteed ^[178]. Warranty coverage varies by equipment and may not provide uniform 25-year coverage for inverters, batteries, or monitoring ^[10]. Geographic coverage is inconsistent across sources: full-service offices are concentrated in Texas and Florida, while the company claims commercial installation in all 48 contiguous states ^[13]. A 2026 trade article reported Freedom Power sold service rights for its national commercial solar portfolio to Otovo for warranty service on 400 commercial systems, creating post-sale service-continuity uncertainty ^[191]. Grok noted customer reports of service call fees around $500 and delays in warranty repairs ^[158].

Pricing or cost summary. No public commercial price, price-per-watt range, financing rate, lease/PPA rate, or contract term was verified ^[8]. Google reported commercial installation estimates of $3 to $5 per square foot and O&M costs of $10 to $25 per kW annually ^[70]. Anthropic cited a 2018 commercial financing vehicle allowing up to 70% of installation cost financed with one-week underwriting, but current availability is unverified ^[189]. Pricing confidence: low.

Where platforms disagreed. Kimi rated the fit "uncertain," finding no independent verification of commercial system design capability, tax incentive expertise, or specific financing options, and noted the company appears primarily residential-focused in public discourse ^[1]. All other assessing platforms rated it "good." Google flagged legacy SunPower warranty gaps: following SunPower's bankruptcy in late 2024, Freedom Solar noted it cannot cover service and labor costs of third-party product failures on legacy SunPower systems ^[146]. Sources also conflict on employee count (760 per PitchBook versus 501–1,000 per ZoomInfo) and on geographic scope ^[202].

For the complete fit review, see the Freedom Solar Power analysis.

3. Solar Landscape

Questions explored

• Is Solar Landscape worth it for a small business with a large warehouse roof that wants zero-CapEx rooftop lease income?
• What minimum rooftop size does Solar Landscape require for a commercial rooftop solar lease?
• Which commercial solar company should a small business choose if it wants to own the system rather than lease its roof?

Solar Landscape ranks third with 2 platform mentions (28.6%) but the best average listed position in the entire index at 1.5, including a first-place ranking from Gemini. It is a specialist, not a generalist: it develops, finances, builds, owns, and operates front-of-the-meter rooftop solar, typically under a long-term rooftop lease in which the property owner pays no design, permitting, equipment, construction, operations, or maintenance costs ^[28].

Why it ranked here. Two platforms named it during ranking discovery: DeepSeek (rank 2) and Gemini (rank 1). Its average position of 1.5 is the strongest in the index, but its mention count of 2 caps its overall rank below Sunrun and Freedom Solar Power.

Best suited for. Warehouse, distribution, manufacturing, retail, office, or self-storage owners with large, structurally suitable rooftops; owners prioritizing no upfront capital, long-term rooftop income, and outsourced development, construction, ownership, and maintenance; multi-property commercial owners seeking repeatable deployment across a portfolio.

Main strengths for the use case. It states it has developed more than 500 commercial-scale projects and over 750 MWdc, with $2.5 billion in capital deployed ^[20][e3:official:C1]. The standard host model is zero-CapEx for the property owner ^[28]. It reports typical rooftop lease rates of $0.25–$0.85 per square foot per year, which is company-published and market-dependent ^[30]. It says most construction work is external and coordinated to minimize interference with tenants and operations ^[28]. It also markets community solar hosting and subscriptions, which broadens applicability beyond direct rooftop ownership ^[83].

Main limitations. The stated typical property profile requires at least 40,000 square feet of usable rooftop space, which excludes many small commercial buildings ^[28]. The standard model appears oriented to front-of-meter or community-solar generation rather than direct onsite load offset, so it may not reduce the host business's own electric bill ^[32]. Twenty-year lease commitments may reduce flexibility for refinancing, redevelopment, roof replacement, or property sale ^[28]. Tax-credit and depreciation outcomes for the property owner are not clearly described, and the buyer should not assume it receives owner-level tax benefits under the standard lease model ^[20]. Multiple independent customer reviews from 2024–2025 documented enrollment-to-activation delays of 9–12+ months with inadequate status communication ^[157]. BBB customer reviews average 3.55/5 across 11 reviews ^[157].

Pricing or cost summary. No property-specific price was found. The standard public model is zero upfront capital in exchange for a long-term rooftop lease and lease payments ^[28]. Company-published indicative rooftop lease rates are $0.25–$0.85 per square foot per year, explicitly market-dependent and not a binding quote ^[30]. Typical commercial rooftop lease term is 20 years ^[28]. Pricing confidence: low.

Where platforms disagreed. Google rated the fit "mixed" and called Solar Landscape a "poor fit for typical small businesses with small rooftop footprints" ^[74]. Anthropic and Perplexity rated it "good" for commercial property owners wanting turnkey rooftop or community solar with minimal operational burden ^[26]. Deepseek, Grok, Kimi, and ChatGPT all rated it "mixed," citing the large-scale focus and lack of published pricing. Geographic coverage is also inconsistent: consumer-facing sources cite three states (NJ, NY, CT), while Solar Power World 2025 data shows installations in NJ, IL, and MD ^[163]. Company-owned citations materially outnumber independent citations in this bundle, so company claims should not be described as independently verified.

For the complete fit review, see the Solar Landscape analysis.

4. Greenskies Clean Energy

Questions explored

• Is Greenskies Clean Energy a good fit for a small business that wants a commercial solar PPA with no upfront cost?
• What minimum project size does Greenskies Clean Energy require, and does it serve projects below $1 million?
• Which commercial solar installer should a buyer choose if they need combined roof replacement and solar financing?

Greenskies Clean Energy ranks fourth with 2 platform mentions (28.6%) and an average listed position of 2.5. Six of seven assessing platforms rated it "good"; Kimi rated it "uncertain," arguing its capabilities and pricing are geared toward larger commercial, industrial, and multi-site portfolio clients rather than 25–500 kW small business installations ^[86].

Why it ranked here. Two platforms named it during ranking discovery: Gemini (rank 2) and Grok (rank 3). Its average position of 2.5 is second-best in the index.

Best suited for. Commercial property owners with suitable rooftops, parking areas, or portfolios of properties; businesses seeking a Solar PPA, Property PPA, lease, or other third-party-owned structure; projects requiring commercial development, financing, construction, ownership, operations, and maintenance; buildings needing roof replacement or major roof work that could be combined with solar financing.

Main strengths for the use case. It states it originates, develops, constructs, finances, owns, operates, and maintains commercial solar projects, with documented rooftop, carport, ground-mount, and utility-scale project types ^[100]. It offers a Solar and New Roof solution combining roof renovation and solar with no stated upfront cost and a 25-year solar-system warranty ^[106]. It states it can structure on-balance-sheet or off-balance-sheet financing and offers PPAs, leases, development capital, construction capital, take-out capital, tax-equity financing, debt financing, and incentive-supported structures ^[100]. It reports more than 400 MW developed and constructed across more than 735 projects in 19 states ^[100]. Perplexity noted a public example of a 130-kW rooftop system under a 25-year PPA with ongoing maintenance by Greenskies ^[89].

Main limitations. Public pricing is not transparent, and the stated financing range begins at approximately $1 million, creating uncertainty for smaller commercial systems ^[100]. Public materials do not establish a standardized small-business package or published small-project minimum ^[100]. Tax-credit and depreciation treatment for the specific buyer is not publicly explained, and under typical PPA structures the customer does not own the asset or claim the credits ^[130]. Installation disruption, outage planning, construction duration, and service-level commitments are not publicly quantified ^[100]. Geographic coverage is inconsistent across sources: one source claims approximately three states (CT, CA, NJ), another lists 13+, and the company states 19 ^[205]. Company-owned citations materially outnumber independent citations in this bundle.

Pricing or cost summary. No project-specific purchase price, PPA rate, lease payment, escalation rate, or minimum system size was publicly identified ^[100]. Public materials describe 20-year PPA and lease structures, with one public example citing a 25-year PPA ^[100]. Financing relationships are stated to cover transactions from $1,000,000 to more than $100,000,000 ^[100]. Pricing confidence: low.

Where platforms disagreed. Kimi rated the fit "uncertain," noting no verified small business-specific service or financing programs below 100–500 kW and no documented SBA loan packaging, equipment-secured loans, or C-PACE facilitation ^[86]. All other assessing platforms rated it "good." Google described it as "an excellent, top-tier commercial solar partner for medium-to-large small businesses, commercial real estate developers, and portfolio owners" but "likely too large-scale for mom-and-pop storefronts" ^[101]. Cumulative MW installed varies across sources from 270 MW to 400+ MW depending on date ^[180].

For the complete fit review, see the Greenskies Clean Energy analysis.

5. StraightUp Solar

Questions explored

• Is StraightUp Solar worth it for a small business commercial solar installation in Illinois or Missouri?
• What financing options does StraightUp Solar offer for commercial solar, including USDA REAP and Missouri PACE?
• Which commercial solar installer should a buyer choose if they need a 25-year workmanship warranty rather than a 10-year one?

StraightUp Solar ranks fifth with 2 platform mentions (28.6%) and an average listed position of 5.5, the widest platform spread in the index: Perplexity ranked it 3rd while Gemini ranked it 8th. Five of seven assessing platforms rated it "good"; DeepSeek rated it "mixed" and Kimi rated it "uncertain." It is the most geographically constrained entity in the index, confirmed only in Illinois and Missouri ^[117].

Why it ranked here. Two platforms named it during ranking discovery: Gemini (rank 8) and Perplexity (rank 3). Its best position of 3 is the strongest among the bottom three entities.

Best suited for. Small businesses, farms, nonprofits, and commercial property owners in Illinois or Missouri; owners seeking turnkey design, permitting, installation, monitoring, and maintenance; buyers considering ownership financing, a PPA, a lease, or Missouri PACE financing.

Main strengths for the use case. It publishes commercial guidance on federal tax incentives, SRECs, safe-harbor planning, and third-party ownership ^[38]. Publicly described financing options include commercial loans through Clean Energy Credit Union, PPAs or leases using third-party investors, USDA REAP grant assistance for eligible rural Illinois businesses and agricultural producers, and Missouri PACE financing that may fund up to 100% of project costs with repayment through a property-tax assessment ^[41]. It states that its commercial guarantees apply to projects below 800 kW and that it has completed more than 3,200 projects across Missouri and Illinois ^[41]. It describes monitoring, performance reviews, preventative maintenance, corrective repairs, and roof-work panel removal and reinstallation ^[46]. It is an Approved Vendor under Illinois Solar for All and cites expertise in SRECs, smart inverter rebates, and MACRS depreciation ^[47].

Main limitations. Publicly confirmed geography is concentrated in Illinois and Missouri; national availability is unclear ^[117]. No public commercial price sheet or standard financing term sheet exists ^[41]. Business-disruption controls and construction timelines are not publicly documented ^[41]. Warranty information is inconsistent: the commercial page states a one-year workmanship and labor warranty for projects below 800 kW, while BBB reports in-house 10-year production and workmanship warranties ^[152]. Customers have reported unexpected costs, including a $3,500 charge for concrete piers presented after paying over half of a $25,000 initial cost during the pre-permit stage, and at least one customer considered cancellation due to risk of further surprises ^[196]. Panel removal labor was documented at $7,000 in at least one case, above the US average of $1,000–$2,000 ^[129]. Some customers reported the company would not service systems not originally purchased from it ^[136].

Pricing or cost summary. No project pricing, installed-cost schedule, PPA rate, lease payment, loan APR, or standard commercial contract price was publicly identified ^[41]. Commercial loan amounts publicly described range from $50,000 to $1.5 million with stated terms of 10, 12, or 15 years ^[41]. Missouri PACE financing is described as repayment through an annual property-tax assessment for terms up to 20 years ^[41]. Monitoring service agreements start at $199 annually for systems up to 100 kW ^[55]. Pricing confidence: low.

Where platforms disagreed. Google ranked it 8th and described it as "an excellent, highly-rated regional choice" but strictly limited to two states ^[39]. Perplexity ranked it 3rd and called it "a good, not best-in-class, fit" with limited public pricing and unclear standard contract terms ^[39]. Deepseek found no public, verifiable information on commercial financing, tax incentive expertise, or disruption minimization ^[33]. Kimi found no independently verified evidence of commercial-scale design capability, specific financing programs, warranty terms, or project timelines ^[33]. The company website states more than 3,200 completed projects while its homepage search result states more than 1,700 installations, an unexplained difference ^[41].

For the complete fit review, see the StraightUp Solar analysis.

6. Teichert Solar

Questions explored

• Is Teichert Solar a good choice for a small business commercial solar project, or is it built only for large C&I and public-sector work?
• Does Teichert Solar offer commercial solar financing, PPAs, or leases for small business buyers?
• Which commercial solar installer should a California property owner choose for a solar carport or ground-mount system with heavy civil work?

Teichert Solar ranks sixth with 2 platform mentions (28.6%) and the weakest average listed position in the index at 7.0. It is the most contested entity on identity: DeepSeek and Kimi both rated the fit "uncertain" because they could not verify that a distinct Teichert commercial solar business exists, while ChatGPT, Claude, and Perplexity rated it "good" for construction-intensive commercial projects ^[59].

Why it ranked here. Two platforms named it during ranking discovery: Claude (rank 9) and Gemini (rank 5). Its best position of 5 is the lowest best-position among all qualifying entities.

Best suited for. Commercial properties in California and selected other U.S. markets requiring rooftop, carport, elevated, or ground-mount construction; projects where in-house engineering, foundations, trenching, paving, grading, and structural work can reduce subcontractor handoffs; larger commercial or public-sector projects, including parking canopies and ground-mounted systems with fixed-tilt or single-axis tracking.

Main strengths for the use case. It states its renewable-energy group provides design-build engineering and construction for solar carports, elevated and garage-top structures, fixed-tilt ground mounts, and single-axis trackers ^[61]. It describes self-performed foundations, trenching, paving, concrete, grading, underground conduit, and other civil work, and cites multi-megawatt commercial and public projects ^[61]. Documented projects include a 3.35 MW solar carport at Grossmont College and a 2.23 MW ground-mount system at Adventist Health Delano ^[61]. It reports over 650 MW installed and a #50 ranking among U.S. solar contractors in 2026, with 114,429 kW of C&I installed in 2025 ^[194]. Google reported it topped Solar Power World's 2026 commercial solar contractor list with 114,430 kW installed in 2025 ^[188].

Main limitations. Public information is weighted toward large commercial, public, developer, and EPC work rather than standardized small-business solar offerings ^[61]. No verified public pricing or customer-facing commercial financing terms exist, and no Teichert-owned PPA, lease, loan, or C-PACE program was identified ^[61]. No verified public description of tax-credit modeling, depreciation guidance, or incentive application support exists ^[61]. No verified standard O&M, monitoring, production-guarantee, or long-term service package exists ^[61]. Geographic coverage is concentrated in California and Texas, with limited presence in Arizona and Colorado ^[194]. Solar Power World classifies Teichert Solar as an "Installation Subcontractor," suggesting it may work with EPCs or developers rather than directly with end-user small businesses ^[188]. Deepseek and Kimi could not verify that a distinct Teichert commercial solar division exists at all ^[59].

Pricing or cost summary. No public project pricing, rate card, financing terms, standard contract form, or cancellation policy was identified ^[61]. Google stated all projects are priced through a custom design-build bidding process suited for high-budget commercial and civil infrastructure clients, with custom engineering and structural design fees plus permitting and utility interconnection assessment costs ^[59]. Pricing confidence: low.

Where platforms disagreed. Deepseek and Kimi rated the fit "uncertain" and could not confirm a Teichert solar business, published service catalog, pricing, financing, incentive-advisory capability, or independent reviews ^[59]. OpenAI, Claude, and Perplexity rated it "good" for construction-intensive commercial projects ^[61]. Google rated it "mixed," calling it "a premier commercial solar contractor" but "a poor fit for typical micro-commercial or main-street small businesses" ^[188]. Total installed capacity is reported as both 425 MW and 650 MW across sources, and employee count varies from 110 to 200 ^[194]. The normalization audit noted conflicting official domains and an unresolved identity, with official-site retrieval failing for one or more mentions ^[59].

For the complete fit review, see the Teichert Solar analysis.

What this study reveals

Questions explored

• What do AI platforms consistently say about commercial solar installers for small business projects in 2026?
• Why do AI platforms disagree about whether Sunrun offers commercial solar for small businesses?

Three structural patterns emerge from this 7-platform study.

First, the market the platforms describe is not one market. The ranked entities split into three distinct business models: third-party-owned PPA/lease providers (Sunrun, Solar Landscape, Greenskies Clean Energy), turnkey design-build EPCs (Freedom Solar Power, StraightUp Solar), and construction and civil contractors (Teichert Solar). A small business owner asking an AI assistant for "the best commercial solar installer" will receive answers drawn from all three models, even though the models serve fundamentally different buyer needs.

Second, commercial pricing transparency is near-zero across the entire index. Not one of the six qualifying entities publishes a standard commercial price, rate card, or financing term sheet. Every platform that assessed pricing rated its confidence as "low" for every entity. The only published figures in the evidence are company-published indicative ranges: Solar Landscape's $0.25–$0.85 per square foot per year rooftop lease rate ^[30], StraightUp Solar's $50,000–$1.5 million commercial loan range ^[41], and Freedom Solar Power's $3–$5 per square foot commercial installation estimate reported by Gemini ^[70].

Third, the tax-incentive question is the sharpest dividing line. Under PPA and lease structures, the provider typically owns the system and claims the credits, so the business does not directly capture the Section 48E Clean Electricity Investment Credit or 5-year MACRS treatment ^[176]. Platforms repeatedly flagged this as a limitation for Sunrun, Solar Landscape, and Greenskies Clean Energy, and as a reason to choose an ownership-financed installer instead ^[176].

Where the AI Platforms Agreed

Questions explored

• Which commercial solar installers do all AI platforms agree are legitimate options for small business projects?
• What do AI platforms agree small business buyers must verify before signing a commercial solar contract?

Despite the ranking conflicts, platforms converged on several points.

• Commercial pricing is not publicly available anywhere in this index. Every platform that assessed pricing for every entity rated confidence low.
• PPA and lease structures shift tax benefits away from the business. OpenAI, Claude, Kimi, and Perplexity all independently noted that under third-party ownership the provider claims the credits and depreciation ^[176].
• Long contract terms create flexibility risk. Platforms consistently flagged 20–25 year terms as a constraint on property sales, refinancing, roof replacement, and business transitions ^[118].
• Business-disruption claims are unverified. No platform found independently verified commercial outage procedures, construction schedules, or business-continuity commitments for any entity.
• Freedom Solar Power's 25-year workmanship warranty is a genuine differentiator. Six of seven assessing platforms rated the fit "good" and cited the warranty package as a strength ^[10].
• StraightUp Solar's regional incentive expertise is real but geographically bounded. Platforms agreed it has documented Illinois and Missouri incentive knowledge and that it does not serve other states ^[47].

Where the AI Platforms Disagreed

Questions explored

• Why do AI platforms disagree about whether Sunrun is a commercial solar provider for small businesses?
• Which commercial solar installers have unresolved identity or capability questions that buyers must verify directly?

The disagreements in this index are material, not cosmetic.

Sunrun's commercial existence. Grok described an active commercial PPA/lease offering for 25–500 kW systems ^[121]. Google stated Sunrun's U.S. commercial operations are "strictly limited to multifamily residential developments and affordable housing projects" and that it "does not design, install, or finance solar systems for standard commercial buildings" ^[73]. OpenAI could not verify a current commercial division at all ^[17]. This is the single largest unresolved conflict in the index, and it affects the rank-1 entity.

Teichert Solar's identity. Deepseek and Kimi could not verify that a distinct Teichert commercial solar business exists ^[59]. OpenAI, Claude, Perplexity, and Gemini described documented commercial solar projects and rankings ^[61]. The normalization audit noted conflicting official domains and an unresolved identity.

Solar Landscape's target customer. Google called it a "poor fit for typical small businesses" ^[74]. Anthropic and Perplexity rated it "good" for commercial property owners wanting turnkey rooftop or community solar ^[26]. The disagreement is about whether a small business with a large roof counts as the target customer.

Greenskies Clean Energy's minimum project size. OpenAI noted the stated financing range begins at approximately $1 million ^[100]. Kimi found no verified small business-specific service or financing programs below 100–500 kW ^[86]. Google called it "excellent" for medium-to-large small businesses ^[101]. The practical minimum remains unverified.

StraightUp Solar's warranty terms. The company's commercial page states a one-year workmanship and labor warranty for projects below 800 kW, while BBB reports in-house 10-year production and workmanship warranties ^[152]. The controlling warranty language is unclear.

How to compare your options

Questions explored

• What should a small business owner check before choosing a commercial solar installer for a 25–500 kW project?
• Which commercial solar installer should a buyer choose if they want to own the system and claim the Section 48E tax credit directly?
• How should a buyer compare a commercial solar PPA against a cash purchase or commercial loan?

Start with ownership, not brand. If the business wants to claim the Section 48E Clean Electricity Investment Credit and 5-year MACRS treatment directly, a PPA or lease structure is the wrong instrument, because the provider typically owns the system and claims the credits ^[176]. In that case, prioritize ownership-financed installers with documented commercial tax-incentive support, such as Freedom Solar Power or StraightUp Solar, and verify the tax treatment with the buyer's own tax adviser.

If the business wants zero upfront capital and is willing to trade ownership benefits for predictable payments, the PPA/lease providers are the relevant shortlist: Sunrun, Solar Landscape, and Greenskies Clean Energy. For each, verify the exact contract term, escalator, production guarantee, buyout formula, property-sale and assignment provisions, and who receives each incentive.

If the property has a large roof and the owner wants lease income rather than bill savings, Solar Landscape is the specialist match, but confirm the 40,000 square foot threshold and whether the project will be front-of-meter or behind-the-meter ^[28].

If the project requires carports, canopies, ground mounts, or heavy civil work in California, Teichert Solar's construction depth is the differentiator, but verify directly that a Teichert solar contracting entity exists and will contract with the property owner ^[61].

If the property is in Illinois or Missouri, StraightUp Solar offers the most localized incentive expertise, including Illinois Solar for All, SRECs, USDA REAP, and Missouri PACE ^[47].

For a broader view of the category, see the solar panel installation and energy systems directory.

Methodology

This index was produced from a single standardized prompt sent once to each of 7 included AI platforms on the authoritative run date of 2026-10-01. The prompt asked which providers would be recommended for a small business owner installing solar on a commercial building to lower operating energy costs, take advantage of business tax incentives, handle a larger-scale commercial project, understand relevant tax credits, and schedule installation with minimal disruption to daily operations.

Platforms included: ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, and Gemini. Each platform's response was parsed for named entities. Entities named by at least two platforms qualified for the final ranking. The final ranking order is determined by platform mentions, then average listed rank, then best listed rank, using the supplied final ranking table as the sole authority.

Entity evidence bundles were used as the authority for buyer fit, features, pricing, strengths, limitations, disagreements, and citations. Platform mentions count only ranking-discovery mentions and do not reflect how many platforms later completed a fit assessment. Citations are platform-reported evidence, not independently verified facts.

Research limitations

• The study used one standardized prompt sent once to each included platform. AI answers can vary by date, wording, location, account state, model, interface, browsing configuration, and the sources retrieved.
• Platform-reported research dates differ from the authoritative run date. Deepseek reported dates ranging from 2026-01-15 to 2026-08-08 across entities; all other platforms reported 2026-10-01. These are provenance metadata and do not independently prove freshness.
• Platform recommendations are market intelligence, not independent customer reviews or proof of quality.
• The supplied URLs were collected from platform responses and were not independently validated by the writer stage.
• Company-owned citations materially outnumber independent citations for Solar Landscape and Greenskies Clean Energy; company claims should not be described as independently verified.
• The deterministic identity audit flagged unresolved identity and conflicting official domains for Teichert Solar, and failed official-site retrieval for one or more mentions across several entities.
• Deepseek operated without search enabled, so its claims require explicit verification before being described as current facts.
• No platform provided verified commercial pricing for any entity in this index.

The consensus assessment

Sunrun ranks first on platform mentions but carries the weakest evidence base of any entity in the index, with platforms split between describing an active commercial PPA/lease offering and describing a residential-only company limited to multifamily housing. Freedom Solar Power is the most consistently supported option for owner-occupied commercial buildings, with six of seven assessing platforms rating it "good" and documented commercial projects from 14 kW to 1.97 MW. Solar Landscape is the strongest specialist for large-roof property owners seeking zero-CapEx rooftop leasing, despite a 40,000 square foot threshold that excludes many small businesses. Greenskies Clean Energy suits buyers wanting developer-owned PPAs with combined roof-and-solar financing, subject to an unverified $1 million financing floor. StraightUp Solar is the best regional option in Illinois and Missouri. Teichert Solar is the construction specialist for carports, ground mounts, and heavy civil work in California, but its identity as a distinct commercial solar business remains unverified. No entity in this index publishes standard commercial pricing, and no platform independently verified commercial installation quality or customer outcomes.

Frequently Asked Questions

Does Sunrun actually install commercial solar for small businesses? Platforms disagree. Grok described a commercial PPA/lease offering for 25–500 kW systems ^[121]. Google stated Sunrun's U.S. commercial operations are limited to multifamily residential developments and affordable housing, and that it does not design, install, or finance solar for standard commercial buildings ^[73]. OpenAI could not verify a current commercial division ^[17]. Buyers should request a written commercial proposal and verify the contracting entity before relying on Sunrun for a commercial project.

Which commercial solar installer is best for a small business that wants to own the system and claim the tax credit? None of the top-ranked PPA/lease providers is structured for that. Under PPA and lease structures, the provider typically owns the system and claims the credits ^[176]. Freedom Solar Power and StraightUp Solar both describe ownership financing paths, including cash purchase and commercial loans ^[162].

How much does commercial solar cost for a small business? No entity in this index publishes a standard commercial price. The only published figures in the evidence are company-published indicative ranges: Solar Landscape's $0.25–$0.85 per square foot per year rooftop lease rate ^[30], StraightUp Solar's $50,000–$1.5 million commercial loan range ^[41], and a $3–$5 per square foot commercial installation estimate reported by Gemini for Freedom Solar Power ^[70].

What is the minimum rooftop size for a commercial solar lease? Solar Landscape states the best candidates typically have at least 40,000 square feet of usable rooftop space, although each property is evaluated individually ^[28].

Do commercial solar PPAs include maintenance? Sunrun states that its lease/PPA arrangements include installation, maintenance, monitoring, and insurance for the agreement term ^[110]. Solar Landscape says it normally owns, operates, and maintains the system for the agreement term ^[28]. Greenskies Clean Energy describes an integrated development-to-operations model ^[100]. Whether the same service levels apply to commercial systems is unclear for Sunrun.

Which commercial solar installer serves Illinois and Missouri? StraightUp Solar is confirmed only in Illinois and Missouri ^[117]. It is an Approved Vendor under Illinois Solar for All and cites expertise in SRECs, smart inverter rebates, USDA REAP grants, and Missouri PACE financing ^[47].

What should a buyer verify before signing a commercial solar contract? Verify who owns the system and who receives each tax credit, depreciation, and renewable-energy certificate; the exact PPA rate or lease payment, escalator, term, and production guarantee; early termination, buyout, property-sale, and assignment provisions; roof, structural, and electrical upgrade responsibilities; construction schedule and outage plan; and warranty scope and claim procedures ^[176].

Sources used in this study

Company-Owned Sources

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2. Freedom Solar Power Commercial Portfolio: https://freedomsolarpower.com/commercial-portfolio
3. Commercial Solar Energy Power Projects: https://freedomsolarpower.com/commercial-portfolio/page/12
4. Commercial Solar Power Savings & Cost Calculator: https://freedomsolarpower.com/commercial-solar-calculator
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6. Solar Power FAQ: https://freedomsolarpower.com/faq
7. Freedom Power - Locations Page: https://freedomsolarpower.com/locations
8. Commercial Projects: https://freedomsolarpower.com/portfolio/commercial
9. Solar Financing - Freedom Solar Power: https://freedomsolarpower.com/solar-financing/
10. 25-Year Solar Panel Warranty on Performance & Workmanship: https://freedomsolarpower.com/warranty
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15. Sunrun Customer Agreement Disclosure: https://investors.sunrun.com/filings-financials/sec-filings/content/0001193125-24-215176/d851179dex991.htm
16. ABS-15G - 09/05/2025: https://investors.sunrun.com/filings-financials/sec-filings/content/0001193125-25-197301/0001193125-25-197301.pdf
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31. Commercial Rooftop Solar for Property Owners: https://solarlandscape.com/projects
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34. About StraightUp Solar - Illinois & Missouri Solar Provider: https://straightupsolar.com/about/
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41. Commercial Solar Incentives & Costs in Illinois and Missouri: https://straightupsolar.com/commercial/commercial-incentives/
42. StraightUp Solar Commercial Solar and Government Solar Services: https://straightupsolar.com/commercial/government/
43. Industrial Solar Installers: https://straightupsolar.com/commercial/industrial/
44. Solar for Small Business in Illinois and Missouri: https://straightupsolar.com/commercial/small-business/
45. Contact Us - Solar Provider & Installation in Missouri & Illinois: https://straightupsolar.com/contact-us/
46. StraightUp Solar Frequently Asked Questions: https://straightupsolar.com/faqs/
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48. Illinois Solar Net Metering Changes: https://straightupsolar.com/illinois-solar-net-metering-changes/
49. 30% Federal Investment Tax...: https://straightupsolar.com/illinois/
50. Solar Installation Company Serving Metro East St. Louis, Illinois: https://straightupsolar.com/metro-east-st-louis-il/
51. Solar Installation & Provider in Missouri: https://straightupsolar.com/missouri/
52. Solar Installation & Provider Service Areas in Missouri & Illinois: https://straightupsolar.com/service-areas/
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54. Solar for Small Business in Illinois and Missouri: https://straightupsolar.com/solar-for-small-business/
55. Solar Monitoring System Services: https://straightupsolar.com/solar-monitoring-services/
56. Small Business Solar in St. Louis: https://straightupsolar.com/st-louis-city-county/commercial-solar/small-business-solar/
57. Solar Service, Maintenance, and Warranties: https://straightupsolar.com/uncategorized/solar-service-maintenance-and-warranties/
58. Webinar: The Top 5 Questions to Ask Your Solar Installer: https://straightupsolar.com/webinar-top-5-questions-to-ask-your-solar-installer/
59. Teichert: https://teichert.com/
60. Build - Teichert: https://teichert.com/build/
61. Renewable Energy - Teichert: https://teichert.com/build/renewable-energy/
62. Company - Teichert: https://teichert.com/company/
63. Projects: https://teichert.com/company/all-projects/
64. Teichert | Corporate | Legacy: https://teichert.com/company/legacy/
65. Intuit Dome - Teichert: https://teichert.com/project/intuit-dome/
66. Projects - Teichert: https://teichert.com/projects/
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86. Commercial, Municipal and Utility Solar Solutions | Greenskies: https://www.greenskies.com/
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88. Greenskies Latest News Stories: https://www.greenskies.com/about/news
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93. Greenskies Official Website - Project Financing: https://www.greenskies.com/capabilities/project-financing
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95. Greenskies Clean Energy - Financing Options: https://www.greenskies.com/financing/
96. Real Estate Solar Solutions | Greenskies: https://www.greenskies.com/looking-for-solar/building-owners
97. Greenskies Official Website - Solar and New Roof: https://www.greenskies.com/looking-for-solar/solar-roof
98. Greenskies Clean Energy - Projects: https://www.greenskies.com/projects/
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100. Solar Project Financing | Greenskies: https://www.greenskies.com/services/project-financing
101. Corporate Solar Solutions | Greenskies: https://www.greenskies.com/solutions/corporate
102. Parking Lot Solar Canports & Canopies - Greenskies: https://www.greenskies.com/solutions/parking-lots
103. Real Estate Solar Solutions | Greenskies: https://www.greenskies.com/solutions/real-estate-owners
104. Small Utility Solar Solutions - Greenskies: https://www.greenskies.com/solutions/small-utility
105. Solar and New Roof Financing - Greenskies: https://www.greenskies.com/solutions/solar-and-new-roof
106. Solar and New Roof Financing | Greenskies: https://www.greenskies.com/solutions/solar-roof
107. Official pricing and terms source: https://www.sunrun.com
108. Sunrun Commercial Solar: https://www.sunrun.com/commercial-solar
109. Solar PPA vs Lease: What's the Difference?: https://www.sunrun.com/go-solar-center/solar-articles/whats-a-solar-lease-or-ppa
110. Battery Backup & Solar FAQs: Process, Cost, Install | Sunrun: https://www.sunrun.com/go-solar-center/solar-faq
111. Solar Battery Storage | Certified Installer | Sunrun: https://www.sunrun.com/solar-battery-storage
112. Sunrun Solar for Business: https://www.sunrun.com/solar-for-business
113. Official pricing and terms source: https://www.sunrun.com/solar-plans-and-services
114. Official pricing and terms source: https://www.sunrun.com/solar-plans-and-services/monthly-solar-lease

Independent Sources

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117. StraightUp Solar: 2026 Expert Review: https://bestcompany.com/solar/straightup-solar
118. Sunrun: 2026 Expert Review: https://bestcompany.com/solar/sunrun
119. Freedom Solar Power Careers, Perks + Culture - Built In: https://builtin.com/company/freedom-solar-power
120. Solar Landscape: https://climatebase.org/company/1133267/solar-landscape
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123. Tick Tock Energy, Inc.: https://exa.ai/library/organization/rsmx18z1pb7
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127. S-1: https://investors.sunrun.com/filings-financials/sec-filings/content/0001193125-15-234545/d880891ds1.htm
128. run-20241231: https://investors.sunrun.com/filings-financials/sec-filings/content/0001469367-25-000039/run-20241231.htm
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130. Petition by Greenskies Clean Energy LLC: https://portal.ct.gov/-/media/csc/3_petitions-medialibrary/petitions_medialibrary/mediapetitionnos1461-1470/pe1463/petitionersubmissions/petitionfiling/9742396_4.pdf
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142. Renewable Energy | Sustainability | Washington University in St. Louis: https://sustainability.wustl.edu/campus-initiatives/energy-emissions/renewable-energy/
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151. Freedom Solar Power LLC - Better Business Bureau Profile: https://www.bbb.org/us/fl/tampa/profile/solar-installation/freedom-solar-power-llc-0653-90431452
152. StraightUp Solar BBB Business Profile: https://www.bbb.org/us/il/bloomington/profile/solar-energy-contractors/straightup-solar-0724-1000010023
153. StraightUp Solar | BBB Business Profile: https://www.bbb.org/us/il/bloomington/profile/solar-energy-contractors/straightupsolar-0724-1000010023
154. StraightUp Solar BBB Complaints: https://www.bbb.org/us/mo/saint-louis/profile/solar-energy-contractors/straightup-solar-0734-310282536/complaints
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158. Freedom Solar Power | BBB Reviews: https://www.bbb.org/us/tx/austin/profile/solar-energy-design/freedom-solar-power-0825-90024387/customer-reviews
159. Freedom Solar Power | BBB Business Profile: https://www.bbb.org/us/tx/irving/profile/solar-energy-contractors/freedom-solar-power-0875-91053781
160. Solar Landscape Secures $600 Million Debt Facility to Accelerate Distributed Energy Deployment at Scale: https://www.businesswire.com/news/home/20260506902223/en/Solar-Landscape-Secures-$600-Million-Debt-Facility-to-Accelerate-Distributed-Energy-Deployment-at-Scale
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172. Freedom Solar Power for Commercial - EnergySage: https://www.energysage.com/supplier/27037/freedom-solar-power-for-commercial/
173. Solar Pro NY - Profile & Reviews - 2026 | EnergySage: https://www.energysage.com/supplier/28118/solar-pro-ny/
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175. How This Solar Company Pulled in Nearly $850 Million This Year: https://www.inc.com/chloe-aiello/how-this-solar-company-pulled-in-nearly-850-million-this-year/91062640
176. Clean Electricity Investment Credit: https://www.irs.gov/credits-deductions/clean-electricity-investment-credit
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179. Freedom Solar Power - LinkedIn Company Profile: https://www.linkedin.com/company/freedom-solar
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181. Solar FAQ | Lunex Power: https://www.lunexpower.com/about-us/faq
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183. PGIM Establishes a $175M PGIM Private Shelf Facility for Solar...: https://www.prudentialprivatecapital.com/perspectives/pgim-establishes-a-175m-pgim-private-shelf-facility-for-solar-landscapes-commercial-rooftop-solar-projects
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186. Sunrun Inc. - Form 10-K - FY2023: https://www.sec.gov/Archives/edgar/data/1469367/000146936724000024/run-20231231.htm
187. Sunrun Inc. - Form 10-K - FY2024: https://www.sec.gov/Archives/edgar/data/1469367/000146936725000039/run-20241231.htm
188. 36 Top Commercial Solar Contractors in 2025: https://www.siteline.com/blog/top-commercial-solar-contractors
189. Freedom Solar Power Launches First Commercial Solar Financing - Solar Power World: https://www.solarpowerworldonline.com/2018/11/freedom-solar-power-first-commercial-solar-financing-option-texas/
190. 2025 Top Commercial Solar Contractors: https://www.solarpowerworldonline.com/2025-top-commercial-solar-contractors/
191. Freedom Power taps Otovo for warranty service on commercial solar project portfolio: https://www.solarpowerworldonline.com/2026/02/freedom-power-taps-otovo-for-warranty-service-on-commercial-solar-project-portfolio/
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193. Solar Landscape: https://www.solarpowerworldonline.com/suppliers/solar-landscape/
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196. StraightUp Solar solar reviews, complaints, address & solar panels cost: https://www.solarreviews.com/installers/straightup-solar-reviews
197. Why now is a critical moment for St. Louis businesses to consider solar: https://www.stlmag.com/branded-content/straightup-solar-business-solar-incentives/
198. How to Evaluate Sunrun Solar Lease Costs for Your Business: A Practical Checklist for Office Administrators: https://www.sunrunus.com/blog/how-to-evaluate-sunrun-solar-lease-costs-for-your-business-a-practical-100.html
199. Freedom Solar Power Review (2026): https://www.thisoldhouse.com/solar-alternative-energy/freedom-solar-review
200. Freedom Power - Yelp Austin Location: https://www.yelp.com/biz/freedom-power-austin-2
201. Freedom Power - Yelp Houston Location: https://www.yelp.com/biz/freedom-power-houston
202. Freedom Solar Power - ZoomInfo Company Profile: https://www.zoominfo.com/c/freedom-solar-power-llc/348859013

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