Best solar companies California Santa Clara County Los Altos
Verified Los Altos installs, review-backed Solar.com Scores, and the broader county market in one place. Public data, not paid placement.
What this data covers: counts come from investor-owned-utility interconnection records for Los Altos service addresses. Homes served by municipal utilities interconnect through their city utility instead and do not appear here. Companies with fewer than 10 recorded local installs are not listed; many also build across Santa Clara County and beyond. See the full Santa Clara County ranking →
| # | Installer | |||||||
|---|---|---|---|---|---|---|---|---|
| 1 | Highlight Solar10 recent installs60 verifiedActive since 20150.0% leased | 10 | 60 | 2015 | 0.0% | 8.8 | Get a direct bid | |
| 2 | Nabu Energy6 recent installs19 verifiedActive since 20210.0% leased | 6 | 19 | 2021 | 0.0% | 8.7 | Get a direct bid | |
| 3 | Nationwide Sun3 recent installs10 verifiedActive since 20220.0% leased | 3 | 10 | 2022 | 0.0% | 8.7 | Get a direct bid | |
| 4 | Cinnamon Energy Systems22 recent installs80 verifiedActive since 20150.0% leased | 22 | 80 | 2015 | 0.0% | 8.7 | Get a direct bid | |
| 5 | Infinium Solar14 recent installs66 verifiedActive since 20190.0% leased | 14 | 66 | 2019 | 0.0% | 8.7 | Get a direct bid | |
| 6 | Sunwork Renewable Energy Projects3 recent installs42 verifiedActive since 20120.0% leased | 3 | 42 | 2012 | 0.0% | 8.6 | Get a direct bid | |
| 7 | Sunvault6 recent installs15 verifiedActive since 20210.0% leased | 6 | 15 | 2021 | 0.0% | 8.6 | Get a direct bid | |
| 8 | Allterra Solar0 recent installs10 verifiedActive since 20150.0% leased | 0 | 10 | 2015 | 0.0% | 8.6 | Get a direct bid | |
| 9 | Cobalt Power Systems48 recent installs502 verifiedActive since 20030.0% leased | 48 | 502 | 2003 | 0.0% | 8.5 | Get a direct bid | |
| 10 | Clean Solar11 recent installs141 verifiedActive since 20090.0% leased | 11 | 141 | 2009 | 0.0% | 8.5 | Get a direct bid | |
| 11 | Citadel Roofing And Solar4 recent installs25 verifiedActive since 20210.0% leased | 4 | 25 | 2021 | 0.0% | 8.4 | Get a direct bid | |
| 12 | Solar Technologies6 recent installs52 verifiedActive since 20070.0% leased | 6 | 52 | 2007 | 0.0% | 8.3 | Get a direct bid | |
| 13 | Your Energy Solutions7 recent installs45 verifiedActive since 20150.0% leased | 7 | 45 | 2015 | 0.0% | 8.3 | Get a direct bid | |
| 14 | Earth Electric Incorporated0 recent installs27 verifiedActive since 20130.0% leased | 0 | 27 | 2013 | 0.0% | 8.2 | Get a direct bid | |
| 15 | Freedom Green Construction1 recent installs26 verifiedActive since 20190.0% leased | 1 | 26 | 2019 | 0.0% | 8.2 | Get a direct bid | |
| 16 | Solar Optimum Design & Electrical3 recent installs41 verifiedActive since 20200.0% leased | 3 | 41 | 2020 | 0.0% | 8.2 | Get a direct bid | |
| 17 | Soleeva Energy4 recent installs14 verifiedActive since 20220.0% leased | 4 | 14 | 2022 | 0.0% | 7.8 | Get a direct bid | |
| 18 | Simply Solar10 recent installs30 verifiedActive since 20176.7% leased | 10 | 30 | 2017 | 6.7% | 7.7 | Get a direct bid | |
| 19 | Hooked On Solar4 recent installs13 verifiedActive since 20200.0% leased | 4 | 13 | 2020 | 0.0% | 7.5 | Get a direct bid | |
| 20 | Nrg Clean Power16 recent installs53 verifiedActive since 20160.0% leased | 16 | 53 | 2016 | 0.0% | 7.4 | Get a direct bid |
Solar.com Scores are live for 30 of the 46 listed companies. Companies marked “Not yet scored” have fewer than 20 analyzed review texts or are still being analyzed; scores appear as each company's full review record is processed. Select up to 4 companies to compare them category by category.
% leased counts systems recorded as third party owned, meaning a lease or power purchase agreement. The remainder are customer owned. Active installer counts include every company that filed an interconnection that year, down to small and occasional operations. Counts come from PG&E, SCE, and SDG&E interconnection records; homes served by municipal utilities like LADWP, SMUD, and city power departments interconnect through their local utility instead, so companies focused on those territories show fewer records here. The Solar.com Score is computed from the full text of each company's published customer reviews (star ratings and review counts sourced from Google and Yelp), plus verified public-record track record; it drives the default ranking for scored companies and is never for sale.
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The table ranks scored companies by Solar.com Score, computed from customer review evidence and verified track record; 30 companies in this city currently carry a score. Companies not yet scored remain visible below the scored cohort by recent Los Altos install activity. The best company for your home also depends on your roof, utility, and bid, which is why the same companies compete on price through solar.com.
Companies with enough review evidence are ranked by Solar.com Score. Not-yet-scored companies show a dash in the rank column and sit below them, ordered by recent 2025-26 installation activity recorded for Los Altos addresses in CPUC interconnection records. No company can pay for placement.
Where a company clears the 20 analyzed-review floor, its Solar.com Score summarizes substantive customer review texts, weighted by reviewer credibility and recency. Select companies in the table to compare their review scores category by category, from sales integrity to long-term support.
Run your address through solar.com. Vetted installers compete on one identical scope for your home, pricing is locked online, and the Best Price Guarantee backs the winning number in writing.
Methodology: Counts are residential PV interconnections in investor-owned-utility territory (PG&E, SCE, SDG&E) per CPUC Rule 21 public records through May 2026. Postal and name variants are merged. Municipal utility territory such as LADWP, Glendale, Pasadena, Burbank, Anaheim, and Riverside Public Utilities is not included in those CPUC counts. Counts show recorded installations, not quality ratings. Reported costs are self-reported on owned-system interconnections. No installer can pay for placement.
Who we are: Solar.com is a solar marketplace — we connect homeowners with installers and earn a fee when projects move forward. These rankings and scores are computed from public installation records and published customer reviews. No installer can pay for placement, and no installer — including those we work with — can pay to change a score.