Best solar companies California Santa Clara County Cupertino
Every company below has verified installations at Cupertino addresses in public utility records. Review scores are computed from every published customer review. Public data, not paid placement.
What this data covers: counts come from investor-owned-utility interconnection records for Cupertino service addresses. Homes served by municipal utilities interconnect through their city utility instead and do not appear here. Companies with fewer than 10 recorded Cupertino installs are not listed; many also build across Santa Clara County and beyond. See the full Santa Clara County ranking →
| # | Installer | |||||||
|---|---|---|---|---|---|---|---|---|
| 1 | Tesla Energy | 84 | 796 | 2007 | 9.5% | 6.8 | Get a direct bid | |
| 2 | Citadel Roofing And Solar | 69 | 93 | 2021 | 0.0% | 7.6 | Get a direct bid | |
| 3 | Sunrun | 49 | 162 | 2015 | 75.9% | 6.6 | Get a direct bid | |
| 4 | Sunrun Installation Services | 37 | 238 | 2014 | 61.8% | Not yet scored | Get a direct bid | |
| 5 | Cinnamon Energy Systems | 25 | 63 | 2017 | 0.0% | 8.1 | Get a direct bid | |
| 6 | Infinium Solar | 18 | 35 | 2019 | 0.0% | 8.1 | Get a direct bid | |
| 7 | Your Energy Solutions | 12 | 57 | 2019 | 0.0% | Not yet scored | Get a direct bid | |
| 8 | Solar Optimum Design & Electrical | 10 | 65 | 2020 | 0.0% | Not yet scored | Get a direct bid | |
| 9 | Nrg Clean Power | 10 | 43 | 2019 | 0.0% | 6.7 | Get a direct bid | |
| 10 | Sunvault | 9 | 32 | 2019 | 0.0% | Not yet scored | Get a direct bid | |
| 11 | Complete Solar | 9 | 13 | 2015 | 0.0% | Not yet scored | Get a direct bid | |
| 12 | Clean Solar | 8 | 73 | 2010 | 0.0% | 8.1 | Get a direct bid | |
| 13 | Cobalt Power Systems | 7 | 81 | 2004 | 0.0% | 6.7 | Get a direct bid | |
| 14 | Semper Solaris | 6 | 48 | 2015 | 0.0% | 7.7 | Get a direct bid | |
| 15 | Rockin Roofers | 6 | 14 | 2019 | 0.0% | Not yet scored | Get a direct bid | |
| 16 | Soleeva Energy | 6 | 13 | 2020 | 0.0% | Not yet scored | Get a direct bid | |
| 17 | Sunwork Renewable Energy Projects | 5 | 47 | 2012 | 0.0% | Not yet scored | Get a direct bid | |
| 18 | Nexus Energy Systems | 5 | 25 | 2016 | 16.0% | Not yet scored | Get a direct bid | |
| 19 | Freedom Forever | 5 | 22 | 2018 | 36.4% | 6.9 | Get a direct bid | |
| 20 | Earth Electric Incorporated | 5 | 18 | 2020 | 0.0% | Not yet scored | Get a direct bid |
Solar.com Scores are live for 22 of the 49 ranked companies. Companies marked “Not yet scored” have fewer than 20published reviews 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); it is separate from the install ranking and never for sale.
The table ranks every established company with recorded Cupertino installs by recent activity in public utility interconnection records, and 22 of them carry Solar.com Scores computed from every published customer review. 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.
By recent 2025-26 installation activity recorded for Cupertino addresses in CPUC interconnection records, with all-time installs as the tiebreak. Review scores are shown alongside but never change the activity ranking, and no company can pay for placement.
Where a company clears the 20-review floor, its Solar.com Score summarizes every published customer review, 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.
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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.