Solar.com Score
Every published customer review of each company, read in full and scored 0-10 across six categories. Under 20 analyzed review texts: not yet scored. Never for sale. How scores work →
Best solar companies California Contra Costa County
Best solar companies in Contra Costa County (2026)
Scored installers are ranked by Solar.com Score. Not-yet-scored active companies remain listed below them by recent Contra Costa County installs, with public records beside every score.
89,151verified Contra Costa County systems
50established companies listed
$4.54/Wmedian reported cost, owned systemsSolar.com base price: $2.57/WMedian is self-reported installed cost on owned-system public interconnection records. Solar.com base price is a starting price before site-specific adders (roof complexity, electrical work, etc.); final quotes vary.
364installers active in 2025
Contra Costa County installers, ranked
Solar.com Score leads. Not-yet-scored active companies stay below by recent local installs.Every company with 250 or more verified Contra Costa County installs is included. Scored companies receive the numbered rank; unscored rows show a dash.
Install counts: Contra Costa County only
| # | Installer | |||||||
|---|---|---|---|---|---|---|---|---|
| 1 | Synergy Power55 recent installs328 verifiedActive since 20170.0% leased | 55 | 328 | 2017 | 0.0% | 8.9 | Get a direct bid | |
| 2 | Ambrose Solar117 recent installs643 verifiedActive since 20170.2% leased | 117 | 643 | 2017 | 0.2% | 8.8 | Get a direct bid | |
| 3 | Got Watts Electric & Solar259 recent installs868 verifiedActive since 20160.0% leased | 259 | 868 | 2016 | 0.0% | 8.8 | Get a direct bid | |
| 4 | Sol R Us Electrical59 recent installs692 verifiedActive since 20160.0% leased | 59 | 692 | 2016 | 0.0% | 8.7 | Get a direct bid | |
| 5 | West Coast Solar79 recent installs2,621 verifiedActive since 20091.6% leased | 79 | 2,621 | 2009 | 1.6% | 8.6 | Get a direct bid | |
| 6 | United Solar Electric74 recent installs317 verifiedActive since 20190.0% leased | 74 | 317 | 2019 | 0.0% | 8.4 | Get a direct bid | |
| 7 | Citadel Roofing And Solar737 recent installs2,605 verifiedActive since 20150.1% leased | 737 | 2,605 | 2015 | 0.1% | 8.4 | Get a direct bid | |
| 8 | Solar Technologies92 recent installs764 verifiedActive since 20070.0% leased | 92 | 764 | 2007 | 0.0% | 8.3 | Get a direct bid | |
| 9 | Your Energy Solutions127 recent installs1,256 verifiedActive since 20100.0% leased | 127 | 1,256 | 2010 | 0.0% | 8.3 | Get a direct bid | |
| 10 | Clear Day Energy53 recent installs845 verifiedActive since 20140.0% leased | 53 | 845 | 2014 | 0.0% | 8.2 | Get a direct bid | |
| 11 | Solar Optimum Design & Electrical88 recent installs535 verifiedActive since 20190.0% leased | 88 | 535 | 2019 | 0.0% | 8.2 | Get a direct bid | |
| 12 | Element Power Systems4 recent installs344 verifiedActive since 20110.3% leased | 4 | 344 | 2011 | 0.3% | 8.1 | Get a direct bid | |
| 13 | American Array Solar Electric53 recent installs703 verifiedActive since 20140.0% leased | 53 | 703 | 2014 | 0.0% | 8.0 | Get a direct bid | |
| 14 | Diablo Solar Services65 recent installs1,321 verifiedActive since 20030.0% leased | 65 | 1,321 | 2003 | 0.0% | 7.9 | Get a direct bid | |
| 15 | Sky Power Systems4 recent installs858 verifiedActive since 20020.1% leased | 4 | 858 | 2002 | 0.1% | 7.9 | Get a direct bid | |
| 16 | All On Electric33 recent installs519 verifiedActive since 20120.4% leased | 33 | 519 | 2012 | 0.4% | 7.8 | Get a direct bid | |
| 17 | Green Air Heating And Air Conditioning17 recent installs254 verifiedActive since 20090.0% leased | 17 | 254 | 2009 | 0.0% | 7.8 | Get a direct bid | |
| 18 | Grid Alternatives105 recent installs1,070 verifiedActive since 200753.0% leased | 105 | 1,070 | 2007 | 53.0% | 7.8 | Get a direct bid | |
| 19 | Simply Solar25 recent installs268 verifiedActive since 20141.1% leased | 25 | 268 | 2014 | 1.1% | 7.7 | Get a direct bid | |
| 20 | Synergy 7688 recent installs507 verifiedActive since 200814.8% leased | 8 | 507 | 2008 | 14.8% | 7.6 | Get a direct bid |
Solar.com Scores are live for 39 of the 50 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.
What this data covers: These counts come from PG&E interconnection records, the investor-owned utility service in Contra Costa County. Homes served by municipal or cooperative utilities interconnect through their local utility instead and do not appear in these records, so installers focused on those areas show fewer installs here than they actually build.
All install columns are Contra Costa County-specific. The county's 364 active installers in 2025 include smaller and occasional operations below the table floor. Acquired brands count under their current parent: SolarCity under Tesla Energy, Vivint Solar under Sunrun. No per-installer price is published in the table.
Recent installs
Contra Costa County installs recorded in 2025 and 2026. A big historical name with thin recent activity is a different signal than a company building every week.
Verified installs
Residential systems in Contra Costa County public records listing that company as installer of record, all time. Real local activity, not review stars.
% leased
The share of that company's Contra Costa County systems recorded as third party owned, a lease or power purchase agreement. Ownership mix, not quality.
% 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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Where solar.com fits in
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See your priceMedian installed price ($/W) - public records$4.54/W
Solar.com base price$2.57/W43% below median
How to read these pricesMedian is self-reported installed cost on owned-system public interconnection records. Solar.com base price is a starting price before site-specific adders (roof complexity, electrical work, etc.); final quotes vary.50established companies ranked in the county
Cities in Contra Costa County
6 city guides from the same public-record dataset.FAQ
Who has the best solar company reviews in Contra Costa County?
The Solar.com Score column ranks review evidence directly: we read the full text of every published customer review of the county's established installers and score what reviewers actually report, 0-10, across sales integrity, price transparency, communication, timeline reliability, workmanship, and after-install support. Sort the table by Solar.com Score or select companies to compare their reviews side by side.
Who is the best solar company in Contra Costa County?
The best company depends on your roof, utility, equipment needs, and whether you want to own the system or use a lease-style agreement. The table ranks scored installers by Solar.com Score, keeps unscored active companies below them, and shows verified Contra Costa County interconnection activity beside the score.
How are Contra Costa County installers ranked here?
The list includes every company with at least 250 verified Contra Costa County installs in CPUC Rule 21 public records through May 2026. Companies with a Solar.com Score are ranked by that score; companies not yet scored show a dash in the rank column and appear below the scored cohort, ordered by recent 2025-26 activity. Every install column is Contra Costa County-specific. Acquired brands are combined with their current parent, so SolarCity records count under Tesla Energy and Vivint Solar records count under Sunrun.
What does % leased (TPO) mean?
% leased (TPO) is the share of that installer's recorded systems that appear as third-party owned. It helps you see whether an installer historically skews toward owned systems, leases, or a mix.
How does solar.com pricing compare in Contra Costa County?
Contra Costa County has a median reported install cost of $4.54/W on owned-system CPUC records. Run your address through solar.com to see direct bids for your home, backed by the Best Price Guarantee.
Does being listed mean solar.com recommends that installer?
No. The public table reports verified installation volume only. The companies that bid on your home are separately vetted before they can compete through solar.com, and nobody can buy public placement here.
How we built this data
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.