291 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Contra Costa Centre: Smart Solar Panel Cleaning Bay Area, CR Score 63/100; 5.0★ from 418 Google reviews; open 24/7.
Best for emergencies (open 24/7): East Bay Solar Cleaning LLC, posts 24/7 hours; ranked #2 of 291.
Most-reviewed: SunPower®, 1,576 Google reviews at 4.5★, the most of 291 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
291 Contra Costa Centre solar installers are ranked here by CR Score, from ten published factors. 34 are open 24/7, 151 open Saturdays and 83 open Sundays, based on posted hours. The median Google rating is 4.9★ across 291 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Smart Solar Panel Cleaning Bay Area | 63 | 5.0★ (418) | Hayward, 20 mi away | 24/7 | Overall |
| 2 | East Bay Solar Cleaning LLC | 63 | 5.0★ (104) | Lafayette, 4 mi away | 24/7 | Emergencies |
| 3 | SunPower® | 62 | 4.5★ (1,576) | Richmond, 16 mi away | Sat · Sun · Evenings | Most reviews |
| 4 | EnergyAid | 60 | 4.8★ (842) | Fremont, 29 mi away | 24/7 | — |
| 5 | Source Energy | 60 | 5.0★ (51) | Walnut Creek, 1 mi away | Sat · Sun | — |
| 6 | Semper Solaris | 60 | 4.6★ (135) | Concord, 5 mi away | Sat · Sun · Evenings | — |
| 7 | Solar Shine | 60 | 4.9★ (268) | Antioch, 23 mi away | Sat · Sun | — |
| 8 | Semper Solaris | 59 | 4.6★ (480) | Hayward, 22 mi away | Sat · Sun · Evenings | — |
| 9 | Solar Bill Review | 58 | 5.0★ (128) | Dublin, 17 mi away | Sat | — |
| 10 | Sunrun Solar | 58 | 4.8★ (472) | Petaluma, 40 mi away | Sat · Sun | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and trade focus: 5.0★ from 418 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Lafayette, 4 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 104 Google reviews, listed on Google as “Solar panel maintenance service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Richmond, 16 mi away
Ranked #3 because of its Google rating and review volume: 4.5★ from 1,576 Google reviews, the most in Contra Costa Centre.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Fremont, 29 mi away
Ranked #4 because of its Google rating and trade focus: 4.8★ from 842 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Walnut Creek, 1 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 51 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Concord, 5 mi away
Ranked #6 because of its Google rating and trade focus: 4.6★ from 135 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Antioch, 23 mi away
Ranked #7 because of its Google rating and trade focus: 4.9★ from 268 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hayward, 22 mi away
Ranked #8 because of its Google rating and trade focus: 4.6★ from 480 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Dublin, 17 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 128 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Petaluma, 40 mi away
Ranked #10 because of its Google rating and trade focus: 4.8★ from 472 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Redwood Shores, 23 mi away
Ranked #11 because of its Google rating and trade focus: 4.7★ from 55 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Brentwood, 20 mi away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 70 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Walnut Creek, 2 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 31 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Vacaville, 33 mi away
Ranked #14 because of its Google rating and review volume: 4.9★ from 1,388 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Livermore, 22 mi away
Ranked #15 because of its Google rating and trade focus: 4.5★ from 172 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hayward, 20 mi away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 126 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oakley, 24 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 118 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Berkeley, 13 mi away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 45 Google reviews, listed on Google as “Solar energy system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Benicia, 18 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Francisco, 21 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 38 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Dublin, 19 mi away
Ranked #21 because of its Google rating and trade focus: 4.9★ from 205 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Concord, 4 mi away
Ranked #22 because of its Google rating and trade focus: 4.8★ from 25 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Anselmo, 28 mi away
Ranked #23 because of its Google rating and review volume: 4.9★ from 762 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Walnut Creek, 1 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Solar energy company”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Concord, 4 mi away
Ranked #25 because of its Google rating and trade focus: 4.1★ from 142 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 291 ranked solar installers here; the rest are on their profiles.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Smart Solar Panel Cleaning Bay Area | 56 | 5.0★ (44) | 12 mi |
| 27 | Singh Solar Couple | 56 | 5.0★ (18) | 4 mi |
| 28 | TN Electrical and Solar Services | 56 | 5.0★ (107) | 39 mi |
| 29 | Besty Solar Inc. | 56 | 5.0★ (63) | 26 mi |
| 30 | KOTA Energy Group | 56 | 4.1★ (94) | 5 mi |
| 31 | Sunrun Solar | 55 | 4.4★ (281) | 34 mi |
| 32 | California Solar Care | 55 | 5.0★ (54) | 33 mi |
| 33 | Sol R Us Inc | 55 | 4.8★ (32) | 2 mi |
| 34 | Kingdom Solar | 55 | 4.9★ (83) | 25 mi |
| 35 | Professional Powerwashing & Property Maintenance | 55 | 4.9★ (111) | 12 mi |
| 36 | North Valley Solar Power | 55 | 4.9★ (48) | 22 mi |
| 37 | Sunrun Solar | 55 | 4.0★ (115) | 18 mi |
| 38 | Sunrun Solar | 55 | 3.8★ (469) | 21 mi |
| 39 | Sky Power Solar | 55 | 4.4★ (14) | 11 mi |
| 40 | solarXperts | 55 | 4.3★ (102) | 4 mi |
| 41 | Sun Light & Power Solar | 55 | 4.8★ (73) | 14 mi |
| 42 | SolarGuru Energy | 55 | 5.0★ (3) | 12 mi |
| 43 | Gomax Solar System inc. | 55 | 5.0★ (17) | 11 mi |
| 44 | Ambrose Solar | 55 | 4.9★ (258) | 33 mi |
| 45 | Greiner Heating, Air and Electric | 55 | 5.0★ (1,451) | 40 mi |
| 46 | Total Solar Cleaning | 54 | 5.0★ (7) | 2 mi |
| 47 | Solar Harmonics | 54 | 5.0★ (68) | 19 mi |
| 48 | NorthStar Solar Inc | 54 | 4.7★ (50) | 8 mi |
| 49 | North Valley Solar Power | 54 | 4.9★ (15) | 12 mi |
| 50 | Mirador Energy | 54 | 5.0★ (15) | 22 mi |
20 more solar installers within 40 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Borrego (Oakland) | 4.0★ (2) | 14 mi |
| Castle Electrical Services | 5.0★ (2) | 23 mi |
| CITY SOLAR | 5.0★ (2) | 24 mi |
| Contra Costa Sun | 5.0★ (2) | 4 mi |
| Eagle Shield | 3.0★ (2) | 9 mi |
| Estrada Exterior Cleaning Corp | 5.0★ (2) | 23 mi |
| GHESolar Company San Francisco | 5.0★ (2) | 23 mi |
| GT Solar Power Concord | 5.0★ (2) | 3 mi |
| NationWize Solar | 1.5★ (2) | 10 mi |
| NC Electric & Solar Inc | 3.0★ (2) | 4 mi |
| New Dimension Roofing and Solar | 5.0★ (2) | 24 mi |
| Optivolt | 5.0★ (2) | 22 mi |
| Phils Electric Company | 5.0★ (2) | 14 mi |
| Solar Sense PV, Inc. | 1.0★ (2) | 18 mi |
| SolarPanal EranNSave Danville | 5.0★ (2) | 12 mi |
| Spartan Home Services | 5.0★ (2) | 9 mi |
| Triad Power Solutions | 5.0★ (2) | 17 mi |
| Universe Solar Panel Oakland | 3.0★ (2) | 14 mi |
| Vonnegut Electric & Solar | 5.0★ (2) | 16 mi |
| West Coast Solar & Water Heater Repair | 5.0★ (2) | 15 mi |
Typical prices in USD, adjusted for California with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Solar panel installation | $29,770 | $33,680 | $36,640 | Per system: about 12 kW at about $2.60 per watt, before incentives. US national range × 1.08 Pacific factor (2025 Cost vs. Value Report) | October 2026 |
We scored 291 Contra Costa Centre solar installers on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Contra Costa Centre data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |