234 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Alum Rock: EnergyAid, CR Score 64/100; 4.8★ from 842 Google reviews; open 24/7.
Best for emergencies (open 24/7): Smart Solar Panel Cleaning Bay Area, posts 24/7 hours; ranked #2 of 234.
Most-reviewed: Semper Solaris, 480 Google reviews at 4.6★, the most of 234 ranked after EnergyAid; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
234 Alum Rock solar installers are ranked here by CR Score, from ten published factors. 29 are open 24/7, 122 open Saturdays and 68 open Sundays, based on posted hours. The median Google rating is 4.9★ across 234 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | EnergyAid | 64 | 4.8★ (842) | Fremont, 12 mi away | 24/7 | Overall |
| 2 | Smart Solar Panel Cleaning Bay Area | 63 | 5.0★ (418) | Hayward, 25 mi away | 24/7 | Emergencies |
| 3 | TN Electrical and Solar Services | 62 | 5.0★ (107) | San Jose, 4 mi away | Sat · Sun | — |
| 4 | Sunrun Solar | 61 | 4.4★ (281) | Milpitas, 8 mi away | Sat · Sun | — |
| 5 | Semper Solaris | 60 | 4.6★ (480) | Hayward, 21 mi away | Sat · Sun · Evenings | Most reviews |
| 6 | California Solar Care | 60 | 5.0★ (54) | Fremont, 9 mi away | Sat · Sun | — |
| 7 | California Glass and Solar | 60 | 5.0★ (28) | Campbell, 10 mi away | 24/7 | — |
| 8 | Porter Solar Solutions | 59 | 5.0★ (205) | Campbell, 7 mi away | — | — |
| 9 | Infinium Solar Roofing and Electric | 59 | 4.9★ (290) | Campbell, 10 mi away | Sat · Sun · Evenings | — |
| 10 | Smart Solar Panel Cleaning San Jose | 59 | 5.0★ (11) | San Jose, 3 mi away | 24/7 | — |
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 review volume: 4.8★ from 842 Google reviews, the most in Alum Rock.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hayward, 25 mi away
Ranked #2 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 San Jose, 4 mi away
Ranked #3 because of its Google rating and trade focus: 5.0★ from 107 Google reviews, listed on Google as “Solar energy system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Milpitas, 8 mi away
Ranked #4 because of its Google rating and trade focus: 4.4★ from 281 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hayward, 21 mi away
Ranked #5 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 Fremont, 9 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 54 Google reviews, listed on Google as “Solar energy system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Campbell, 10 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 28 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Campbell, 7 mi away
Ranked #8 because of its Google rating and trade focus: 5.0★ 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 Campbell, 10 mi away
Ranked #9 because of its Google rating and review volume: 4.9★ from 290 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 3 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 11 Google reviews, listed on Google as “Solar panel maintenance service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 5 mi away
Ranked #11 because of its Google rating and trade focus: 4.8★ from 59 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 4 mi away
Ranked #12 because of its Google rating and trade focus: 4.6★ from 29 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Lafayette, 39 mi away
Ranked #13 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 Redwood Shores, 25 mi away
Ranked #14 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 Livermore, 23 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 Fremont, 16 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 63 Google reviews, listed on Google as “Solar energy company”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Dublin, 24 mi away
Ranked #17 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 San Jose, 5 mi away
Ranked #18 because of its Google rating and review volume: 4.9★ from 148 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 4 mi away
Ranked #19 because of its Google rating and trade focus: 4.2★ from 80 Google reviews, listed on Google as “Solar energy company”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Hayward, 25 mi away
Ranked #20 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 San Jose, 5 mi away
Ranked #21 because of its Google rating and trade focus: 4.8★ 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 San Jose, 9 mi away
Ranked #22 because of its Google rating and trade focus: 4.8★ from 98 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Livermore, 22 mi away
Ranked #23 because of its Google rating and trade focus: 4.9★ from 83 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 6 mi away
Ranked #24 because of its Google rating and trade focus: 4.4★ from 5 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Clara, 6 mi away
Ranked #25 because of its Google rating and trade focus: 4.5★ from 15 Google reviews, listed on Google as “Solar energy company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
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 234 Alum Rock 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 Alum Rock 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 |