Compare Local Pros
Clean Solar vs Core Energy
Santa Clara Solar Contractors Comparison · Updated March 2026
Clean Solar brings 18 years of experience and extensive customer feedback, while Core Energy has 7 years licensed but lacks visible customer reviews.
| Clean Solar | Core Energy | |
|---|---|---|
| Rating | ★ 4.5 | ★ 1.0 |
| Years Licensed | 18 years | 7 years |
| License # | 910849 | 1042269 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | San Jose, CA | San Jose, CA |
| Website | www.cleansolar.com | coreenergy.io |
Key Differences
What Customers Say
Clean Solar
Customers consistently praise Clean Solar's thorough consultations, patient technical explanations, and responsive communication throughout projects, with many returning for system expansions.
Key Takeaway: Clean Solar has extensive documented customer feedback revealing their service approach, while Core Energy lacks sufficient review data to assess actual customer experience patterns.
Customer Reviews
Clean Solar
Support group was very resonsive to my questions within hours. Great to have knowegeable help when it's needed.
Project: add whole-house battery backup to a 20 year-old home with existing solar PV system. I had three goals: 1. Load shifting (provide electricity during peak energy charges) 2. Provide backup pow...
My husband and I had a terrific and lengthy phone experience where Art explained in depth about solar panels and batteries. He was patient in answering all our questions and very generous with his t...
Core Energy
No reviews available
Consider Clean Solar if...
- ✓ You're installing a Tesla Powerwall or whole-house battery backup system where integration complexity benefits from extensive experience with these specific technologies
- ✓ Your project involves roof work combined with solar installation, requiring coordination between trades that Clean Solar has demonstrated handling successfully
- ✓ You value detailed customer education and patient explanations during the sales process, based on consistent feedback about their consultative approach
- ✓ You want visibility into how a contractor actually operates through extensive customer feedback before committing to a major investment
Consider Core Energy if...
- ✓ You've conducted independent reference checks and spoken directly with Core Energy's recent customers who can describe their actual experience
- ✓ You've received a particularly competitive bid and have verified their work quality through channels beyond online reviews
- ✓ You're comfortable making decisions with limited publicly available customer feedback and have done thorough due diligence through other means
- ✓ You have a straightforward solar panel installation without complex battery integration or roofing components
Questions to Ask Before Hiring
- → Ask Core Energy for at least three references from projects completed in the past six months and actually call them to discuss communication, timeline adherence, and problem-solving
- → Ask Core Energy how long their current installation crew has worked together and what their process is for handling unexpected complications during installation
- → Ask both companies about their specific experience with your roof type and any electrical panel upgrades that might be needed
- → Ask for detailed timelines including permitting, inspection scheduling, and what happens if approval delays occur
The Bottom Line
Clean Solar is the clearer choice for most homeowners due to their 18-year track record, extensive customer feedback demonstrating strong communication and technical expertise, and proven experience with complex battery backup systems. The veteran-level experience matters when complications arise during installation, and the consistent customer praise for their patient, educational approach reduces the risk of miscommunication or unmet expectations. Core Energy may be viable if you can thoroughly vet them through direct reference checks and they provide competitive pricing, but their limited review visibility requires significantly more due diligence on your part. If you're installing battery backup or combining solar with roofing work, Clean Solar's documented experience with these complex projects makes them the safer bet.
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Frequently Asked Questions
The 18-year track record means Clean Solar has handled complications you won't anticipate until they arise during your project—roof structure issues, complex electrical integration, permit rejections. Their customer feedback shows they explain problems clearly and solve them without conflict. That experience has tangible value when a $20,000+ investment goes on your roof for 25 years.
This could mean several things: they may be a smaller operation completing fewer projects, their customers may not leave online reviews, or they may focus on commercial work rather than residential. You should ask them directly how many residential installations they complete annually and request a full reference list from recent projects.
Clean Solar has documented customer feedback specifically mentioning Tesla Powerwall and whole-house battery backup installations, showing demonstrated experience with these complex integrations. Core Energy's project types list only mentions solar panel installation without battery systems noted, so you should specifically ask about their battery backup experience and request references from similar projects.
Clean Solar has navigated nearly two decades of changing building codes, utility interconnection requirements, and local permit processes in Santa Clara County. This institutional knowledge helps avoid permit rejections and inspection failures that delay project completion. Core Energy's 7 years is still substantial, but you should ask specifically about their permit approval rate and average timeline from contract to final inspection.
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See our ranked list of top solar contractors in Santa Clara.
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How We Compare Contractors
License Verification
All license data is sourced from official California CSLB records and verified regularly.
Review Analysis
Customer reviews are aggregated from Google and analyzed to identify patterns in service quality.
Detailed Comparison
We analyze credentials, insurance, experience, and feedback to highlight meaningful differences.
Not all licensed contractors are created equal. While a valid license is the baseline requirement in California, contractors can vary significantly in experience, insurance coverage, and customer satisfaction.
- Experience matters: A contractor with 15+ years of experience has likely encountered and solved problems that newer contractors haven't faced yet.
- Workers' compensation protects you: If a contractor without workers' comp insurance has an employee injured on your property, you could be held liable.
- Reviews reveal patterns: Individual reviews can be misleading, but patterns across many reviews often reveal a contractor's true strengths and weaknesses.
- Bond amounts vary: A contractor's bond provides financial protection if they fail to complete work as agreed. Higher bonds offer more protection.
Taking time to compare contractors on these factors can save you from costly mistakes and help ensure your project is completed by a qualified professional.
Data Sources: License information from California CSLB. Ratings and reviews from Google. Last verified March 12, 2026.
This comparison is based on publicly available information. We recommend getting multiple quotes and verifying all credentials directly before hiring.
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