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TRUSTED BY CASTRO VALLEY, CA HOMEOWNERS

  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon40
    Verified solar panel services reviews

Top-Rated Solar panel pros in Castro Valley - Updated Nov 2026

Avatar for ELLISON ELECTRIC AND SOLAR INC
ELLISON ELECTRIC AND SOLAR INC
5.0(
6
)
Solar Panel InstallSolar Panels For Electric System - Install - For Business

Serving Castro Valley, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2024

Free estimates

Emergency services offered

"I recently had the pleasure of working with Ken at Ellison Electrical on a service panel upgrade for my electrical vehicle and completely rewired my new kitchen. Ken was incredibly patient, explaining every step of the process. He immediately understood the floor plan and installed everything to code. His attention to detail and knowledge was exceptional. The quality of his work is evident in every connection and fixture. The service panel upgrade was seamless, my kitchen looks amazing and now my home feels more secure and efficient. He was always punctual, respectful of my property. I highly recommend Ellison Electrical for any electrical project."
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+3

Response time2 days
Response rate100%
1 neighbors recently requested a quote
Avatar for NRG Clean Power
NRG Clean Power
4.6(
52
)
Solar Panel Install

Serving Castro Valley, CA and surrounding areas

Approved (Corporate)

In business since 1996

Free estimates

Warranties offered

"Roberto Sanchez Solar System, I interviewed 4 solar panel companies and I chose NRG because Will was able to explain everything well. He answered all my questions to my complete satisfaction. Friendly and honest, Will made the sales process very smooth and personable. Tiffany helped and coordinated the project to make sure everything goes well. She always got back to my emails and phone calls promptly. Installers completed the solar panels when I was at work. Came home and he solar panels were on the roof. Definitely a nice install and quality work was delivered. Lisa helped out with the financing on the HVAC. She was patient and I believe got me a lower amount that before. Solar edge app is great to use and straight forward. Highly recommended company thanks NRG. I am excited to use my new solar system!"
Rooftop Solar
Solar Installation
Solar Panel Install
Home Solar Install
Solar System Install

+5

16 neighbors recently requested a quote
Recommended by77%of homeowners
Avatar for SOLARSESAME INC
SOLARSESAME INC
5.0(
6
)
Solar Panel Install

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2022

Free estimates

Emergency services offered

"I had a wonderful experience with Solar Sesame. My salesperson Emanuel was professional, courteous and truly awesome to work with... Thank you guys so much..."
11.21 kW, Shingle Roof
11.21 kW, Shingle Roof
11.21 kW, Shingle Roof
Solar Panel Install
Solar Panel Install

+20

Response time5 hrs
Response rate100%
30 neighbors recently requested a quote
Avatar for Power On Solar
Power On Solar
4.6(
5
)
Solar Panel Install

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2016

Free estimates

We specialize in all your home solar panel and battery installs. We pride ourselves on the quality work we provide, while delivering great customer service! Check out our home solar offerings below and call -or- click to schedule a free estimate today.

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+1

23 neighbors recently requested a quote
Avatar for Soltari
Soltari
5.0(
3
)
Solar Panel InstallSolar Panels For Electric System - Install - For Business

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"I had Soltari install my solar panels and I’m really happy with how everything turned out. I was a little nervous going into it since I didn’t know much about the process, but they made it super easy to understand and handled everything. The team was professional, respectful, and just really easy to work with. They showed up when they said they would and made sure everything was done right. Now that it’s all up and running, I’m honestly so glad I decided to go with them. I’d definitely recommend them to anyone looking into solar 😊"
Tesla Powerwall
Full Backup Power
Energy Storage
Smart Monitoring
Emergency Power

+3

Response time6 hrs
Response rate100%
5 neighbors recently requested a quote
Avatar for Atomic Telecomm & Electrical Inc.
Atomic Telecomm & Electrical Inc.
4.5(
9
)
Solar Panel InstallSolar Panels For Electric System - Install - For BusinessSolar Panels For Electric System - Repair+1 more

Serving Castro Valley, CA and surrounding areas

Approved

In business since 1990

Free estimates

Emergency services offered

"Our phone lines were not working inside of our business. Joe was very helpful and fit me in on a time sensitive issue, he was out the next day! He arrived when he said he would and went the extra mile in making sure we had everything fixed and working that we needed. I would recommend him to anyone needing phone line/jack work. Very friendly and professional."
Network Switch and Router
Driveway Camera
Backyard Camera's
Front Yard Camera
NW corner of house

+9

Response time1 day
Response rate85%
Recommended by87%of homeowners
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Solar Panels FAQs, answered by experts

The average cost to install solar panels is around $27,000, with most homeowners paying between $4,500 and $54,000. These prices don’t consider the federal investment tax credit (ITC), which can reduce costs by up to 30%. The final price depends on several factors, including the size of the system needed to offset your energy consumption, the amount of sunlight your home receives, your geographical location, the type and brand of panels, labor costs, and any add-on products like solar batteries or electric vehicle (EV) chargers. It is recommended to get price quotes from at least three solar companies in your area to find the best deal.

In most states, solar installers need to be licensed and insured as solar professionals, although some states don’t have specific requirements for installers. You can use our state licensing tool to check if an installer you’re considering hiring holds the proper licensing. No matter where you live, a member of your solar panel installation company must be a certified electrician to connect your panels to your home and the electric grid.

Solar water heating systems are not one-size-fits-all. You'll likely work with a team of experts to get the job done—including solar panel installers, plumbers, and water heater installers. A specialist will help you decide if a passive or active system is best for your local weather, home layout, roof stability, and your budget.

The time it takes to install solar panels depends on the number of panels and the size of your home, but installation takes between two and three days of work. While most contractors can install the panels over the course of a couple of days, switching to solar energy can take two to three months in total. This includes the time it takes to design the system, procure the parts, obtain the permits, install the panels, connect to the main power grid, and get an inspection.

  • Installing a new electrical meter box

  • Replacing your meter base

  • Replacing your service entrance cable 

The cost to install or upgrade an electrical meter box ranges from $100 to $650, including $50 to $250 for the unit. The meter base passes the power from your electric company to your panel. The cost to replace a meter base is roughly $50 to $250. 

Service entrance cables are electrical cables with multiple wires, bringing power from electrical companies to residential buildings. The cost to replace a service entrance cable ranges roughly from $1,000 to $1,500.

The Castro Valley, CA homeowners’ guide to solar panel services

From average costs to expert advice, get all the answers you need to get your job done.