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  • Written by
    Max Peterson
  • Fact Checked
  • Updated

Castro Valley homeowners are intentional about conserving resources and living sustainably. That's why many homeowners are purchasing panels from the best solar installers for their homes. 11,634 homes in the area already employ a solar photovoltaic or water heating system. Expert installers will therefore have the precise experience you need to embrace the solar bandwagon with confidence. Discover Castro Valley's best solar companies and learn important decision-making advice on this page.

Best Solar Panel Leasing
Sunrun logo
4.4/5

Ratings are based on our detailed proprietary methodology and review standards.

  • Provides system monitoring
  • Offers diverse financing options for various budgets
  • Provides EV and solar battery solutions
Best Solar Panel Installation
Momentum Solar logo
4.4/5

Ratings are based on our detailed proprietary methodology and review standards.

  • Offers 7 panel brand options
  • 25-year workmanship warranty
  • Offers battery options

10 Best Solar Companies in Castro Valley

Brands are algorithmically curated from a database of local service providers near you. We require a minimum number of Google reviews and average ratings for provider inclusion.

Featured Partner
SunPower Logo
Top Rated

SunPower

4.8/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 478 reviews


1414 Harbour Way S, Richmond, CA 94804

(510) 260-8200

us.sunpower.com
Solar Bill Review Logo

Solar Bill Review

4.7/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 102 reviews


11501 Dublin Blvd STE 200, Dublin, CA 94568

(925) 833-2641

solarbillreview.com
NorthStar Solar Inc Logo

NorthStar Solar Inc

4.7/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 29 reviews


822 Hartz Way STE 240, Danville, CA 94526

(925) 400-7479

www.gonorthstarsolar.com
Semper Solaris Logo

Semper Solaris

4.4/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 295 reviews


2505 Amaral Ct, Hayward, CA 94544

(650) 203-2589

www.sempersolaris.com/locations/bay-a...

Solar Technologies

4.4/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 38 reviews


14 Beta Ct, San Ramon, CA 94583

(925) 961-3756

solartechnologies.com

Complete Solar

4.3/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 356 reviews


3000 Executive Pkwy Suite 504, San Ramon, CA 94583

(877) 299-4943

www.completesolar.com

CivicSolar, Inc

4.5/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 90 reviews


304 12th St #3b, Oakland, CA 94607

(800) 409-2257

www.civicsolar.com
Source Energy Logo

Source Energy

4.7/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 31 reviews


161 N Civic Dr #400, Walnut Creek, CA 94596

(925) 319-6634

sourcenergy.solar
Infinity Energy Logo

Infinity Energy

3.6/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 36 reviews


1220 Quarry Ln Suite a, Pleasanton, CA 94566

(888) 244-2513

infinityenergy.com

GRID Alternatives

4.5/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 24 reviews


1171 Ocean Ave UNIT 200, Oakland, CA 94608

(510) 731-1310

www.gridalternatives.org

Ranking Methodology

We reviewed a multitude of Castro Valley solar companies, using the following criteria to determine the finest:

  • Panel brands and quality: The premier solar companies keep up with new technology, providing equipment from innovative, dependable manufacturers.
  • Reviews and feedback from customers: Most Castro Valley solar installers have both positive and critical reviews. However, a good review ratio reflects a company's dependability and responsiveness to issues.
  • Professional licenses and credentials: Each contractor on our list complies with state and city licensing requirements and keeps current with industry best practices. Many of them have served the Castro Valley community for over 15 years.
  • Warranty and service offerings: Solar installers should stand behind their equipment and services with warranties. We evaluated how each company responds to issues and warranty claims, focusing on timeliness and customer satisfaction.
  • Educational approach and support: Solar technicians must be knowledgeable. They should tap into their years of experience answer your questions on how to care for your system and improve its performance.

Facts about Castro Valley

  • Average Max Temperature:
    70°F
  • Solar Payback Period:
    7 years
  • Average Daily Sunlight:
    68%
  • Homes Powered by Solar:
    11,634
  • Average Annual Energy Bill:
    $1,538
  • Solar Power per Capita:
    93.1%

Benefits of Solar Energy

Solar energy comes with multiple benefits. Let's look at a few of them.

  • Lower energy bills: Sourcing some or all of your own power will spend less on electricity long-term. Plus, some states offer net metering programs that allow you to sell your surplus energy back to the grid, generating additional credits toward your energy bill.
  • Reduced carbon footprint: Utilizing solar is a surefire way to decrease your carbon footprint and home fossil fuel dependency.
  • Better energy independence: Solar panel systems can keep your home powered through blackouts and emergencies, giving you additional security. You can use your solar energy anytime with an optional battery backup system.

What Solar Incentives Are Available to Castro Valley Homeowners?

California homeowners who choose solar could qualify for tax credits, reimbursements, special financing and rebates. Here are just a few of the region's incentive programs.

Incentive Amount:

100% of system value; 75% of system value exemption for dual-use equipment

How To Choose the Best Solar Company in Castro Valley

The purchase price and efficiency of solar panels often depend on the solar company that installed them. Consider all of these criteria in your service provider search.

Licensing and Training

California requires solar companies to hold licenses for each type of equipment they install, which can include solar photovoltaic (PV) systems, pool heaters, boilers, HVAC, and water heaters. Contractors must complete a highly comprehensive educational series, gain four years of experience as an apprentice or journeyman, and pass written exams to secure a license. Check a company's website for private accreditations from the North American Board of Certified Energy Practitioners (NABCEP), one of the solar sector's most respected trade groups. Its program includes certifications for both solar photovoltaic and water heating installers.

Cost of Solar Panels in Castro Valley

The type of solar panels you purchase dictates how much power you can produce. Monocrystalline panels and high-quality and give you the best performance but cost more upfront. Polycrystalline panels produce less power, but they're worth it if you want a traditional panel style without the high cost. Thin-film panels aren't the best for large residential installations, but they are excellent accessories for non-traditional roofs.

If you need to charge an electric car or use your solar power in dark weather, you can pay extra for accessories. By choosing the right components, you can make your system more efficient and convenient to use. Not all solar contractors include these extras, so look for a company that installs them if it's important for you.

If you're a resident of Castro Valley and are considering getting a five-kilowatt solar energy system, you could expect to pay about $17,350 for parts and installation. See more information on specific component and solar panel costs in the table.

Solar Panel CostAverage Cost
Solar Monocrystalline$1,417.14
Solar Polycrystalline$1,105.37
Thin-Film$646.22
Solar Battery$906.97
Solar Home EV Charger$3,401.14

Financing Solar Energy in Castro Valley

There are various ways to pay for a solar energy system, and the right one will reduce your expenses. A few of the most common options include power purchase agreements (PPAs), cash payments, loans, and leases. We advise paying with cash or securing a solar loan for the best return on investment (ROI). Cash payments require a hefty sum up-front, but you’ll pay the least long-term by avoiding interest. You’ll also own your system and can apply for solar panel incentives to reduce your total costs. Solar loans are another good option if you don’t want to make a big initial investment. You can pay for your system in monthly installments while still enjoying energy bill savings and solar incentives. However, you’ll pay more in total due to accruing interest. Solar leases let you use your panels for a set monthly rate, while PPAs let you pay only for the energy you use, similar to an electric bill. Both options disqualify you for solar incentives and don't grant you system ownership. Solar experts generally don't recommend them, but they might be suitable in some cases. Ask each business you're vetting about the payment plans it offers. A consultant can help you determine the optimal option for your financial situation.

The table below lists the average payback periods for different capacities of solar systems in Castro Valley.

The IRS allows you to claim a 26% federal tax credit for solar panels on total system costs, so long as you purchase it before 2032. Municipal authorities and utilities might also offer their own rebates, financing programs, and incentives that could save you more money.

Solar System CapacityEstimated Payback period
1 kW1.4 years
2 kW2.7 years
5 kW6.8 years
10 kW13.7 years

Frequently Asked Questions about Solar in Castro Valley

Sources

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