15 Best Solar Companies in Walnut, CA (2024 Reviews)

We analyzed over 1500 solar companies in the nation,
and have selected the top 15 in Walnut based on:

  • Customer review scores
  • Service area for Walnut, CA
  • Company policies and services offered
  • Accreditations and certifications

Average Walnut homeowner saves $2,108/year with solar panels

By EcoWatch Local Advisors

Data Analysis: James Savino

Ranking Methodology: Karsten Neumeister

Updated May 20, 2024

Why you can trust EcoWatch

We work with a panel of solar experts to create unbiased reviews that empower you to make the right choice for your home. No other site has covered renewables as long as us, which means we have more data and insider information than other sites. Our rankings are never affected by revenue or partnerships.

Best Solar Companies in Walnut

Looking for the top solar companies in Walnut? Installing solar panels is an exciting home addition that many homeowners find rewarding for their wallets, communities and the planet. Solar panels aren't just good for the planet — your wallet will benefit too. After switching to solar power, you can save an average of $25,000 over 20 years, and this doesn't even include incentives.


In this article, we’ll help you find the best options in your area.To receive free quotes from the best solar companies in Walnut, you can click "get quote" below.

Best Regional Coverage

Momentum Solar

★★★★★
4.5
  • Great warranty coverage
  • Representatives are experts on local policies
  • Concierge service ensures steady communication
  • Slightly limited service offerings

Best for Leasing

Sunrun

★★★★★
4.0
  • Expansive service area
  • Many financing options
  • Some reported issues with customer service
  • Some reported issues with door-to-door sales

Best Social Impact

Palmetto Solar

★★★★★
4.0
  • Expansive service area
  • Makes charitable contributions
  • Certified B Corp
  • No leases or PPAs
  • Quality of installation may vary by location

EcoWatch Rankings for Solar Companies in Walnut

Best Local Installer
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EcoWatch Rating

3.0/5

SunPower by True Power Solar

  • Pros icon Reliable Customer Support
  • Pros icon Informative Resources
  • Pros icon Clear Pricing Policy
  • Pros icon Free Quotes
  • Con icon Limited information available on website

Services Offered

  • Service icon Cleaning and Maintenance
  • Service icon Panel Installation

Website: http://www.truepowersolar.com/
Address: 201 Clark Ave, Pomona, CA 91767
Phone: 7146768888
Outstanding Local Installer
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EcoWatch Rating

3.0/5

SunPower by Sun Solar-OC

  • Pros icon Clear Pricing Policy
  • Pros icon Reliable Customer Support
  • Pros icon Informative Resources
  • Con icon Limited information available on website

Services Offered

  • Service icon Panel Installation
  • Service icon Battery Storage
  • Service icon Consultation
  • Service icon Cleaning and Maintenance

Website: https://sunpowerbysunsolaroc.com/
Address: 4085 E La Palma Ave Suite B, Anaheim Hills, CA 92807
Phone: 9497349695
Outstanding Local Installer
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EcoWatch Rating

4.4/5

SunPower by Sea Bright Solar

  • Pros icon Informative Resources
  • Pros icon Reliable Customer Support
  • Pros icon Clear Pricing Policy
  • Pros icon Free Quotes
  • Pros icon Prompt Service Delivery
  • Con icon Limited information available on website

Services Offered

  • Service icon Panel Installation
  • Service icon Battery Storage
  • Service icon Financing Assistance
  • Service icon Consultation

Website: https://seabrightsolar.com/
Address: 1785 Industrial Park Ave Building A, Redlands, CA 92374
Phone: 9093475451
Outstanding Local Installer
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EcoWatch Rating

3.0/5

Precis Solar

  • Pros icon Prompt Service Delivery
  • Pros icon Informative Resources
  • Pros icon Free Quotes
  • Pros icon Clear Pricing Policy
  • Pros icon Reliable Customer Support
  • Con icon Limited information available on website

Services Offered

  • Service icon Consultation
  • Service icon Panel Installation
  • Service icon Financing Assistance
  • Service icon Battery Storage
  • Service icon Permit Assistance

Website: http://www.precissolar.com/
Address: 36625 Kevin Rd STE 147, Wildomar, CA 92595
Phone: 9514762975
Outstanding Local Installer
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EcoWatch Rating

5.0/5

SunGuide Solar Inc

  • Pros icon Reliable Customer Support
  • Pros icon Informative Resources
  • Pros icon Free Quotes
  • Pros icon Clear Pricing Policy
  • Con icon Limited information available on website

Services Offered

  • Service icon Consultation
  • Service icon Panel Installation

Website: http://www.mysunguide.com/
Address: 1057 E Imperial Hwy #307, Placentia, CA 92870
Phone: 6269414181
Outstanding Local Installer
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EcoWatch Rating

4.6/5

Simple Solar

  • Pros icon Clear Pricing Policy
  • Pros icon Reliable Customer Support
  • Pros icon Free Quotes
  • Pros icon Informative Resources
  • Con icon Limited information available on website

Services Offered

  • Service icon Battery Storage
  • Service icon Consultation
  • Service icon Grid-Tied Solar System
  • Service icon Panel Installation
  • Service icon Cleaning and Maintenance
  • Service icon Permit Assistance
  • Service icon Financing Assistance

Website: https://www.simplesolar.energy/
Address: 661 S Brea Canyon Rd Suite 1, Walnut, CA 91789
Phone: 8449070705
Outstanding Local Installer
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EcoWatch Rating

4.9/5

TENCO SOLAR

  • Pros icon Informative Resources
  • Pros icon Free Quotes
  • Pros icon Clear Pricing Policy
  • Pros icon Reliable Customer Support
  • Con icon Limited information available on website

Services Offered

  • Service icon Battery Storage
  • Service icon Cleaning and Maintenance
  • Service icon Skilled Repairs
  • Service icon Consultation
  • Service icon Panel Installation
  • Service icon Financing Assistance
  • Service icon Permit Assistance
  • Service icon Solar Carports
  • Service icon System Decommissioning

Website: https://tencosolar.net/
Address: 700 N Valley St Suite C, Anaheim, CA 92801
Phone: 8885076937
Outstanding Local Installer
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EcoWatch Rating

4.6/5

Semper Solaris

  • Pros icon Informative Resources
  • Pros icon Clear Pricing Policy
  • Pros icon Reliable Customer Support
  • Con icon Limited information available on website

Services Offered

  • Service icon Consultation
  • Service icon Financing Assistance
  • Service icon Battery Storage
  • Service icon Panel Installation

Website: https://www.sempersolaris.com/locations/los-angeles/
Address: 10713 Norwalk Blvd, Santa Fe Springs, CA 90670
Phone: 2139844554
Outstanding Local Installer
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EcoWatch Rating

3.0/5

Clean Energy Solutions

  • Pros icon Informative Resources
  • Pros icon Free Quotes
  • Pros icon Clear Pricing Policy
  • Pros icon Reliable Customer Support
  • Con icon Limited information available on website

Services Offered

  • Service icon Consultation
  • Service icon Permit Assistance
  • Service icon Panel Installation

Website: http://cleanenergysolar.org/
Address: 417 W Allen Ave #105, San Dimas, CA 91773
Phone: 8009941134
Outstanding Local Installer
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EcoWatch Rating

4.6/5

Nexus Energy Systems

  • Pros icon Informative Resources
  • Pros icon Reliable Customer Support
  • Pros icon Clear Pricing Policy
  • Con icon Limited information available on website

Services Offered

  • Service icon Battery Storage
  • Service icon Panel Installation
  • Service icon Skilled Repairs
  • Service icon Cleaning and Maintenance
  • Service icon Tesla Powerwall

Website: http://nexussolar.net/
Address: 2530 E Cerritos Ave, Anaheim, CA 92806
Phone: 8052433345
Outstanding Local Installer
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EcoWatch Rating

3.0/5

West Covina Solar

  • Pros icon Prompt Service Delivery
  • Pros icon Informative Resources
  • Pros icon Reliable Customer Support
  • Pros icon Clear Pricing Policy
  • Pros icon Free Quotes
  • Con icon Limited information available on website

Services Offered

  • Service icon Consultation
  • Service icon Permit Assistance
  • Service icon Panel Installation

Website: http://westcovinasolar.com/
Address: 1338 Center Ct Dr #109, Covina, CA 91724
Phone: 6264046722
Outstanding Local Installer
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EcoWatch Rating

4.5/5

Go Green Solar

  • Pros icon Free Quotes
  • Pros icon Reliable Customer Support
  • Pros icon Informative Resources
  • Pros icon Clear Pricing Policy
  • Con icon Limited information available on website

Services Offered

  • Service icon Consultation
  • Service icon Panel Installation
  • Service icon Battery Storage
  • Service icon Cleaning and Maintenance
  • Service icon Permit Assistance
  • Service icon Off-Grid Solar Systems
  • Service icon Grid-Tied Solar System
  • Service icon Financing Assistance

Website: https://www.gogreensolar.com/
Address: 1630 S Sunkist St ste e, Anaheim, CA 92806
Phone: 8667984435
Outstanding Local Installer
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EcoWatch Rating

4.2/5

Better Earth Solar

  • Pros icon Free Quotes
  • Pros icon Prompt Service Delivery
  • Pros icon Informative Resources
  • Pros icon Reliable Customer Support
  • Pros icon Clear Pricing Policy
  • Con icon Limited information available on website

Services Offered

  • Service icon Battery Storage
  • Service icon Consultation
  • Service icon Permit Assistance
  • Service icon Panel Installation

Website: http://betterearth.solar/
Address: 16720 Marquardt Ave, Cerritos, CA 90703
Phone: 8883739379
Outstanding Local Installer
ecowatch badge icon

EcoWatch Rating

4.6/5

Infinity Solar

  • Pros icon Reliable Customer Support
  • Pros icon Clear Pricing Policy
  • Pros icon Free Quotes
  • Pros icon Informative Resources
  • Con icon Limited information available on website

Services Offered

  • Service icon Consultation
  • Service icon Tesla Powerwall
  • Service icon Panel Installation
  • Service icon Financing Assistance
  • Service icon Battery Storage
  • Service icon Permit Assistance

Website: https://www.infinitysolar.net/
Address: 749 N Main St, Orange, CA 92868
Phone: 7148808089
Outstanding Local Installer
ecowatch badge icon

EcoWatch Rating

3.0/5

SolarMax Technology

  • Pros icon Informative Resources
  • Pros icon Reliable Customer Support
  • Pros icon Clear Pricing Policy
  • Pros icon Free Quotes
  • Con icon Limited information available on website

Services Offered

  • Service icon Panel Installation
  • Service icon Financing Assistance
  • Service icon Battery Storage
  • Service icon Permit Assistance
  • Service icon Consultation

Website: https://www.solarmaxtech.com/
Address: 3230 Fallow Field Dr, Diamond Bar, CA 91765
Phone: 9092459952

Methodology: How We Ranked the Best Solar Companies in Walnut

EcoWatch's solar experts analyzed each solar company in Walnut based on criteria such as its reputation in the industry, customer reviews, services, warranty coverage and financing. Using this solar methodology, we used the data we collected to rate and rank each company and narrow down our picks for the best solar companies in Walnut


Below are some the criteria we examined specifically for California solar companies

  • Brand reputation and certifications (20%): We take each company's Better Business Bureau (BBB) score into consideration, as well as how long the installer has been in business (at least 5 years is required, 10 preferred) and what type of solar certifications it holds.
  • Customer reviews (20%): Trust is a top priority at EcoWatch, so we take customer experience under close consideration. We scour different review sites and customer testimonials when ranking our top solar companies, checking sites such as Trustpilot and Google Reviews. We also consider any potential complaints or lawsuits filed against these companies and award or remove points accordingly.
  • Warranty (20%): A company earns a perfect score in this category if it offers 25-year warranties that cover performance, product and workmanship. The industry standard that we measure companies against is 25-year product and performance warranties, along with a 10-year workmanship warranty. We also look closely into the track record of the post-installation support each company provides in terms of honoring its contracts
  • Solar services (10%): All of the companies we review install solar panels, but we award companies higher points if they offer additional services for customers, like battery installation, energy-efficiency audits, and EV chargers.
  • Pricing and financing (10%): It's hard to get exact quotes for solar projects, but we use marketplace research to determine how each company prices its equipment and installation services. Additionally, companies that offer more help for panel financing — like in-house loans, leases, or PPAs — score higher than those that don't.
  • Availability (10%): The bigger the service area, the higher the company will score.
  • Transparency and accessibility (5%): Solar installers that offer free consultations and easy contact methods score higher in this category.
  • Environmental, social and corporate governance factors (5%): A company earns a perfect score in this category if it offers public data disclosure, addresses end-of-life (EOL) products or processes, and demonstrates a commitment to uplifting the communities that it serves.

The Cost and Benefits of Solar in Walnut

Although solar panels can help save you money on energy bills over time, it’s necessary to take into consideration the upfront costs.The installation cost is just one important factor you should bear in mind when looking into getting solar panels. How much it'll cost and how much you can save depend on things such as:

  • Incentives: Something that can reduce the cost of your solar project is the solar investment tax credit (ITC), which is a tax credit that’s equal to a percentage of the project cost. You can also save money on your utility bills, which can lead to an average of $25,000 of savings over 20 years.
  • Choice of solar panels: The kind of solar panels you want will affect your total cost. High-efficiency monocrystalline panels will cost more upfront but can also save you more money over the lifetime of your system. If space isn't a constraint for your project, you can opt for a higher number of more affordable panels.
  • Energy consumption: Installing a solar system may be too pricey an option for families that don’t use too much energy a month.
  • Average daily sunlight: Since Walnut gets lots of sunlight, your solar panel system will most likely be able to produce enough energy to power your whole home, which affects how much your electricity bills will be.

So is a solar panel system worth it? Whether you hope to lower your electric bills, carbon dioxide emissions or both, solar panels are a solid investment for many Walnut homeowners.

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Solar Incentives in Walnut

There are several reasons why going solar is a great investment. One of them consists of some government incentives you can take advantage of.State and city solar incentive programs vary by location and, sometimes, utility company. Many states offer rebates for solar power systems, in addition to the federal solar tax credit. In our article on solar incentives, you can read about the incentives you qualify for near you.

Environmental Impact of Switching to Solar in Walnut

An important reason so many are considering going solar is to help reduce their environmental impact.A question many people might be thinking about is how much can they really help preserve the environment by switching to solar power anyway? Switching to clean energy for electricity in place of relying on nonrenewable energy sources is a good way to reduce carbon dioxide emissions if you want to help reduce Walnut's fair level of greenhouse gas emissions.In Walnut, the average person can lower their carbon footprint by 50 pounds a year once they go solar. Since energy from the sun is renewable and produces electricity without CO2 emissions, installing solar panels is one easy step you can take to help preserve the planet.

Best Regional Coverage

Momentum Solar

★★★★★
4.5
  • Great warranty coverage
  • Representatives are experts on local policies
  • Concierge service ensures steady communication
  • Slightly limited service offerings

Best for Leasing

Sunrun

★★★★★
4.0
  • Expansive service area
  • Many financing options
  • Some reported issues with customer service
  • Some reported issues with door-to-door sales

Best Social Impact

Palmetto Solar

★★★★★
4.0
  • Expansive service area
  • Makes charitable contributions
  • Certified B Corp
  • No leases or PPAs
  • Quality of installation may vary by location

EcoWatch's Walnut, CA Solar Company Rankings FAQs

Which solar company is the best near me?

In Walnut, SunPower by True Power Solar is the top local solar company. Our team of experts rates it 3.00 stars, so it's a good choice if you're planning on installing solar panels on your home.

What is the negative environmental impact of solar panel manufacturing?

Producing solar panels needs to use chemicals and produces toxic waste that can be harmful for the environment, which is the main drawback of solar panels.

Are solar panels worth it?

Solar panels need a large upfront investment that will cost you several thousands of dollars, but whether or not solar panels are worth it depends on a collection of factors like the cost of electricity near you and the amount of direct sunlight your roof gets.

When should I put up solar panels?

Although summer is the most popular time people install solar panels, the ideal time is actually winter. You can save money since there's not as much demand during the winter months, and it allows you to be up and running with solar for the more expensive power bills you may get during the summer.

Our goal is to reach as many people as we can with sensible solutions like solar energy. Our team of full-time local researchers collects solar price and installation data for every city in America then compiles it to create these digestible city guides. If you want to read our solar expert’s opinion on the top solar companies featured here, follow this link.

Company research was conducted by Melissa Smith and Karsten Neumeister. Local data analysis was conducted by James Savino. See something we missed or could do better? Email the editor.