Solar Companies in Contra Costa County, CA

Call 415-458-5870.

When a red flag warning goes up on a dry fall afternoon, a lot of homeowners in the hills above Concord and Antioch start watching for word of a Public Safety Power Shutoff. PG&E can switch off power lines during strong, dry winds to lower the chance of a fire, and a shutoff can leave a neighborhood dark for hours or even days. That's often the week people start looking at solar companies in Contra Costa County. Sun First Solar installs residential solar and battery storage across the county, from Walnut Creek and Danville out to Antioch and Brentwood. We design each system around your house, your roof and the way your family uses power, and we're happy to talk it through with you whenever you're ready.

Cities We Serve in Contra Costa County

Our crews work throughout Contra Costa County, in the older neighborhoods up against the hills and in the newer subdivisions out east. That includes Walnut Creek, Concord, Danville, San Ramon, Lafayette, Orinda, Martinez, Antioch and Brentwood, along with the smaller towns in between. Homeowners comparing solar companies in Walnut Creek, Concord or Danville get the same thing from us as people looking at solar companies in Antioch or Brentwood: a system designed for their own house and installed by our own Sun First team, start to finish.

Solar and Battery Storage, Built to Work Together

At Sun First Solar, we plan your solar panels for your home and your battery as one system, right from the first conversation. The panels make power during the day, the battery holds what you don't use, and your house draws on that stored energy in the evening or when the grid goes down. Sizing them side by side means the panels, the battery and your electrical equipment are matched from day one.

We're a certified Tesla Powerwall installer, and we also install the Enphase IQ Battery and Sonnen Eco, so you can choose from several battery storage options to fit how your home uses power. We installed our first off-grid solar and battery system back in 2004, and we've been installing them ever since. We take care of the design, the permits, the installation, the financing and getting everything connected to the grid.

Many of our clients make back the cost of their solar system within the first five to seven years. Our team will walk you through the tax credits and incentives your system may qualify for, and we offer flexible financing, whether you'd like to buy your system outright or spread the cost over a loan with manageable monthly payments.

Built for Contra Costa's Hills and Its Growing Valley Communities

Contra Costa County is home to more than 1.1 million people spread across about 700 square miles, and the homes here change a lot from one end of the county to the other. The state's updated fire hazard maps, released in 2025, show high fire hazard along the hillside edges of several cities, including Concord's Crystyl Ranch neighborhood, most of Antioch's Sand Creek area and Pittsburg's southwest hills. Those are the neighborhoods where a shutoff during red flag weather is a real possibility, so a battery that keeps your lights, your fridge and your internet running is a practical part of the plan.

Antioch, Brentwood and Oakley also have plenty of flatter ground and newer neighborhoods, with more homes still going up. Pairing solar with a battery on a newer house gives you control over your power bill from the start, along with the same backup your neighbors up in the hills are planning for.

More than half of the county's homes were built before 1980. A house from that era often has an electrical panel sized for a lighter load than today's air conditioning, EV chargers and batteries. We review your roof, your electrical panel and your backup goals while we design the system, and when an upgrade makes sense, we plan it in from the beginning.

Permits can move quickly here, too. The county's SolarAPP+ program lets qualifying rooftop systems in unincorporated Contra Costa County and in Lafayette, Orinda, Clayton, Moraga and Hercules get their building permit online, often within minutes. We handle the permit paperwork for you wherever you live in the county, so it's one less thing for you to keep track of.

Solar Independence, With or Without Community Choice Energy

Most of Contra Costa already has a say in where its electricity comes from. Fifteen of the county's nineteen cities and towns, along with the unincorporated areas, have joined MCE, the community choice energy program, starting with Richmond in 2013 and adding Walnut Creek, Lafayette, Concord, Danville, Martinez, San Ramon, Pittsburg, Oakley and others in the years since. Antioch, Brentwood, Clayton and Orinda have stayed on standard PG&E service.

Solar and battery storage give homeowners in any of these cities a way to make more of their own power and lean less on whoever supplies it. Homeowners in Antioch, Brentwood, Clayton and Orinda get the same kind of control over their energy that their MCE neighbors have, right from their own roof. MCE customers add a second layer of control on top of the choice they already have. PG&E still delivers power over its lines in both cases, and we take care of connecting your system to the grid whichever provider you're on.

Why Homeowners Choose Sun First Solar

Sun First Solar was founded in Northern California in 1984, and we're still a family business. Every installation is done by our own Sun First team. Over four decades, we've installed more than 100,000 solar panels and over 500 battery systems across the Bay Area, and Contra Costa is part of the service area we cover, along with Marin, Sonoma, Napa, Alameda and San Mateo. We hold an A+ rating with the Better Business Bureau, and our panels carry a 25-year manufacturer's warranty.

Get a Free Solar and Battery Quote

Call us at 415-458-5870, Monday through Thursday from 8 a.m. to 5 p.m., or request a free quote online. We'll put together a free analysis so you can see how much you could save, and we'll size your solar and battery as one system for your home. Take your time, and bring us any questions about your own house.