Residential Solar

*for homes in Northern California

  • What is Solar?

  • Common Questions

  • Our Work

  • Why Choose Us?

  • Solar Reality Check

  • Book a Free Visit

residential solar system

Nevada City Solar Installation

What is Solar and how does it work?

  1. Through Photovoltaic Solar Panels or PV, Sunlight is collected by your solar panel and creates DC power.
  2. The DC power is converted to AC power for your home by the inverter.
  3.  The AC power is now used to power your home.
  4.  Any unused energy is sent back though your utility meter for credit and/or stored in a battery backup system for later use.
residential solar company california penn valley

Grass Valley Residential Solar Installation

Common Questions &

Ideas to consider in your Residential Solar Installation

  • Do I have enough sun?
  • How much will I save with the tax credit this year?
  • Will solar offset my electric bill?

Ground Mount or Roof Top?

Ground Mounted Solar Panels – Grass Valley, CA

Roof Top Residential Install – Grass Valley, CA

  • Do I need a battery backup system?
  • How much will the installation cost?
  • How long is the process?

What color and type of panel can I use?

black solar panels in Residential Solar California

Black on Black Solar Panels

Traditional Checkered Solar Panels

Our Residential Solar Work

visit our gallery for more

What our Customers Say

We understand it’s a big decision to go solar. Good thing we’ve got your back.

Extremely happy with Sustainable Energy. Our meter spins happily backward!! Penn Martin engineered system and showed great patience with our repeated questions. Very polite and respectful installers. My husband (so hard to please ex-construction) has high praise for their workmanship and consideration of our home.
Terri B
Sustainable Energy Group is second to none. They are not just about solar, but energy efficiency. They can educate you on the most beneficial and economic solar system and present to you options on purchase or financing in a way that is easiest to afford and the most economically beneficial.
Michael Mapes
Ray and his guys at Sustainable Energy Group are simply the best. Professional, knowledgeable and efficient!
Andrew Boland
Ray really knows his stuff! Having such an extensive knowledge of the solar industry, he has a passion for sharing sustainable energy options. If you’re looking for ways to reduce energy consumption and or create a more sustainable lifestyle, he’s your guy!
Rachael Pfadt

When you choose Sustainable Energy Group you get:


Established in 2004, Sustainable Energy Group is a multi-licensed contractor specializing in solar energy systems, with a team of experienced
and knowledgeable industry professionals. The company founder Ray Darby is a licensed mechanical engineer with four decades of experience, including 10 years working at the California Energy Commission.

Quality and Craftsmanship

We are committed to providing customers with designs featuring carefully selected products and the latest technology available to ensure durable,
aesthetically pleasing, and efficient solar systems.

In-House Custom Design
All our solar systems are designed in-house by our expert solar designer Penn Martin with 10 years of experience and 400 solar electric systems installed.

Customer Service
As a locally owned and operated company, we pride ourselves on excellent customer service. Every solar system is a long-term investment for the
customer, as it is for us. We offer a 25-year parts and labor warranty that includes our workmanship.

We believe in the Bigger Picture
We are more than a solar company. Other services we offer include energy efficiency consultations, solar water heating systems, electric heating and
cooling systems, and pool heating systems to maximize savings and utility of energy generated through solar electric systems.

Residential Solar Reality Check:

2019 is the best time get solar, and this is not a sales pitch. It’s a reality in California based on policy, tax credits and changes in PG&E.

The Good & The Bad

Reality: Each year the tax credit is going down in California.

Meaning: Every year you do not choose solar you lose thousands of dollars.

Reality: PG & E prices are increasing 5-10% every year!

Meaning: The quicker you install solar, the less you feel the increase.

Reality: Net Metering is changing from 2.0 to 3.0

Meaning: Net Metering is the way PG & E buys back the solar you produce.

Good News: You can however lock in the 2.0 rate for 20 years!

More good news: Solar panels are so efficient now that the cost is not really an issue.  It’s actually one of the smartest investments you can make in our economy.  In 6-7 years, the residential solar installation is paid off, then solar starts to pay you every year.

The best news: We warranty all of our work for 25 years!

Are you seeing a trend that Solar is a smart investment right now?

The Gov't Tax Credit is getting smaller each year!

Or Call us today at (530) 273-4422

There are so many reasons to go solar:

  • energy independence
  • clean energy, brighter future
  • good return on investment
  • rising utility costs

We are here to answer all of you questions – Call us now at (530) 273-4422

grass valley residential solar