4th Day Energy designs, installs and maintains solar electric systems in Central California. We are a licensed California PV (photovoltaic) installer. Our team designs custom residential solar systems and commercial solar systems to fit your month usage and roof structure.

4th Day Energy is passionate about using responsible energy solutions to meet the needs of our high tech world. From our focus on PV and solar thermal, we are expanding to offer a broader array of renewable energy technologies. We are dedicated to the highest quality energy solutions that bring lasting value. Customer service, creativity and craftsmanship are our greatest calling. We are on track with advances in technology, changes in regulations and legislation. Customers benefit from our ever expanding network of strategic alliances. 4th Day Energy was founded by Duane Deister, a Californian with a life-long passion for renewables. Duane earned college degrees in solar technology and HVAC, and has been designing and installing solar systems since 1992. Prior to 4th Day Energy, he was a co-founder, owner and operator of SunStar Energy. Duane and the team of 4th Day Energy are recognized for excellence in the industry, and remain on the forefront of innovation.