About Us


Brooke Hanner has been involved in the electrical industry for over 30 years, and he started his successful contracting firm in 1990 in Oceanside, California. Brooke shares his predecessor’s enthusiasm for solar living and energy independence, and last year he and his wife, Karen, returned to Mariposa County to begin living in the sun-powered home that Brooke designed and built with an off-grid PV system that Brooke designed and installed. “It’s a great feeling to know that we are producing our own power, that we are more energy efficient  than ever,” says Karen. 

A few months back, one of the Hanner’s friends suggested that Brooke meet the local, solar company owner who had built her off-grid system. Consequently, several energetic and fruitful discussions ensued over at the North Fork offices of Offline Solar. The result of those meetings, Brooke Hanner became the new owner of Offline Solar. He hopes to continue the company tradition of locally-owned and respected business leadership, where each grid-tie or offline project is designed  to suit each customer’s unique needs. Brooke and Karen look forward to meeting old and new Offline Solar customers in our Mariposa office soon!  



Don Loweburg

Don Loweburg, Solar Pioneer

Offline Solar was established in 1982 by Don and Cynthia Loweburg. Since then, Offline Solar has installed over 1000 on and off-grid systems throughout the Sierra and Central Valley. 

As one of the solar pioneers in Central California, Don Loweburg, has played a key role in the development of an industry that continues to thrive in an environment of utility pushbacks and technology advances for more than 30 years. Don’s knowledge, persistence and integrity have earned him the respect of both his customers and solar industry colleagues for many decades.

As Don now transfers ownership of Offline Solar to Brooke and Karen Hanner, embarking on new projects during his semi-retirement, he leaves his mark as an solar industry icon. Check out some of Don’s articles on our website.