Managing Principal at Redwood Energy
Sean Armstrong is the Managing Principal of Redwood Energy, founded in 2011 as the nation’s first all-electric design consultancy. Between 2007 and 2020, Sean led the design of half the ZNE residences built in California, and 1/4th the ZNE residences in North America. Following his mother-in-law’s death in the 2017 Tubbs Fire in Santa Rosa, CA, Sean hired leading environmental lawyers in 2018 to devise municipal, county and state legal strategies to ban gas in buildings that were adopted by 80+ governments nation-wide and led California from 1% all-electric construction in 2019 to 80% in 2023; co-authored 7 practical guides to building electrification; and created specifications for “retrofit ready” 120V heat pump water heaters, 120V cold climate window heat pumps, and 120V induction stoves. Sean has received two Innovation prizes for his ZNE projects from the Department of Energy, and Grand Prizes from the California Building Industry (2016) and the United Nations (2017). Sean was inducted into California’s Clean Energy Hall of Fame in 2022 and served the the U.S. State Department in 2023 as a Speaker on Net Zero to Malaysia.
Sean Armstrong is the Managing Principal of Redwood Energy and has worked for 28 years in building electrification, designed the retrofit and new construction of more than 25,000 all-electric residences for disadvantaged populations, co-authored 7 "pocket guides" to building electrification, provided legal and technical support to building gas bans nationwide, and has received Grand Prize awards from the United Nations and the California Building Industry Association. Sean was inducted into California's Clean Energy Hall of Fame in 2022, and in 2023-2024 is working with other nations on their Net Zero goals on behalf of the U.S. State Department.
