A $1.5 million Koret Foundation gift has completed a $25 million capital campaign at Congregation Kol Emeth in Palo Alto for a rebuilding project that officials say will make it the first net-zero energy synagogue in the United States.

The two-year Koret grant, announced this week by the 600-family Conservative congregation, came after synagogue members had raised more than $23.5 million. The Koret Foundation is based in San Francisco.

Kol Emeth, founded in 1957, has begun to completely rebuild its facility, and the new building will be one of only two synagogues in the U.S. to be certified as LEED Platinum, congregation officials said.

LEED, which stands for Leadership in Energy and Environmental Design, is a national certification system developed by the U.S. Green Building Council that rates buildings based on an efficient use of energy and other resources.

A net-zero energy building uses the same amount of energy as it creates on an annual basis.