I'm aware of 2 WEL-monitored installations in CA ( http://welserver.com/ww/ ).
One of which is a gas fired unit ( http://welserver.com/WEL0135/ ) in Gold River.
The other installation may be a geothermal installation since it also has solar electricity production, but, I'm not sure. It's at http://welserver.com/WEL0038/ , located in San Francisco.
Hope this helps.
Best regards,
Bill