/PRNewswire/ -- Constellation Wines U.S., the country's leading premium wine company, announced today a major expansion of its solar energy initiative as part of its ongoing commitment to Corporate Social Responsibility (CSR). The company plans to invest in three new solar energy installations across California at its Clos du Bois winery in Geyserville; Ravenswood winery in Sonoma; and Estancia winery in Monterey County. The projects build on the company's solar initiative which began in 2009 with the inaugural installation at the Gonzales winery in Gonzales, Calif. Approximately 17,000 solar panels will be installed at the four wineries by the end of 2010, making the initiative the largest solar footprint in the U.S. wine industry.