Foundation Capital has closed on its sixth venture fund to date, pulling in $750 million, of which the firm says it plans to set aside a full $250 million for investment in the burgeoning cleantech space.

The firm’s investments in cleantech companies began back in 2003, but it has so placed relatively few bets, with half of those going to technologies focused on energy management for utilities and the commercial market. However, the firm also recently won one of three coveted spots in a new Department of Energy program, gaining the right to place an entrepreneur in Oak Ridge National Laboratory.

One of the firm’s entrepreneurs-in-resident, Ashmeet Sidana, also recently became a general partner. Skip Glass joined as operating partner, while Mike Brown and Steve Vassallo became principals.

Foundation also invests in consumer Internet, semiconductors, telecommunications and networking, and enterprise software. The firm’s last fund was $525 million, closed two years ago.