Soladigm, which develops energy-efficient glass for buildings, adds $10m to the $30m raised in December after being identified by New York-listed industrial conglomerate General Electric's clean-tech open innovation competition.

Soladigm, a tinted window maker formerly known as Echromics, has added a further $10m to its series C round that initially closed at $30m in December.

The company has added venture capital firms Westly Group and Navitas Capital to its consortium.

Soladigm, which develops energy-efficient glass for buildings, raised $30m in December after being identified by New York-listed industrial conglomerate General Electric’s clean-tech open innovation competition with GE’s Energy Financial Services division investing in the C round.

DBL Investors,…