TeleSoft Partners, a San Mateo, Calif., venture firm, has acquired a majority interest in Energy Software & Consulting I and II, which combined is the largest preferred shareholder in Nextant, an energy software, engineering and consulting firm.

Terms were undisclosed.

Other Nexant shareholders include The Beacon Group, Morgan Stanley Global Energy Group, Hellman & Friedman, Nth Power, MC Capital, and IBM.

Here’s the announcement.