US based power-equipment vendor Active Power has sold three of its flywheel-based uninterruptible-power-supply systems to an unnamed agency within the US federal government. The system's capacity totals about 3MW.

All three CleanSource 1200kVA UPS systems are expected to be installed at the agency's mission-critical data center on the east coast before the end of the second quarter.

Martin Olsen, VP and general manager of global sales and business development at Active Power, said the systems were both space- and energy-efficient.

"We've integrated our patented flywheel energy storage technology and UPS electronics into one single cabinet so the system is extremely power dense, delivering up to twice the power in the same space of a conventional system," he said.

"At the same time, we're able to deliver critical backup power at an overall economic advantage due to the system's high efficiency, up to 96% energy-efficient even at 40% load, which is a typical load for a UPS system."

Active Power offers CleanSource UPS systems ranging from 130-3600kVA per system. Instead of conventional batteries, the systems use flywheel technology to store energy.

Active Power representatives will be showcasing a number of the company's solutions for critical data center power systems this week at the DatacenterDynamics conference in Phoenix. The conference will take place on Wednesday, 13 April, at the Hyatt Regency Phoenix.