General Compression

Newton, MA
Initial Investment: 2009

General Compression, LLC is a technology-enabled development company that will focus on developing and owning dispatchable advanced compressed air energy storage projects. General Compression's system transforms intermittent renewable energy sources into dispatchable, firm power sources suitable for peaking, intermediate, and baseload generation.

Integral Energy Management

Reno, NV
Initial Investment: 2006

Integral Energy Management is a specialized development and asset management firm that focuses mainly on servicing the geothermal industry.

Integral Energy Management was sold to Oski Energy in 2008.

PipeStem Energy Group

Houston, TX
Initial Investment: 2007

PipeStem Energy Group is a midstream energy company formed to own, operate, and acquire energy assets with focus on terminalling, storage, and renewable fuels infrastructure. PipeStem owns a 590,000 barrel storage terminal located on the Mississippi River in Marrero, LA, which the company plans to expand to 2 million barrels.

Pipestem Energy Group was sold to Magellan Midstream Partners in 2009

ThermaSource

Santa Rosa, CA
Initial Investment: 2006

ThermaSource is a premier geothermal services platform company that provides a variety of mission critical operations to the rapidly growing geothermal sector. ThermaSource specializes in drilling, exploration and consulting for geothermal drilling.