The Colusa Generation station is a 640MW duct fired combined cycle plant using GE frame 7FA combustion turbines and GE reheat steam turbine. The plant incorporates a air cooled condenser and a zero liquid discharge waste water treatment system.
The plant design began in November of 2007 and the project completion is scheduled for August 2010.

The Roseville Energy Park project is a 160 MW combined-cycle power generating facility based upon an SWPC power island consisting of two Siemens Westinghouse SGT-800 turbines, duct-fired, two pressure non-reheat HRSG's and a non-reheat axial exhaust steam turbine. The project also includes a Zero Liquid Discharge system for processing of plant wastewater as well as generation of demineralized water.
Gemma's EPC scope of work includes complete plant design, equipment procurement, construction and start-up/commissioning responsibility.
Construction began in August 2005 with Substantial Completion achieved in October 2007.

The Hines Power Block II project is a combined cycle plant based upon an SWPC power island consisting of two Siemens Westinghouse 501-F combustion turbines, Vogt-NEM HRSGs, and Siemens steam turbine generator.
Gemma’s EPC scope of work included complete plant design and construction from site development through substation and electrical interconnection. The plant used a cooling pond as a feed to the STG condenser.
Construction began in February 2002 and commercial operation was achieved in December 2003.

The Rowan County power project is a 525 MW two on one combined cycle power island. The combustion turbines are General Electric 7-FA units. The HRSGs were supplied by Nooter/Eriksen and the 190 MW steam turbine was supplied by Toshiba.
Gemma's EPC scope of work included complete plant design and construction from site development through electrical interconnection and initial plant operations.
Construction began in November 2001 and commercial operation was achieved in May 2003. 2003.

The Effingham County power project is a 525 MW two on one combined cycle power plant. The combustion turbines are General Electric 7FA units. The HRSGs were supplied by Nooter/Eriksen and the 190 MW steam turbine was supplied by Toshiba.
Gemma's EPC scope of work included development support, complete plant design and construction from site development through substation and electrical interconnection and included the off site gas metering station.
Construction release occurred on February 1, 2002 and commercial operation was achieved in August 2003.

The Richmond County Phase II power project is a 525 MW two on one combined cycle power island and a 178 MW simple cycle power island. All three combustion turbines are General Electric 7-FA units. The HRSGs were supplied by Nooter/Eriksen and the 190 MW steam turbine was supplied by Toshiba.
Gemma's EPC scope of work included complete plant design and construction from site development through electrical interconnection.
Construction began in October 2000 and substantial completion was achieved in June 2002.