Scheduled to be constructed at a cost of up to £1bn, the new plants will generate a total of 2.1GW at Spalding Energy in Lincolnshire and Gateway Energy Centre in Essex.

Adjoining existing InterGen facilities, the two sites offer easy access to gas and transmission networks.

InterGen president and CEO Neil Smith said, ”We have secured a very competitive deal with Siemens representing a unique opportunity.”

InterGen European business head Mark Somerset said the combination of the sites, Siemens offer, low cost access to the networks and proximity to current InterGen plant will make the plants ultra-competitive.

”With a firm offer from such a world-class company as Siemens, InterGen stands ready to deliver energy for the UK provided Government delivers Electricity Market Reform which attracts investment and gives our customers and ourselves the confidence we each need,” Somerset added.

”My message to Government is to design a Capacity Mechanism which enables independent generators such as InterGen to finance projects such as these.”

Expected to come on line by 2018, the plants will feature Siemens’ proven H technology, offering the highest efficiency in the market and creating 3,000 jobs during construction.