ERLANGEN, Germany -- The Goliat floating offshore platform for the production, storage and offloading of oil and gas north of Norway in the Barents Sea will not, as is customary practice, be supplied with power generated by onboard gas turbines and generators but from the shore via a 106-km (66-mi) long subsea cable. This decision, in turn, is expected to result in a 50% reduction of CO2 emissions.
Siemens Energy says it will supply a turnkey shoreside power supply system, which essentially comprises a substation located in Hammerfest in northern Norway, overhead transmission lines, buried cable and a state-of-the-art reactive-power compensation system. The purchaser is the oil and gas company Eni Norge based in Stavanger, Norway. The shoreside power supply to the platform is scheduled to come on line in 2012; the start of production in the Goliat field is planned for late 2013.
A floating (FPSO) platform like Goliat is used for the production, storage and offloading of oil and gas. Whereas the power for platforms of this kind is customarily generated by onboard gas turbines and generators, the Goliat platform will in the future have a shoreside power supply. This will reduce CO2 emissions by half compared to conventional technology.
For the shoreside power supply system, Siemens will build the new Hyggevatn substation located two kilometers from the center of the Hammerfest municipailty. It will be connected to the regional power supply network via a 132-kV overhead transmission line and will supply both the Goliat platform and the smaller local network in Hammerfest.
For this purpose, Siemens will replace existing overhead transmission lines with a new line between the new substation and an existing one in Hammerfest. The company also says that it will supply the buried cable from the Hyggevatn substation to an underground connecting point on the coast, from where the subsea cable will be routed to the platform.