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November, 2001
Nesjavellir Geothermal Power Plant in Iceland



On June 29, 2001, a full-scale ceremony was held at the power plant to celebrate the completion of Nesjavellir No. 3 Geothermal Turbine Generator to be delivered to Reykjavk Energy in the city of Reykjavik, Iceland. The ceremony was attended by two hundred people, including such VIPs as IcelandÁs Minister of Industry and Minister of Agriculture. Highlights of the ceremony were reported in the news on TV and in the press.

Nesjavellir geothermal power plant is located about 30 km east from Reykjavik, Iceland. The purpose of this plant is to co-generate both electricity for the national grid and hot water for the district heating system. Three condensing steam turbine units produce 3 x 30 MW by utilizing 12 bara saturated geothermal steam from a production well, and its electricity is mainly purchased by aluminum smelters. The exhaust steam from the turbines is used to preheat fresh groundwater, which is led to the condenser as cooling water. This preheated water is further heated up to 88 by an existing hot water plant, and then transmitted to Reykjavik by 800 mm diameter pipelines.

MHI supplied the main equipment such as the turbine-generator, condenser, gas extraction system and control system for power generation.
The turbines are of single flow, top exhaust construction, which makes the entire plant compact by installing it on ground level. The condensers are of shell & tube type with six passes to meet the requirements for both condensing the turbine exhaust and heating the cooling water. Vacuum pumps are utilized for the gas extraction system.
The main specifications of this plant are as follows.

PLANT SPECIFICATION
Output 30,000kW x 3 Units
Steam condition 12 bara x 188
Gas content 0.8% by weight
Condenser pressure 0.2 bara
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