German conglomerate Siemens has secured an order from Hyundai Engineering and Construction (HDEC) to deliver three generator switchgears for a $1.17bn Sarulla geothermal power project in Indonesia.

Located in Tapanali Utara in the North Sumatra province, the power project will have three Siemens type HB3-80 switchgears, each with a 100MVA output, 12kV voltage and a rated current of 5,000A.

Under terms of the contract awarded to Siemens, the firm is expected to supply the first switchgear this September, for the plant presently under construction.

The remaining two switchgears, to be manufactured in Germany, are scheduled for delivery in June 2016.

Siemens’ HB3-80 generator switchgear is a single-phase, encapsulated tool claimed to eliminate the risk of short circuits between phases, to offer the utmost operating reliability and improved personnel safety.

Sarulla Operations (SOL) is the owner and operator of the geothermal project, and the company is a joint venture of PT Medco Energi International (27.5%), with Ormat 12.75%, Itochu 25%, and Kyushu Electric 25%.

HDEC acts as the engineering, procurement and construction (EPC) contractor for the power project and is expected to complete its construction by 2018.

Commissioning of the geothermal power plant, claimed to be the largest of its kind in Indonesia, will be carried out in phases.

While the first stage of the project will be operational from 2016, the second and third phases are likely to start in 2017 and 2018 respectively.

Once operational, the project will have an annual power generation capacity of 351MW, which will be purchased by state-owned electricity firm Perusahaan Listrik Negara (PLN).

In 2014, SOL selected Toshiba to deliver three 60MW geothermal steam turbines and generators (STG) for the project.