US Geothermal Services (USG Services) has signed a repair services agreement with Raft River Energy I for the repair of two production wells at Unit 1 of the Raft River geothermal project in southern Idaho, US.

Under the agreement, USG Services will fund and manage the repair of the RRG-2 and RRG-7 wells with a budget of up to $1.65m.

The RRG-2 well was shut down in June last year after a pump failure and the RRG-7 well has a leak in a cement seal that failed where two steel casing sections overlap, allowing cooler geothermal fluid to enter the well bore.

Upon completion of the repair program, the annual average output of the plant is expected to increase 25% from a current level of 8MW annual average to about 10MW.

In addition to the well repairs, a flow stimulation technique called deflagration will be applied to both wells which may increase fluid flow from the known production zones.