Portland General Electric has taken another bite out of its pending capacity deficit by signing a power purchase agreement with the Confederated Tribes of Warm Springs (CTWS) for their share of the output from the 500 MW Pelton Round Butte hydroelectric project on the Deschutes River.

The project is the largest hydroelectric facility located entirely in Oregon.

The utility owns 66 percent of the project's output, and will purchase the remaining third through 2040, according to a press release. In addition, CTWS will exercise an option in its 2001 contract with PGE to increase its ownership share of the project from 33 percent to 49 percent.

PGE and CTWS have been co-managing the project since 1980.

The utility announced in June that it was negotiating for the CTWS share of the hydro project.

PGE has been hunting for emissions-free hydro resources to help meet its projected capacity deficit, and the deal with the tribes trims the current projected capacity deficit to 287 MW in 2025 and 685 MW in 2026.

In the past few years, the utility has signed a series of contracts for hydroelectric capacity from Douglas County PUD and BPA.

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