About ERCOT's decision regarding Must-Run Alternative proposals
ERCOT recently completed reviewing alternatives to the Reliability Must-Run (RMR) agreement it entered with NRG Texas Power in June for Greens Bayou Unit 5. Under the existing RMR agreement, the unit must remain available through June 2018 in case it is needed to support transmission system reliability under certain critical operating conditions.
During the review of Must-Run Alternatives (MRA), ERCOT did not receive offers that would adequately meet the reliability need served by the Greens Bayou 5 unit. Of the eligible offers received, there was insufficient capacity offered to fulfill the criteria set forth in the request for proposals.
The RMR agreement for the 371-MW Greens Bayou Unit 5 addresses specific reliability concerns on the Singleton-to-Zenith transmission line serving the Houston area. Under the agreement, the unit will remain available during summer peak demand periods in case the unavailability of other transmission and generation facilities in that area result in a critical reliability concern. When the Houston Import Project is energized in summer 2018, ERCOT does not anticipate this issue to continue to be a concern.