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NCPA 'STIG' unit at Lodi faces decommissioning or repower; Roseville to consider $2.3 million study deposit
Summary
NCPA declared the STIG steam-injected gas turbine at the Lodi Energy Center unsafe to operate in December 2024; Roseville staff told the PUC the choice is between decommissioning or repowering with an LM6000, and recommended a $2.3 million phase‑2 agreement to fund studies and a turbine deposit.
Roseville Assistant Electric Director Bill Forsyth and Power Supply Administrator Petra Wallace told the Public Utilities Commission on Jan. 28 that a 49.9-megawatt steam-injected gas (STIG) turbine owned through the Northern California Power Agency (NCPA) was declared unsafe to run in December 2024 and is now at an end-of-life decision point.
“Because we don't have blast walls adjacent to the turbine, you need to expect it could just completely fall apart,” Forsyth said, describing outside-engineer findings that followed escalating vibration and tripping events in October and December. NCPA participants must decide whether to decommission the unit or repower it with a newer turbine model.
Wallace presented cost estimates. Full decommissioning and site…
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