Cambridge Station Unit 2 Combustion Turbine Fuel Conversion Project

On March 11, 2022, GRE filed an application with the Commission for approval of a minor alteration to the site permit for the Unit 2 Combustion Turbine (Unit 2 CT). If approved, GRE would replace Unit 2 CT’s existing natural gas burners with dual-fuel burners to allow ULSD combustion in addition to natural gas combustion. The applicant indicates that ULSD as a back-up fuel source is necessary to provide power during natural gas curtailments. GRE defines “curtailment” to mean when natural gas is unavailable or ULSD is more economical than natural gas. The project has an anticipated operating life of 30 years.

New burners would replace existing burners on Unit 2 CT. The project would also require a 500,000-gallon ULSD AST, a 430,000-gallon demineralized water AST, and associated piping, pumps, and controls. A building extension to the south end of the existing pumphouse would be necessary to house some of this associated equipment. GRE will contract for a mobile reverse osmosis (RO) system that will use facility well water to make demineralized water. Demineralized water reduces NOX emissions when co-injected with ULSD into the new burners. Demineralized water will evaporate in the combustion process.