MISO works out interconnect deal for Interstate’s Marshalltown project in Iowa

The Midcontinent Independent System Operator filed with the Federal Energy Regulatory Commission on May 14 a Generator Interconnection Agreement with Interstate Power & Light and transmission owner ITC Midwest LLC for Interstate’s in-construction Marshalltown Generating Station project in Iowa.

Said the GIA about Interstate: “Interconnection Customer shall install a 635 MW net summer output at 40 degrees C/700 MW net winter output at 0 degrees C natural gas fired combined cycle Generating Facility with all studies performed at or below the net output as applicable. The Generating Facility shall consist of two (2) Siemens SGT6-5000F5ee combustion turbine generating units, each rated at 262 MVA and one (1) Siemens SST6-5000 steam turbine generating unit, rated at 306.5 MVA. Interconnection Customer has requested 100% NRIS Interconnection Service for net summer output level, for a total of 635 MW NRIS. The project, J233, is referred to by the Interconnection Customer as the Marshalltown Generating Station, or MGS.

“Each combustion turbine generator will step up from 18 kV to 161 kV via 18/161 kV 179/238/297 MVA generator step-up transformers. Each of the combustion turbine generators will connect to the Transmission Owner’s 161 kV Marshalltown substation bus via an approximately 4,000 foot radial overhead 161 kV bus from the MGS plant substation. The steam turbine generator will step-up from 18 kV to 161 kV via an 18/161 kV 205/273/341 MVA generator step-up transformer. The steam turbine generator will connect to the Transmission Owner’s 161 kV Marshalltown substation bus via an approximately 4,000 foot radial overhead 161 kV bus from the MGS plant substation.”

The targeted commercial operation date for the project under the GIA is March 1, 2017.

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.