MISO files interconnect deal for Interstate’s 650-MW Marshalltown project

The Midcontinent Independent System Operator on June 2 filed with the Federal Energy Regulatory Commission a substitute unexecuted Amended and Restated Generator Interconnection Agreement with Interstate Power & Light and transmission operator ITC Midwest LLC for Interstate’s Marshalltown gas-fired power project in Iowa.

MISO has designated the Interconnection Agreement as Substitute First Revised Service Agreement No. 2786 under MISO’s FERC Electric Tariff, Vol. No. 1 Fifth Revised. MISO has designated this project as Project No. J233 in its interconnection queue.

On March 4, 2016, MISO filed an unexecuted amended and restated interconnection agreement (“First Revised Agreement”). On May 3, 2016, the commission issued an order conditionally accepting the First Revised Agreement subject to a compliance filing.

The agreement covers a 635-MW (net summer)/700 MW (net winter) natural gas-fired combined cycle facility. It consists of two Siemens SGT6-5000F5ee combustion turbine generating units, each rated at 262 MVA and one Siemens SST6-5000 steam turbine generating unit, rated at 306.5 MVA. The project, J233, is referred to by the Interstate as the Marshalltown Generating Station (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 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 161 kV Marshalltown substation bus via an approximately 4,000 foot radial overhead 161 kV bus from the MGS plant substation. The new Interstate substation will be located in Marion Township in Marshalltown, Iowa.

Under the GIA, the project’s commercial operation target date is March 1, 2017.

Said IPL parent Alliant Energy (NYSE: LNT) about this project in its May 5 quarterly Form 10-Q report: “IPL is currently constructing Marshalltown, an approximate 650 MW natural gas-fired combined-cycle EGU. Construction began in 2014 and is expected to be completed in 2017. As of March 31, 2016, Alliant Energy and IPL recorded capitalized expenditures for construction work in progress of $492 million and AFUDC of $33 million for Marshalltown in “Property, plant and equipment, net” on their balance sheets.”

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.