Wisconsin PSC okays emissions project for Fennimore diesel generators

The Public Service Commission of Wisconsin on Nov. 6 approved an Oct. 2 application from the city of Fennimore, acting as an electric public utility, for authority to upgrade its generator exhaust system at its existing electric generating facility, located in the city of Fennimore, Grant County, Wisconsin.

The estimated total cost of the project is $425,000. Said the Nov. 6 approval order: “Completion of this project will not substantially impair the efficiency of the service the applicant provides. Completion of this project will not provide facilities unreasonably in excess of Fennimore’s probable future requirements.”

Fennimore is a Class C electric utility providing electric service in the city of Fennimore and is a member of the Upper Midwest Municipal Energy Group, formerly the Western Wisconsin Municipal Power Group. Fennimore purchases energy from Dairyland Power Cooperative (DPC). Fennimore owns and maintains standby electric generating units that are accredited in the Midcontinent Independent System Operator (MISO) pool through DPC, and Fennimore receives capacity payments from DPC.

The Fennimore generating facility is located adjacent to the utility’s office. The 7.6-MW facility consists of five reciprocating internal combustion engine (RICE) generators, ranging in size from 968 kW up to 1,825 kW of nameplate capacity. These generating units began operation at various times between 1952 and 2000. All of the RICE generating units are fueled with diesel oil.

Fennimore’s proposed project is to replace the aging exhaust systems in its existing RICE generators with new residential grade silencers and related equipment. This equipment would include oxidation catalysts, a crankcase vent system, and a continuous emissions monitoring system. The proposed replacement silencers are combination units, containing a total of 13 oxidation catalyst elements, which would be accessible from the outside for cleaning and replacement. The replacement silencers would be located in the exact position as those removed. The silencers would be of a residential grade, providing a higher degree of noise control than the existing deteriorated silencers.

The catalytic units would reduce carbon monoxide emissions by 70%, and control emissions of total hydrocarbons, particulate matter (PM10, PM2.5) and odor causing compounds. In accordance with Fennimore’s wholesale power contract with DPC, these units have been registered by DPC in the Demand Response Program of MISO as emergency generators. Under MISO tariff rules, the units are also eligible to be counted as capacity resources, enabling Fennimore to meet its reserve adequacy obligations.

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.