Indiana agency seeks input related to Clifty Creek FGD project

The Indiana Department of Environmental Management is taking public comment until Oct. 28 on a draft air permit revision covering emissions monitoring equipment changes following installation of new scrubbers at the coal-fired Clifty Creek power plant.

The department’s Office of Air Quality (OAQ) has reviewed an Aug. 26 modification application, submitted by Indiana-Kentucky Electric Corp. for Clifty Creek. This permit modification application is being submitted because IKEC requested and received the department’s approval earlier this year for an exemption to install, operate and certify opacity monitors. The exemption became effective once IKEC placed the new jet bubbling reactor scrubbers into service earlier this year.

As part of IDEM’s approval, IKEC agreed to install, certify, operate and maintain particulate matter (PM) continuous emissions monitoring systems (CEMS) on the stacks in place of the opacity monitors that were originally to be installed in the ductwork prior to the scrubbers.

Clifty Creek has five wet-bottom pulverized coal-fired boilers identified as Units 1 through 5, with construction completed in 1955, each with a rated capacity of 1,869 million Btu per hour (MMBtu/hr). SO3 flue gas conditioning systems are utilized as needed on Units 1 through to maintain opacity and particulate limits. Units 1 through 5 have the following emission controls:

  • over-fire air system (NOX control);
  • selective catalytic reduction (SCR) system (NOX control);
  • “cold-side” electrostatic precipitator (ESP) (particulate control); and
  • flue gas desulfurization (FGD) system (SO2 control) approved under a 2008 permit.

Also, there is one wet-bottom pulverized coal-fired boiler identified as Unit 6, with construction completed in 1956, with a rated capacity of 1,869 MMBtu/hr. Unit 6 has the following emission controls:

  • over-fire air system (NOX control);
  • “hot-side” ESP (particulate control); and
  • FGD system (SO2 control), permitted in 2008.

IDEM noted that the design basis for the FGD and associated facilities is 98% removal of SO2 with a 5.0 lb/MMBtu SO2 coal. U.S. Energy Information Administration data shows that the plant took high-sulfur coal earlier this year from the River View mine in western Kentucky of Alliance Coal, the Prairie Eagle mine in Illinois of Knight Hawk Coal and the Cumberland mine in Pennsylvania of Alpha Natural Resources. It also took low-sulfur coal from Arch Coal‘s Black Thunder mine in Wyoming.

IKEC, a wholly owned subsidiary of Ohio Valley Electric Corp. (OVEC), announced March 25 that the first unit of the six units at Clifty Creek in Madison, Ind., began feeding exhaust gas to the first of two new FGDs. This $670m investment is in addition to other investments in environmental control technologies in recent years that significantly reduced IKEC’s emissions of NOx and particulate emissions.

“The completion of the FGD system at Clifty Creek has been highly anticipated after being postponed from 2009 to 2011. The employees of Clifty Creek are pleased that the system is in service and cleaning the air for ourselves, our families, and our neighbors,” said Cliff Carnes, Clifty Creek plant manager, at the time. “This technology will allow us to continue producing safe and reliable power for a number of years while meeting all environmental regulations and providing critical employment for the community.”

The Clifty Creek plant has six separate 217-MW units. The first scrubber will handle three of the units. A second scrubber, connected to the other three units, was to begin operation in May.

OVEC is owned by several utilities, with American Electric Power (NYSE: AEP) being the operating and coal procurement partner.

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.