Illinois EPA issues revised air permit for Dallman coal plant

The Illinois Environmental Protection Agency has issued a revised Clean Air Act Permit Program (CAAPP) authorization for the city of Springfield, Ill., for its coal-fired Dallman power plant.

The initial CAAPP permit for Dallman was issued by the Illinois EPA in September 2005. The permit addressed the applicable emission standards and requirements existing at the time the permit was issued. In a subsequent appeal to the Illinois Pollution Control Board, Springfield’s City Water, Light and Power (CWLP) challenged the applicability of certain legal requirements and the imposition of certain requirements for monitoring in the CAAPP permit.

In the years since the appeal, the issued permit had been stayed in its entirety. The presence of the stay, which was a consequence of the Illinois administrative review process, has prevented the issued permit from becomingeffective. In addition, the stay has enacted to prevent the renewal and revision of the CAAPP permit for the Dallman Station, which would have enabled the CAAPP permit for this source to appropriately address new rules and other relevant developments. The initial steps to advancing the development of an appropriate CAAPP permit for this source is to provide for the effectiveness of a CAAPP permit and the resolution of the permit appeal. The CAAPP permit for the source can and must then be brought up-to-date by the Illinois EPA through permit reopening and, as needed, additional permit revisions.

Approved has been a significant modification of the CAAPP permit for the Dallman Station planned by the Illinois EPA that would make certain revisions to the permit initially issued for this source that arise from the settlement of the permit appeal.

This Oct. 18 revised permit covers three operational coal units at Dallman. A fourth, Dallman 34, will be covered under a separate permit action. The two associated Lakeside units are shut and will be removed from the permitting.

The next steps in this process are the settlement of the appeal, which has already been initiated, and the formal reopening of the CAAPP permit for Dallman Generating Station. In this permit reopening step, new requirements that have been adopted under the Clean Air Act since the original permit was issued, which are now applicable to Dallman, will be added into the permit. Those include the requirements of the federal Clean Air Interstate Rule and the Mercury and Air Toxics Standards.

Said the Springfield CWLP website about its power supply: “CWLP’s generating capacity is provided by four coal-fired steam turbine generators (with a total nameplate rating of 572 megawatts [MW]), one dual-fuel natural gas- and oil-fired combustion turbine (with a total nameplate rating of 115 MW), two oil-fired combustion turbines (with a total nameplate rating of 31 MW), and three oil-fired diesel generating units (with a total nameplate rating of 5 MW). Based on nameplate ratings, CWLP’s total summer maximum net generating capability is 723 MW (although testing in 2012 showed the actual total capacity at that time to be 691 MW.) The start-up of the 200-MW Dallman 4 generating station in Summer 2009 allowed CWLP to stop using the last two operating 1960s-vintage generating units at Lakeside Power Station.”

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.