Indianapolis Power & Light is making progress with the installation on its big, coal-fired Petersburg plant to meet its needs under the federal Mercury and Air Toxics Standards (MATS), said the utility in a Dec. 19 filing at the Indiana Utility Regulatory Commission.
The filing was for recovery of its latest environmental project expenses. Petersburg Generating Station, located in Pike County, Indiana, has a production capacity of 1,760 MW.
Wrote Thomas Moore, IPL’s Project Engineering Manager with the Environmental Compliance Construction Projects Team for the Mercury and Air Toxics Standards Rule Compliance Project: “Significant amounts of project engineering and construction activities have occurred during this reporting period for the MATS Compliance Project. Foundational work and general construction activities for each generating unit’s compliance plan continued throughout the period.
“Petersburg Unit 4 completed its first scheduled outage in late October 2014. At that time, the Electro-Static Precipitator (ESP) received extensive upgrades for enhanced particulate removal. These included over nine hundred (900) enhanced performance MIGI rappers and sixteen (16) high frequency power supplies (HFPS). During the Petersburg Unit 1 outage, completed in late November 2014, the Unit’s ESP received a heated purge air system and eight (8) HFPS. Both ESP’s also were equipped hopper ash level instrumentation to provide more efficient ash removal. The Flue Gas Desulfurization (FGD) System for Unit 1 also received isolation valves for the discharge piping from the five slurry recirculation pumps. “Construction was initiated for the Activated Carbon Injection (ACI) System, the Calcium Bromide Injection System and the Sodium Based Sorbent (SBS) Injection System common to all of the Petersburg Units. During this reporting period, construction activities for the Unit 3 modifications and equipment additions were undertaken. No major activities beyond engineering and permit applications were completed, nor scheduled, for Harding Street Unit 7 during this time.
“The MATS Compliance Project will continue to progress in several areas over the course of the next eighteen (18) months. All four Petersburg Units have compliance deadlines, with the last ones defined as April 16, 2016. Petersburg Units 2 and 3 have scheduled outages in February and April/May of 2015, respectively. Several tasks are planned for these times to tie-in new equipment, primarily the Pulse Jet Fabric Filter (“PJFF”) for Unit 2 and the new auxiliary transformers and booster fans with motors for Unit 3. Additional tasks, primarily the demolition of the current Unit 2 ESP and the structural steel erection for the Unit 3 PJFF, are also scheduled to begin.”
IPL has incorporated the SBS Injection System into the MATS Rule Compliance Project. The installation of this system is now an integral part of IPL’s compliance program for mercury, particulate matter and acid gases and is included for each of the four units at Petersburg. Construction of the equipment common to all four units is nearing completion. The tie-in work for each unit follows the outage schedules for the particular unit.
IPL has filed for commission approval in a separate docket to repower the coal-fired Harding Street Unit 7 to operate on natural gas, rather than install MATS controls. IPL is still in negotiations with the EPC contractor to finalize the amount of the reduction to the lump sum contract due to the removal of this unit from the scope of work. Following execution of the change order with the EPC contractor, subsequent environmental cost reports will focus on the Petersburg MATS compliance work.
Richard Willis. IPL’s Plant Leader of Maintenance Planning at Harding Street Station, Power Supply, said in accompanying testimony: “The Harding Street Station Unit 7 FGD has operated with routine O&M activities since the Spring 2014 outage. Due to the design of the FGD, planned maintenance inspections and refurbishments on recycle pumps are able to be performed with the unit in service and are being completed between December 2014 and April 2015. Harding Street Unit 7 will not have an outage of sufficient duration to perform any substantial maintenance before the gas conversion in the Spring of 2016.”
Angelique Collier, employed by AES US Services LLC as Director of Environmental Policy, said: “The MATS Rule requires compliance with these strict emission standards by April 16, 2015. However, on December 18, 2012, [the Indiana Department of Environmental Management] issued a compliance extension, allowing IPL Eagle Valley coal-fired units, IPL Harding Street coal-fired units, and two Petersburg coal-fired units (Unit 3 and Unit 4) one additional year, or until April 16, 2016, for compliance with the MATS Standard. Then, on February 8, IDEM granted a three-month compliance extension for Petersburg Unit 2 to July 16, 2015. Further, EPA may allow a 5th year to come into compliance for reliability critical units through an Agreed Order process. IPL maintains the option of working with the Midcontinent Independent Transmission System Operator, Inc. (“MISO”) to determine if the IPL units are critical to reliability.”
The utility is a subsidiary of AES Corp. (NYSE: AES).