The Montana Department of Environmental Quality is taking comment until Jan. 29 on a proposed one-year extension of the April 2015 federal Mercury and Air Toxics Standards (MATS) compliance deadline for the coal-fired Lewis & Clark plant of Montana-Dakota Utilities.
The DEQ said it intends to approve changes to the Operating Permit for the plant. The following requirements pertaining to the compliance deadline extension would be incorporated into that permit as part of its forthcoming, every five years permit renewal:
- Montana-Dakota Utilities shall complete the construction activities for the mist eliminator retrofit and sieve tray installation by December 31, 2015.
- Montana-Dakota Utilities shall notify DEQ when the construction activities for the mist eliminator retrofit and sieve tray installation are complete.
- Montana-Dakota Utilities shall comply with the applicable non-mercury emission standards of MATS by no later than April 16, 2016.
Lewis & Clark consists of a tangential coal-fired boiler (Unit 1, 50 MW) capable of burning coal or natural gas and associated equipment for generation of electricity. The facility is located in Richland County, Montana. Montana-Dakota is a subsidiary of MDU Resources Group (NYSE: MDU). The DEQ, incidentally, is also taking final comment on a plan to approve an air permit allowing the installation of two 9.3-MW gas-fired peaking units at the Lewis & Clark site.