Environmental Standards & TMPA

TMPA maintains a proactive stance in meeting environmental standards. The voluntary fuel conversion from lignite to Wyoming (PRB) sub-bituminous coal in 1996 halved TMPA’s emissions of sulfur dioxide (SO2). Another project implemented several years later reduced TMPA’s emissions of nitrogen oxides. In April 2011, TMPA voluntarily implemented a scrubber project that has further reduced its emissions of sulfur dioxide. By the year 2012, TMPA’s emissions of sulfur dioxide and nitrogen oxides (the main sources of acid rain) will be 90% less than the emissions in 1995. The scrubber also helps to reduce mercury emissions to levels that will meet or exceed future emissions standards.

TMPA Lignite Mine

TMPA owns Gibbons Creek lignite mine that was the original source of fuel for the power plant. Lignite is a low grade form of coal that gradually became less competitive against higher grade sub-bituminous coal from the Powder River Basin in Wyoming. The mine was operational from 1982 to 1996. In 1996 the mine was closed and TMPA began importing all of its coal from Wyoming.

Since its closure, the mine has been in reclamation. Most of the large construction projects, such as the reclamation of final open pits, have been completed and the mine has been converted to a post-mining land use that consists of pasture land, ponds, and woodlands. It is now in the process of being monitored and being released from mine reclamation obligations as it meets regulatory performance standards.

At present, over 60% of the mined area has been released partially from its performance bond and additional areas are being prepared for final bond release.

Scientific Publications & Research Papers


CCR Rule Compliance Data & Information

Site F Landfill

Ash Ponds (A,B, & C)

Scrubber Sludge Pond