Tri-State Generation and Transmission has picked a Hitachi America Ltd subsidiary to design and supply a selective catalytic reduction (SCR) system for Unit 2 of Tri-State’s Craig coal plant in Colorado.
The SCR contract includes Hitachi’s proprietary catalyst. Craig 2 is a 428-MW unit that burns Colorado low sulfur bituminous coal as its primary fuel.
SCR systems reduce nitrogen oxide (NOx) emissions, a contributor to the formation of ozone and smog. The SCR system being furnished by Hitachi Power Systems America (HPSA) uses Hitachi’s catalyst that provides high NOx removal over a wide operating range.
The system is designed for continuous operation throughout the year. (Some SCR systems operate during warm-weather months).
“This contract represents another important milestone in the deployment of Hitachi’s proven technologies to the U.S. markets and further establishes HPSA’s important leadership position as an industry leader in the reduction of emissions from power generation facilities,” HPSA President and CEO Henry Bartoli said in a news release.
The news release did not specify the timetable for installing the SCR system. However, a Tri-State spokesperson said that “Tri-State will comply with the Colorado State Implementation Plan by its deadline of January 2018.”
An environmental group, WildEarth Guardians, has sued Colorado air regulators and argued that the state and Tri-State are not doing enough to reduce emissions at the three coal-fired units that comprise the 1,300-MW-plus Craig coal station.
Unit 1 at Craig was offline for much of the latter half of 2013 due to equipment issues.
According to the Tri-State website, Craig Station receives its coal supply primarily from two sources: Trapper Mine, located one mile south of the plant and Colowyo Mine sited about 30 miles southwest of the station.
The Tri-State website notes that Tri-State owns 24% of Craig Units 1 and 2; 100% of Unit 3.
Tri-State Generation and Transmission Association is a wholesale electric power supplier owned by the 44 electric cooperatives that it serves. Tri-State generates and transports electricity to its member systems throughout a 250,000 square-mile service territory across Colorado, Nebraska, New Mexico and Wyoming.