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Baseload Resources

 

Craig Station Craig Station is a key baseload resource providing the association with a total of 655 megawatts of relatively low-cost, reliable generation . Operated by Tri-State, approximately 300 people work at the 1,311-megawatt plant. Craig Station Units 1 and 2 make up the Yampa Project, owned by Tri-State and four other regional utilities. Tri-State is the sole owner of Unit 3.

In 2002, the association embarked on its largest environmental project upgrade in its 50-year history at Craig Station. It marked the beginning of a $121 million, multi-year retrofit to Units 1 and 2 to address opacity concerns and the mitigation of particulate matter. The upgrades were prompted by a settlement agreement reached between the Sierra Club and the five owner utilities of the Yampa Project.

 

Plant Statistics

Plant operator

Tri-State G&T

Plant construction

1974 to 1984; construction was completed on Unit 2 in 1979, Unit 1 in 1980 and Unit 3 in 1984

Total project cost

$1.2 billion

Total capacity

1,311 megawatts (net);
Tri-State share - 655 megawatts (24 percent of Units 1 and 2; 100 percent of Unit 3)

Coal source

Trapper, Colowyo and other mines in the region

Plant site size

1,120 acres

Stack height

600 feet (each)

Water source

Yampa River; supplemental allocations from Elkhead Creek Reservoir (Units 1 and 2) and Yamcolo Reservoir (Unit 3)

Environmental
controls

A wet limestone scrubber system removes 90 percent of the sulfur dioxide produced for Units 1 and 2, while a dry lime system is used for Unit 3; fabric-filter baghouse collects 99 percent of fly ash; state-of-the-art low-NOx burners and over-fired air reduce the formation of nitrogen dioxide; a continuous 24-hour emissions-monitoring system ensures that flue gas emissions comply with federal and state laws

 

Coal Supply

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.

Trapper Mine, which is owned by Tri-State and certain members of the Yampa Project, delivers coal to the plant via 100-ton haul trucks from the mine site. Colowyo Mine delivers coal to Craig Station daily by train.

The station also augments these two sources of coal with spot coal purchases from other mines in northwestern Colorado.


Trapper Mine Statistics

Ownership

Trapper Mining, Inc.

Mine site size

10,000 acres

Annual yield

2.3 million tons

Daily production

7,000 to 10,000 tons

 

Colowyo Mine Statistics

Ownership

Western-Fuels Colorado

Mine site size

12,000 acres

Annual yield

2.3 million tons

Daily production

10,000 tons

 

Nucla StationNucla Station near Nucla, Colo., produces 100 megawatts of generating capacity and is the world's first utility-scale power plant to utilize atmospheric circulating fluidized-bed combustion. The station employs more than 50 people in southwestern Colorado.

 

Plant Statistics

Plant owner and operator

Tri-State G&T

Plant construction

1957 - 1959

Re-powering project 1985 - 1987

Total project cost

$112 million

Total capacity

100 megawatts (net)

Coal source

New Horizon Mine

Plant site size

60 acres

Stack height

215 feet

Water source

San Miguel River; supplemental allocations from Trout Lake

Environmental
controls

Atmospheric circulating fluidized-bed combustion that provides more than 70-percent capture of sulfur dioxide emissions and reduces the formation of nitrogen dioxide; fabric-filter baghouse that collects 90 percent of all particulates

 

Coal Supply

Nucla Station receives its coal supply exclusively from New Horizon Mine, five miles south of the plant, by tractor-trailer truck. The station takes delivery of up to 64 25-ton loads each day.

 

Environmental Leadership Award

Nucla award seal

The Colorado Department of Public Health and Environment (CDPHE) has awarded Tri-State as a Bronze Achiever under the Colorado Environmental Leadership program (ELP) for making significant achievements in operating its 100-megawatt Nucla Station in compliance with all air, land and water regulations.  Tri-State is the only electric utility in the state to be admitted into the program, which has been in place since 1999.

 

Located outside the southwestern Colorado town for which it is named, the power plant was selected for the ELP award due to its implementation of the Environmental Management System (EMS) over the past eight years.  “This is a great achievement for our employees at Nucla Station,” said Mike McInnes, Tri-State’s senior vice president of production.  “It serves as an acknowledgment of the measures that we are already taking at our power plants to meet environmental compliance requirements.”

 

New Horizon Mine Statistics

Ownership

Western Fuels-Colorado

Mine site size

20 acres

Annual yield

350,000 to 400,000 tons

Daily production

1,600 tons

 

Escalante Station Escalante Generating Station near Prewitt, N.M., is a single-unit, 250-megawatt, coal-fired power plant. With a work force of about 120 employees, the station produces a majority of the electricity used by more than 250,000 end-use consumers comprising the 12 Tri-State member utilities operating in New Mexico. In addition to providing electric power, Escalante supplies excess steam to the adjacent McKinley Paper Co. for the manufacture of linerboard.

 

Plant Statistics

Plant owner and operator

Tri-State G&T

Plant construction

1980-1984

Total project cost

$450 million

Total capacity

245 megawatts

Coal source

Lee Ranch Mine

Plant site size

2,560 acres

Stack height

450 feet

Water source

underground wells

Environmental
controls

A wet limestone scrubber system removes 90 percent of the sulfur dioxide produced at the plant; fabric-filter baghouse collects 99 percent of fly ash; continuous 24-hour emissions monitoring system assures that flue-gas emissions comply with federal and state laws

 

Coal Supply

Escalante Generating Station receives its coal supply primarily from Lee Ranch Mine, 35 miles north of the plant, by rail. Sixteen trains per month with 52 100-ton railcars deliver the coal.

 

Lee Ranch Mine Statistics

Ownership

Peabody Natural Resources

Mine site size

16,000 acres

Annual yield

5.5 million tons

Daily production

16,000 tons

 

Laramie River StationLaramie River Station located near Wheatland, Wyo., is a three-unit, 1,710-megawatt, coal-fired electric generating facility. Part of the Missouri Basin Power Project, LRS is owned by six participants including Tri-State, which owns a 24 percent capacity share of the plant.

Plant Statistics

 

Plant operator

Basin Electric Power Cooperative, Bismarck, N.D.

Plant construction

1976-1982

Total project cost

$1.6 billion

Total capacity

1,710 megawatts
Tri-State share - 410 megawatts

Coal source

Coal is shipped by rail to the plant from mines in the Powder River Basin.

Plant site size

650 acres

Stack height

604 feet (each)

Water source

Grayrocks Dam and Reservoir

Environmental
controls

Electrostatic precipitators remove 99 percent of fly ash and scrubbers remove 80 to 90 percent of sulfur dioxide from stack emissions; low-NOx burners reduce the formation of nitrogen dioxide

 

Coal Supply

Laramie River Station receives its coal supply from various mines, including Dry Fork Mine, in the Powder River Basin, located about 190 miles north of the plant. More than 40 trains per month, each averaging 136 120-ton railcars deliver the coal to the station's coal yard.

 

Dry Fork Mine Statistics

Ownership

Western Fuels-Wyoming

Mine site size

7,000 acres; 4,160 acres of federal and Wyoming coal leases

Annual yield

5.6 million tons

Daily production

13,000 tons

 

San Juan Generating StationSan Juan Generating Station located near Farmington, N.M., is four-unit coal-fired facility that provides Tri-State with about 41 megawatts of capacity. In January 1996, Tri-State purchased an 8.2 percent share from Unit 3 at the plant, which is operated by Albuquerque, N.M.-based Public Service New Mexico. San Juan Generating Station is the seventh-largest coal-fired station in the West.

 

Plant Statistics

Plant  operator

PNM

Plant construction

1973

Total capacity

1,800 megawatts (gross)
Tri-State share – 40 megawatts
(8.2 percent of Unit 3)

Coal source

San Juan Coal Company – BHP Billiton

Plant site size

521 acres

Stack height

400 feet (each)

Water source

San Juan River

Environmental
controls

A state-of-the-art limestone forced-oxidation system removes 80 percent of all sulfur dioxide produced at the plant; electrostatic precipitators remove 99 percent of fly ash and low-NOx burners reduce the formation of nitrogen dioxide; continuous 24-hour emissions monitoring system ensures that flue gas emissions comply with federal and state laws

 

Coal Supply

San Juan Generating Station receives its coal supply primarily from San Juan (underground) Mine, about two miles from the plant by truck.

 

San Juan Mine Statistics

Ownership

San Juan Coal Company - BHP Billiton

Mine site size

17 square miles

Annual yield

7.8 million tons

Daily production

17,810 to 19,810 tons per day (average)

 

Springerville Generating StationSpringerville Generating Station located in east-central Arizona, is a three unit coal-based, 1,178-megawatt power plant operated by Tucson Electric Power. In 2006, a third unit producing 418 megawatts was added by Tri-State. Under contractual agreements, Tri-State, as the lease holder of Unit 3, is taking 418 megawatts of capacity from the unit and selling a portion of its output to other regional utilities.

 

Plant Statistics

Plant  operator

Tucson Electric Power

Plant construction

2003-2006

Total project cost

$935.7 million

Total capacity

418 megawatts

Coal source

North Antelope Rochelle Mine, Wyo. (Unit 3); Lee Ranch Mine, N.M. (Units 1 and 2)

Plant site size

22 acres

Water source

Well Water

Environmental
controls

State-of-the-art equipment was designed for the flue gas cleanup system, such as low NOx burners and selective catalytic reduction (SCR) for NOx control, dry flue gas desulfurization (DFGD) system for SO2 control and the pulse jet baghouse for particulate control, for a continuous 24-hour emissions monitoring to assure compliance with the federal and state regulations.

 

Coal Supply

Springerville Generating Station’s Unit 3 receives its coal supply by rail primarily from North Antelope Rochelle Mine, nearly 65 miles south of Gillette, Wyo., in the Powder River Basin. Ten trains per month with 128, 120-ton railcars deliver the coal.

 

North Antelope Rochelle Mine Statistics

Ownership

Powder River Coal Company (Peabody)

Mine site size

Approximately 11,000 acres

Annual yield

80 million tons

Daily production

220,000 tons

 

 

 

 

 
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