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Industry: Energy and Power

Northwestern Energy – David Gates Generating Station at Mill Creek

Corval was the EPC contractor for the design, construction, and start-up of this 150 MW natural gas-fired power plant. The plant consists of three Pratt & Whitney FT8-3 Swiftpac combustion turbines with diesel fuel positioned for back-up. The facility provides “regulation” capability to the electrical grid, adjusting its power...

City of Duluth/Evergreen Energy – Hot Water System

Corval installed a new piping system for the City of Duluth, switching it from a city steam system to a city hot water system. We took the 18” supply and return piping from tie-ins located outside the main steam plant and ran the remaining piping into the plant through...

NRG – Vikings Chilled Water Distribution

Corval was awarded the interior and exterior construction packages to provide chilled water from the NRG Main Plant to US Bank Stadium. The interior package consisted of coordinated tie-ins at the main plant and approximately 600’ of welded 24” pipe. Once complete, the exterior package was begun from the...

Great River Energy – Spiritwood Station

Corval was the general contractor for this power plant in Spiritwood, North Dakota. Our scope of work included structural steel erection, boiler assembly, and equipment setting. We also installed packaged boilers and performed mechanical piping services, including ASME pipe services....

University of Minnesota Morris – Wind Turbine

Corval Group was the mechanical contractor selected to erect a Vestas V82 wind turbine near the University of Minnesota’s Morris campus. The project was completed in some of Minnesota’s toughest winter conditions. Temperature dipped close to -30 degrees F followed by a 22” snowfall. Despite the adverse conditions, the...

Abengoa-Solana – Solar Power Plant

Corval fabricated and installed high pressure piping for Abengoa-Solana’s solar power electric generating facility in Arizona. This unique Concentrated Solar Power (CSP) 280 MW plant has an electrical output of 250 MW and is oversized by 70% to ensure the plant will achieve 100% coverage during the summer’s peak...

Metropolitan Council Environmental Services (MCES – Non Condensing Steam Turbine Generator

Metropolitan Council Environmental Services (MCES) awarded Corval Group to be the General Contractor for the addition of a 750 KW non-condensing steam turbine generator set including associated turbine generator control panel in the Solids Management Building (SMB). Scope of work included addition of Generator Interconnection Circuit Breaker in existing...

Hutchinson Utilities Commission – Unit 5

Corval was the general contractor hired by Hutchinson Utilities Commission for the installation of Unit 5, a Wärtsilä 20 V34SG gas-fueled engine of a nominal 9.4 MWe. We installed the generator set, complete with all structural, mechanical, electrical, and emissions control systems, as well as equipment, necessary controls, and...

Xcel Energy – Black Dog Plant

Corval was the prime contractor for the installation of a Siemens 501CT, a Deltak HRSQ, and a Westinghouse steam turbine in an existing power plant. Our additional scope included the demolition of an existing coal-fired boiler....
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