Once installed alongside the 585 MW coal-fired unit, Alstom’s NIDTM semi-dry flue gas desulphurization system will reduce the power plant’s environmental footprint by cutting mercury emissions by 90 percent and curbing emissions of sulfur dioxide and other pollutants.
The Boswell 4 NID installation is part of Minnesota Power’s $350 million effort to make the unit fully-compliant with both state and federal regulations. This project also is a key component of the company’s Energy Forward strategy that includes further reducing emissions at its existing plants and additional generation from renewables and natural gas, creating an energy mix of 1/3 coal, 1/3 renewable and 1/3 natural gas.
By capturing multiple pollutants with a single unit, Alstom’s NID technology eliminates the need for Minnesota Power to install multiple emission control systems.
The project is pending Minnesota Public Utilities Commission approval. A decision is anticipated from the MPUC in September.
This article was originally published on Electric Light & Power/POWERGRID International. It was republished with permission.