Indiana Michigan Power (I&M) has received an approval from the Indiana Utility Regulatory Commission (IURC) for an agreement to use the dry sorbent injection (DSI) technology at its Rockport Generation Plant to meet environmental standards.
The DSI technology is a two-step process, under which a powdered sorbent such as sodium bicarbonate is fed into the flue gas as it exits the plant and reacts with emissions, and then an electrostatic precipitator or a fabric filter removes the compound, the company claims.
The company will require an approximately $258m investment to deploy new environmental retrofit technology, whereas the traditional dry scrubber would have cost around $1.4bn.
The IURC's decision comes on the heels of the Indiana Department of Environmental Management's approval on 27 August 2013.
Earlier in February 2013, I&M had signed the agreement with the Indiana Office of Utility Consumer Counselor, the US Environmental Protection Agency and a group of its industrial customers to use the low-cost technology at the 2,640MW coal-fired power project.
In addition to this, I&M agreed to add 200MW wind power capacity and to retire or refuel some coal-fired units with natural gas as part of the February 2013 agreement.
As such, the company has signed a contract to purchase 200MW of electricity annually from a wind farm planned for Winchester, Indiana, and announced plans to retire an older coal-fired plant in Lawrenceburg.
Located at 791 N US Highway 231, Rockport, Indiana, the plant features two 1,320MW units, which were brought online in 1984 and 1989, respectively, and are connected to the American Electric Power system by two 765kV transmission lines, Rockport-Jefferson and Rockport-Sullivan circuits.