The Indiana Utility Regulatory Commission has approved Indianapolis Power and Light's request for a $70 million investment into their Harding Street plant to transition another unit from coal to natural gas.
IPL said in a release the investment would go to eliminate coal burning and revamp the Harding Street Plant unit so it will be capable of burning natural gas.
The process will help IPL comply with EPA standards limiting coal-fired power plant emissions.
Indiana Office of Utility Consumer Counselor spokesman Anthony Swinger says the OUCC, which is a state agency that acts as a consumer advocate, has been supportive of phasing out coal at this plant and is still reviewing the case.
"We were generally supportive of the utilities request when it came to the conversion of Harding 7 and the other aspects of this particular case," Swinger says.
Last year IPL converted two other units to natural gas.
IPL says it plans to reduce its dependence on coal by 44 percent by 2017.