INDIANAPOLIS (AP) — The company that plans to sell produce synthetic natural gas from coal in southern Indiana and sell it to the Indiana Finance Authority might need to refund to customers every three years if the energy source costs too much, according to legislation introduced in the Indiana Senate.

Republican Sen. Doug Eckerty of Yorktown told the Indianapolis Business Journal for a story Tuesday (http://bit.ly/W5z2Cv ) that his bill is aimed at addressing concerns by consumer groups and others about a 2010 law supporting the $2.8 billion Indiana Gasification LLC plant proposed for Rockport.