Aug. 22 — CenterPoint Energy has unveiled an unusual pilot program for “renewable natural gas,” offering customers a greener — though more expensive — alternative to conventional gas.Participants in the voluntary program would pay an extra monthly fee to get a portion or all of their gas from renewable sources such as landfills, sewage treatment plants and livestock manure. CenterPoint would buy the renewable gas from national suppliers and deliver it to homes through its existing distribution system.

— Minneapolis Star-Tribune