HELENA, Mont. -

 A proposal to add hydroelectric dams to the list of renewable resources eligible for energy credits is back before the Montana Legislature.
    
Energy suppliers must meet 15 percent of their customers' demand with renewable power.
    
Butte Democratic Sen. Jim Keane says hydroelectric fits the description of a renewable resource like wind and should be included.
    
PPL Montana is backing the measure as it finishes up a $240 million expansion of its Rainbow Dam near Great Falls.
    
Montana Public Radio reports that Kyla Maki of the Montana Environmental Information Center says the point of the renewable standard is to encourage diversification.
    
A similar bill was vetoed in 2011 by Gov. Brian Schweitzer.
    
Keane's bill has passed the Senate and was heard Monday in the House Federal Relations, Energy, and Telecommunications Committee.