Northern Indiana utility customers held a rally Thursday night to oppose NIPSCOs plans to raise their rates while allowing industrial customers to access lower market prices.

The Merrillville-based utility announced Friday that the wind farms would be in Benton, Montgomery, Warren and White counties and have nearly 300 wind turbines.

NIPSCO expects the move to mostly renewables would cut carbon emissions by 90 percent.

Northern Indiana Public Service Co. serves about 820,000 natural gas customers and 460,000 electric customers across 32 counties.

The Merrillville-based utility says the demolition of its Dean H. Mitchell power plant and the site's environmental cleanup will cost an estimated $18 million.