Duke Energy responds to heat wave by firing up older, dirtier coal plants
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Duke Energy to close 2 old coal-fired power plants
Regulators order Duke, Progress to disclose deals
Duke Energy CEO committed for Fla. settlement- South Carolina clears way for Duke Energy-Progress merger
Duke Energy CEO meets with environmentalists who are 'disappointed'
Duke-Progress merger approved with minor conditions 
NC Utilities Commission approves merger of Duke-Progress Energy - Duke Energy closes merger with a surprise at CEO
