Puerto Rico Electric Authority, the last government entity to sell debt before soaring yields forced the commonwealth to curtail issuance, is focused on cutting costs by replacing oil as its primary means of generating power.

PREPA is converting its power plants to burning natural gas, which is cheaper and will help the authority to comply with tighter mercury and air toxic standards taking effect in April under the federal Clean Air Act, PREPA executive director Juan Alicea Flores said in an interview on Wednesday.

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