Justice William E Powers Building, which houses the Rhode Island Department of Administration, on Sunday. The audit began in February when several state agencies raised questions about increased energy costs. Rhode Island Energy — the state’s dominant energy supplier — overcharged the state by $2 million over a three month period last year, according to a recent audit by the state. The audit, published by the Office of Internal Audit and Program Integrity, found that Rhode Island paid around $6.1 million dollars for electricity and gas usage between August and October last year. RIE, which manages electricity distribution for 99% of the state, said that no bills were miscalculated and that the state was not overcharged.