Electricity rates for Norwood residents and businesses will decline by 3 percent on bills after Sept. 1. Selectmen, in their role as light commissioners, voted to adjust the rates at their July 23 meeting. Light Department superintendent Malcolm McDonald said the new rates will apply to 13,133 residential, 1,936 commercial, and 49 industrial customers. He estimated it was the first time rates have gone down in more than a dozen years. The average residential customer currently pays $77.86 a month. After the reduction, the average bill will be $75.52, a reduction of $2.34. Total savings to customers, including money put into a stabilization account, is estimated at $1.6 million.