On July 23, more than 640,000 Baltimore Gas and Electric Co. residential customers with smart meters installed in their homes earned $2.5 million in bill credits by voluntarily participating in the first Energy Savings Day of the summer, BGE announced on Tuesday. Customers who participated received an average credit of $6.80. An Energy Savings Day typically occurs on hot summer weekdays when homes and businesses are using higher amounts of electricity, especially air conditioning. BGE anticipates that there will be five to 10 Energy Savings Days per summer. BGE customers with smart meters can participate in the BGE Smart Energy Rewards program by reducing their electricity usage to earn a bill credit of $1.25 for every kilowatt-hour saved from 1 p.m. to 7 p.m. on the designated days. Eligible customers will be notified, usually the evening before an Energy Savings Day, by an automated phone call and email.