Energy software company Opower has built a business off of encouraging utility customers to curb their energy consumption through detailed energy bills. But will this method work as well when it’s around time-sensitive peak grid events (like a hot Summer afternoon)? This Summer Opower says it is expanding its behavioral demand response program, where Opower’s software nudges residential customers to lower their energy consumption during peak grid events, to 1 million homes. Unlike other competitors like Nest, Opower doesn’t use a device in the home like a thermostat. Baltimore Gas and Electric, Efficiency Vermont, Consumers Energy and Glendale Water & Power are all participating.