The race to build a “smarter” electrical grid could have a dark side. Security experts are starting to show the dangers of equipping homes and businesses with new meters that enable two-way communication with utilities. There are many benefits to upgrading the nation’s electricity networks, which is why a smart-grid movement was already revving up before the recent economic recovery package included $4.5 billion for the technology. Smarter grids could help conserve energy by giving utilities more control over and insight into how power flows.