BERKELEY, Calif.—Some technology policy organizations worry that smart meters pose a potential threat to privacy. The Center for Democracy and Technology and the Electronic Frontier Foundation presented their concerns in a recent filing with the California Public Utilities Commission. Digital meters can collect data 750 to 3,000 times a month. Such metering, the organizations say, will make it possible for government agencies, marketers, and even criminals to put together a picture of household life. It could be determined when the people who live there get up, when they get home, what appliances they use most and when they go on vacation.