Less Energy

Using less energy saves money and lowers greenhouse gas emissions. And various studies have looked at ways to get households to use less energy. Now there's evidence that people in such a study use less energy...because they're in a study.The general phenomenon is called the Hawthorne effect: study subjects change their [behaviour:attitude] because they're being observed. So researchers [collaborated:cooperated] with a utility to test for the Hawthorne effect in electricity use.They [monitored:ruled] almost 5,600 randomly [selected:elected] households. Half received a postcard saying that their energy use would be monitored for a month for research purposes. They also got four follow-up reminder postcards over the month. They received no other information, instructions or incentives.The control group [monitored:watched] for the study got no notifications. That group continued using the same amount of electricity. But the families being tracked reduced energy use 2.7 percent. And when the study period ended, their energy use shot back up. The report is in the [Proceedings:Procedure] of the National Academy of Sciences.