Evidence from Two Large Field Experiments that Peer Comparison Feedback Can Reduce Residential Energy Usage.

Ayres et al. (2012)
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Summary by 
Mark Egan

The authors analyze data from two large-scale, random-assignment field experiments conducted by utility companies providing electricity and natural gas in partnership with Opower, which provides monthly or quarterly mailed peer feedback reports to customers. They find reductions in energy consumption of 1.2% to 2.1%, with the decrease sustained over time.