The Power Badger® is an easily implemented and proven Energy Efficiency Measure employed nationwide by public utility companies, Demand Side Management Program Managers, DSM consultants and 3rd party energy efficiency program implementers. This heater controller has the ability to provide significant kWh savings through its built-in temperature adjusted power cycling function. Calculations for kWh savings vary by climate zone. This energy saving device is particularly effective in areas where winter temperatures swing through a wide range during the transitional seasons leading into and out of the main heating season (spring / fall).
Below is the link to a (large) 3rd party data file produced by The Regional Technical Forum (in Oregon) relating to block heater controllers, https://rtf.nwcouncil.org/measure/engine-block-heater-controls/ . It shows the specific backup data used for the Rocky Mountain Power efficiency measure (in UT, ID & WY) that BMI / The Power Badger® has been involved with for several years now.
The kWh savings are dramatic and there is data to back it up. Similar technical studies may be available from other Regional Technical Forums for other climate zones. BMI would encourage and likely cooperate with any future studies.