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Re:Renewables became the second-most prevalent U.S. electric... by throw0101a on Thursday July 29, 2021 @07:49AM (#27995352)
> Gas is much cheaper per joule than electricity.

There is actually a tip-over point. For a given price for gas, and a given price for electricity, each will be more economical at different points because the efficiency of heat pumps (for heating) is a function of the external temperature.

There are calculations that can be done to determine this point:

* https://c03.apogee.net/mvc/home/hes/land/el?utilityname=ever...

* https://masslandlords.net/heat-pump-vs-furnace/

It's not as clear-cut as you make it sound:

* https://en.wikipedia.org/wiki/Coefficient_of_performance

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