It happens all over the place. The problem with electricity is that the marginal cost of adding capacity to the grid is very expensive, and you only hit peak capacity a few days a year.<p>For a decade or more New York has paid commercial and industrial customers something like $50M to shut down capacity on demand in exchange for lower electric rates.<p>Doing that delays or avoids $500M investments in power plants. Time shifting and solar build on this idea.<p>If you live in the boonies where power interruption is routine, partial power preservation means your fridge, well pump and heat continue to work. You don&#x27;t need to worry about frozen pipes in the winter when your on vacation or lost groceries after a thunderstorm in the summer.