Utilities set demand charges based on a building’s highest 15-minute interval of energy use every month. For many air-conditioned buildings, this sudden spike often happens when the “smart” thermostat turns on all the air conditioners at the same time instead of gradually.

Here’s what that looks like on a hot summer day:

And this is what those demand charges would look like on your utility bill: 

Demand bill.png

While solar can off-set energy charges, it cannot off-set demand charges. Look at the utility bill below to see what this looks like for your bottom line.


DemandEx is software that adds automated building energy intelligence to your air conditioner. Here’s the result after installing DemandEx software: