Another unwelcome side effect of not knowing your average monthly kWh usage level is that you may end up paying more than you expect. This can occur when a customer inadvertently shops an electric rate based on a higher usage level than they actually use. Electricity suppliers commonly advertise their electric rates associated with the highest (2000 kWh) usage levels since those tend to be the lowest rates.

In 2016, for example, they correctly called the recovery in oil prices but failed to foresee that clean energy investment would fall. Funds flowing into the sector were 18% lower than the previous year at $287.5bn, although they estimate that about half of the drop was due to lower costs rather than a decline in activity. A slowdown in the Chinese market was the other major factor.

Twenty-nine states have deregulated electricity, natural gas or both. That allows you to shop for the supply portion of your bill from alternative providers who may offer rates lower than the default supplier – usually a utility. Delivery services and billing will remain the responsibility of the local utility as they own the power lines and wires that keep the lights on.