If plumbing problems inside your home haven't caused the increased energy usage, the problem may be inside the well itself.
Sediment buildup is one of the most common causes of increased well energy usage. If excessive amounts of silt, sand, and other solid deposits make their way into your well water, the well pump will have to use significantly more energy to filter them out of your water supply.
Sediment problems can severely damage well pumps and may contaminate your home's water supply if not taken care of. Sediment buildup is commonly from damage to well screens (the interior walls that prevent your well from collapsing) but can be caused by a variety of other problems, as well as natural environmental changes.
However, other common problems may cause excessive well energy usage. Important components inside your well pump, such as the check valve or the pressure sensor, can cause significantly increased power and water usage if they malfunction. Your well's pressure tank may be waterlogged (if it has one), or the pump itself may leak water.
If your well uses too much energy and you have ruled out home plumbing problems as the culprit, you should inspect your well with a professional well inspection and repair service as soon as possible. These services will be able to diagnose and repair any malfunctions that increase your well's energy needs and safely remove any excessive sediment buildup.