Energy Savings Calculator

Where the savings actually come from

Replacing an appliance saves the difference between old and new consumption, multiplied by how much it runs. That second term is what decides whether a swap is worth doing: an inefficient device used twice a week saves almost nothing, while a modest improvement on something running continuously pays back quickly.

Standing loads first

Fridges, freezers, circulation pumps, ventilation and anything else running around the clock are where the largest savings sit, precisely because the hours are so high. Lighting and cooking usually matter less than people expect, and heating usually matters more.

Savings and solar together

Every kilowatt-hour removed from consumption is a kilowatt-hour the array does not have to generate and the battery does not have to store. Efficiency work is almost always cheaper per kilowatt-hour than the equipment that would otherwise be needed to supply it, which is why it belongs before the system design, not after.