Exact energy savings number is always a lie

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Exact energy savings number is always a lie

Every time I hear somebody say “project saved $123,456” I look if person’s nose has grown a bit.

Obviously such person does not understand the first thing about savings: energy savings is consumption that did not happen, nobody can measure something that did not happened.

Energy savings are never exact, always an estimate. Always.

“Project saved 123,456 kWh” is always a false statement.

It’s possible to register past consumption as an exact number, because it happened. Savings reflect something that did not happen. It’s consumption avoided. It’s impossible to determine it exactly, it is only possible to estimate savings. This uncertainty can be accounted for by reporting a low end of an estimate or by reporting a range.

Responsible statements are:

Project saved at least 123,456 kWh or

Project saved 123,456 ±X with certainty Y%.

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