The third question (What is energy worth?) can also be more difficult to answer
than it might at first appear. In the case of electric power, savings usually translate
into a reduction of power import from the grid, so we need to know how much
the power bill changes as the electric load goes down. Conceptually, this seems easy:
We just need to know the cost of imported power in $/kWh. However, electricity
contracts can be complex. They may include demand charges and time-of-use
components, as well as various other factors, in addition to simple energy charges.
It is therefore important to understand the power contract before estimating the value
of electrical savings.
The third question (What is energy worth?) can also be more difficult to answerthan it might at first appear. In the case of electric power, savings usually translateinto a reduction of power import from the grid, so we need to know how muchthe power bill changes as the electric load goes down. Conceptually, this seems easy:We just need to know the cost of imported power in $/kWh. However, electricitycontracts can be complex. They may include demand charges and time-of-usecomponents, as well as various other factors, in addition to simple energy charges.It is therefore important to understand the power contract before estimating the valueof electrical savings.
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