When the electricity utility type is selected, the annual compressed air consumption is converted to electrical energy use using the compressor specific power scaled by the compressor control adjustment factor. The control adjustment is expressed as a percentage (0–100) and is divided by 100 to obtain a dimensionless multiplier. Dividing by 60 converts the per-minute basis of the specific power to a per-hour basis consistent with the consumption units.

\begin{equation}\label{eq:compressed-air-reduction-electricity} E = \frac{P_{specific} \cdot \frac{f_{control}}{100}}{60} \cdot C\end{equation}

Symbols

\(E\)	Annual electrical energy use \([\unit{ \kilo\watt\hour\per\year}]\)
\(P_{specific}\)	Compressor specific power (electrical power per 100 scfm) \([\unit{ \kilo\watt\per\cubic\foot\per\minute}]\)
\(f_{control}\)	Compressor control adjustment factor \([\unit{ \percent}]\)
\(100\)	Percentage-to-fraction conversion \([\unit{ \unitless}]\)
\(60\)	Unit conversion factor (minutes per hour) \([\unit{ \minute\per\hour}]\)
\(C\)	Annual compressed air consumption \([\unit{ \cubic\foot\per\year}]\)