$\textit{Active Energy}$ is the electrical energy transformable into some other form of energy.
Applicable units are those of quantitykind:Energy
http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=601-01-19
"Active Energy" is the electrical energy transformable into some other form of energy.
$W = \int_{t_1}^{t_2} p dt$, where $p$ is instantaneous power and the integral interval is the time interval from $t_1$ to $t_2$.
http://www.iso.org/iso/catalogue_detail?csnumber=43012