Glossary – Definitions
Intermittent renewable energies and electricity supply system

Appoint ; Back-up

Electrical power that must be added to or subtracted from that of intermittent renewable energies to deliver the power required by the remaining load.

Charge ; Load

Power setpoint assigned to generating facilities to ensure power system balance. A distinction is made between :

• the full load, which must be provided by all generating facilities, grouped together in the complete mix;

• the remaining load, i.e. the part of the load that remains to be covered once the contributions of hydro, nuclear and biomass generation have been taken into account. This is provided by the partial mix, which includes intermittent renewable energies (wind and solar), fossil energies and possibly storage; the partial mix follows the remaining...