A stored surplus of fuels is a reserve 1
Estimated quantity of energy source (such as coal, gas, or oil) known
with reasonable certainty to exist, and which can be recovered with
presently available technology at an economically viable cost. Energy
reserves are projected on the basis of geologic and engineering data
(proved reserves) and projection drawn on the basis of proved reserves
For foodstuff and other materials, then referring to it as a stockpile would be more appropriate. 2
- A supply of material, as a pile of gravel in road maintenance.
- A large supply of some metal, chemical, food, etc., gathered and held in reserve for use during a shortage or during a
period of higher prices.
- A quantity, as of munitions or weapons, accumulated for possible future use.