Answer:
All matter, including rocks and their constituents, can be a source of energy. If a rock drops from an altitude, as would a meteorite, it is imbued with "kinetic energy," just like a bullet from a firearm.
A rock may also contain minerals that after they are extracted may yield chemical elements that could yield "thermodynamic energy" as part of chemical reactions.
A rock may also contain atoms that could be used in fission or fusion processes that could produce the type of thermonuclear and fusion energy that occurs in atomic explosions and in the Sun, respectively.