[Tobba_]

Not necessarily, 1.3MJ (360 Wh; but screw that unit) of diesel isn't much of an explosive under normal circumstances. It really depends on the maximum power output under normal operation, and whether it can occur uncontrollably.

[dredmorbius]

Energy density and release rate tend to have inverse relations, for a given energy mechanism.

TNT has about 1/10 the energy density of petrol or diesel. Capacitors have lower capacities than batteries.