The Naval Energy Storage increases your energy storage capacity by 6000 and can be built underwater.

Great for powering weapons that consume large amounts of energy.

It's also useful for storing excess energy for later use, and reducing energy stalls when wind speed is low or if you lose your generators.

Beware its heavy damage and high AoE when destroyed—or take advantage by deliberately building it as a bomb to be self-destructed if enemies get too close!