AC <-> DC and power distribution
Just one thing: high voltage DC is how you send power for long distances under the sea, to avoid the massive induction losses you'd get if you used AC.
It's been practical to convert DC to AC and back again on the megawatt scale since the very early days of AC power distribution. What you use is motor-generator sets, a technique that's only recently been superseded by heavy-duty semiconductors.
Biting the hand that feeds IT
