It's the "volts of power" that throws me more than the use of 'power' to mean 'electricity'. "Carrying power at 75kV" would be fine, but I'm generally of the opinion that once you mention Volts, Amperes or Watts, you really ought to use them correctly.
But since this is the cringeworthy aritmetic thread, not the grammar one, the real error is that they say "75,000 kilovolts", when they mean 75 kilovolts / 75,000 volts. If it were 75MV it would seriously hamper the hammock-hanging efforts, on account of having reduced everything in the vicinity to plasma. Simple typo that would easily sneak past a proofreader with limited knowledge of electricity.