Electricity costs are basically irrelevant because the cards are so expensive.

A100 cards consume 250w each, with datacenter overheads we will call it 1000 kilowatts for all 2048 cards. 23 days is 552 hours, or 552,000 kilowatt hours total.

Most dataceneters are between 7 and 10 cents per kilowatt hour for electricity. Some are below 4. At 10 cents, that's $53,000 in electricity costs, which is nothing next to $30 million in capital costs.