There's an irritating mix-up between power and energy throughout the article and in the tweets it's sourced from. Cannon-Brookes asks for a 100 MW (power) syste

There's an irritating mix-up between power and energy throughout the article and in the tweets it's sourced from. Cannon-Brookes asks for a 100 MW (power) system; Musk responds with a price of $250 per kWh (energy), based on a >= 100 MWh (again, energy) system. Retail price for electricity in South Australia is on the order of AU$0.30 - AU$0.40 per kWh (~US$0.23 - US$0.30), so it's presumably a typo on Musk's part; but the article repeats and compounds it by talking about Tesla supplying "up to 100 megawatt hours of power". (If I've done my sums right, 100 MWh is about the amount of electricity produced in Australia as a whole every 15 seconds, on average.)