??? Those are *input* powers of terrifically inefficient and expensive electroly... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

		mlyle on March 27, 2021 \| parent \| context \| favorite \| on: Solar Is Cheapest Electricity in History, U.S. DOE... ??? Those are input powers of terrifically inefficient and expensive electrolyzers. That 250MW plant put out 17MW of hydrogen -- (120 (megajoules / kilogram)) * ((0.000236 kilograms) / (cubic foot)) * (2 200 000 ((cubic feet) / hour)) = 17,306,667 Watts.

philipkglass on March 28, 2021 [–]

I think that you slipped a decimal point. The mass of a cubic foot of hydrogen is about 0.00236 kg, not 0.000236 [1]. That means that the output power is an order of magnitude greater than you calculated -- 173 megawatts.

[1] https://microsites.airproducts.com/gasfacts/hydrogen.html

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact