Something here it not computing. They said Ethereum energy consumption is similar to the Netherlands. This would mean a single coal planet can power the Netherlands 35 times over. Some numbers are definitely wrong here.
A terawatt is a trillion watts (or a billion kilowatts), so no, you're out by 3 orders of magnitude and Ethereum ceasing to use PoW would be the equivalent of losing the need for 30-40 typical coal power plants (or a handful of the world's largest coal power plants)
Those numbers don't look right. A plant running at 90% uptime is ~8000 h/yr, and a typical large power plant produces 100s of MW. So you should be looking at a yearly output in ~1000s GWh/yr range.
