Giant water batteries could make green power reliable

> returns on that investment are uncertain. “Bankers and investors and utilities are thinking, ‘I know there’s a great value here, but can I quantify it?’

Maybe it's time to stop thinking like this. If it means that carbon-free power can be generated /and/ it can supply vast amounts of power for millions of people then it should be done. The usual ditherers need to understand that ROI will not save the planet - and bankers - from a slow and unpleasant death.

Again, breakground solution. Within 20 days.

For ecological purpose, just go nuclear.