Actually I said that wrong those electrons don't disappear, they end up back with the water molecule, but they go the long way around powering electrical equipment in the process of getting back to the water. To throttle this you just need to feed less hydrogen. Funnily enough if you use an electrolyzer to generate high pressure hydrogen during off power hours you can then use that hydrogen to power fuel cells in a power plant that is resilient to grid cycles without reliance on wind or sun or other intermittent supplies. The issue is the catalyst is "rare" earth metal that is mostly supplied by the fucking Chinese.