Listen to what I'm saying here
Yeah, I heard you the first time. Repeating yourself doesn't amplify your point. Try actually citing some evidence against the solutions presented, rather than flatly declaring them to be unworkable, because clearly I disagree.
- "inefficient": 80% sounds fine to me. 20% extra capacity is hardly insurmountable, and less so as prices drop further. Consider that coal plants are only 33-40% efficient, yet somehow they're workable.
- "environmentally messy": I doubt anything you could cite here comes slightly close to the disaster that is fossil fuels, from mining through refining and transport to burning them into pollution and CO2.
- "do not scale": Pumped hydro is obviously grid-scale. Flow batteries can be arbitrary capacity. Flywheels, supercaps etc can be added in any quantity desired, needing only space (and can even be underground). Many of these options can also scale down to something a consumer could purchase and use, giving additional decentralisation and redundancy.