The whole notion of the powerwall is based on the assumption that either utilities or consumers are irrational. If buying a powerwall was at all economical, uti

The whole notion of the powerwall is based on the assumption that either utilities or consumers are irrational. If buying a powerwall was at all economical, utilities would buy them in bulk, charge them on wholesale power, alter their pricing structure, and make a larger margin than you ever could. If powerwalls aren't economical, the only reason they make sense is to capitalize on consumers who are willing to buy the thing because its cool, or because they like living "off the grid". Utilities also have access to utility-scale energy storage -- pumped hydro, thermal, etc -- which is far cheaper than consumer focused powerwalls.