A new ARPA-E startup is developing a battery improvement with a target price of $0.17 per watt-hour. I imagine that this price reflects current market prices for materials and so it might not reflect a revised demand scenario as we try to build large scale grid energy storage. However, if lithium batteries can be developed for this price, it seems likely that liquid magnesium (target price $0.05 per watt-hour), iron air (target price $0.10 per watt-hour) or some other advanced battery can get to a similar price point.

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