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Battery cells have reached the 100 USD/kWh threshold at the end of 2020, and continue to decline. The new Na ion batteries are projected for 40% of the price of a Li ion battery. This will be a game changer.

I think, we need a re-calculation in 2-3 years.

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$35/kWh may be a reasonable price for a used battery sitting on a pallet somewhere. But that battery requires a whole host of sophisticated electronics to be converted to a functional "packet" (not the least of which is fire suppression), sitting on a larger pallet. the price is now say $45/kWh? A reasonable price for siteing, assembling the packets in parallel and connecting to the grid and the windfarm will double the price. Likewise, the $80/kWh new battery price is without packaging and connections. No honest person will project the installed cost "someday" at less than $160/kWh, or less than $200/kwh with new batteries, $100 kWh with used batteries for installation in 2021-2022. Hopelessly expensive, give it up: N2N. See NuScale SMR's & TerraPower, Bill Gates' molten salt reactors, both scheduled for operation yet this decade if you're afraid of CO2 (plant food), otherwise CCGT for at least the next 30 years.

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