As a counter, this article (https://spectrum.ieee.org/energywise/energy/renewables/what-energy-storage-would-have-to-cost-for-a-renewable-grid https://spectrum.

As a counter, this article (https://spectrum.ieee.org/energywise/energy/renewables/what-energy-storage-would-have-to-cost-for-a-renewable-grid https://spectrum.ieee.org/energywise/energy/renewables/what-...) says aim for 95% renewables requires battery costs of $150/kWh.