The price for storage is closer to $500/kWh for the large utility scale projects using Teslas Megapacks and falling fast [1]. I wouldn’t be surprised to see $200-300 fairly soon (within the next 5 years). Tesla is only starting to seriously ramp up production on Megapacks. I couldn’t find reliable pricing for a project usings BYD’s new MC Cube system but Las Vegas is installing half a gigawatt hour worth of those units.

[1] 413 million dollars for 800,000 kWh = $516.25/kWh installed price.

https://carboncredits.com/tesla-413m-megapacks-revolutionize...