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Are you sure it was $15/MWh? That seems more than 1000x cheaper than state of the art batteries.

I just checked some prices for small scale PV farms you can plant to your house. It's 16,83 euro-cent for the PV per KWH and 23,74 euro-cent for the storage. Production is 10KWH, storage is 11KWH.

So if we (naively) multiply by 1000 we get 23,74€/MWh. And that is for the home market. I know battery storage doesn't scale linearly, but also if you were to build this as a highly-scaled farm, I'm sure prices would also drop as well.

23 euro cents * 1000 is 230 Euros, not 23. But that is still a factor of 1000 lower then the prices mentioned in https://www.nrel.gov/docs/fy19osti/73222.pdf and other web publications. Are you sure about those numbers and what kind of storage do they refer to?

That's how much the storage added to the price of power in the bid, not the capital cost of the batteries.

Oh! Thank you.

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