Here are the numbers in chart form. In the article above they mention coal, solar, solar wirh storage, wind, and wind with storage. Wonder why there was no mention of natural gas when discussing costs?
https://pv-magazine-usa.com/2018/03/12/worlds-largest-batteries-hiding-in-colorado-bids/
Wind with storage 21/MWH
Solar with storage 36
NG with storage 6.20 (combustion gas turbine )