In what is not so much a forecast as an article, leading energy analyst group Wood MacKenzie said this week that the global energy storage market would grow from approximately 4GW of annual deployments in 2019 to more than 15GW in 2024. Alarm bells went off with us immediately. Surely it meant 15 GWh, and surely wasn’t that way too low? After a frantic back and forth between us and the press office they refused to bend – “We checked with the analysts, it was from 4 GW to 15 GW, now leave us alone.” So we have to guess what it means, which is likely that it is enough storage to drive a capacity of 15 GW of output…