Yes exactly. In the UK power is becoming increasingly negative in pricing when there is high wind + solar output. This is actually increasingly alarmingly rapidly (and there is 3-5GW of offshore wind, plus loads of utility scale solar coming online).
Prices are then very high when wind and solar is low - which happens to be when demand is the highest (cold weather snaps in winter which tend to result in very low windspeeds).
National Grid is already paying £1bn/yr to turn off wind farms when supply is too high (plus paying a fortune for new nat gas peakers, which are limited by law to run for 10 days a year max). It's projected that curtailment payments to wind farms will reach £4bn/yr.
While some of this will be rectified with more transmission capacity (there is a 4GW offshore HVDC link being built between scotland and england), if the claims of terraform are true and hold up at scale, I think this is the actual breakthrough people have been looking for.
These could be connected to substations near wind farms (which also happen to be near major gas interconnectors from the north sea) and generate when power prices were low or negative, which will be a large amount of the time. They'd then get paid not only for the arbitrage in gas prices but also they would be able to take (most/all) of the curtailment payments national grid is paying the wind farms.
To be clear batteries do not work particularly well for a market like the UK. Batteries work well for overnight storage of solar, they do not work well for northern climates like the UK that require weeks of storage of power to cover low renewable output in winter. That's not to say there isn't loads of batteries being constructed right now, there is, but it's to cover very short term movements in supply and demand - the much harder problem is covering days or weeks of low output.