>>[Even] 5gw in a [60gw] peak load system is massive.
What you originally wrote is also true, but for normal operating conditions:
This would save Texians so much money by not having to use natural gas peakers (but the generators' owners, themselves, are making bank... so they ARE incentived to use nat.gas), and each facility makes BANK when the Texas grid is peaking at 80GW+ (e.g. 2021 winter storms, the costliest natural disaster in Texas' history, would have been entirely avoidable == buy electricity from the rest of America).
After the 2021 storm, the top-rate for a MWH was reduced -66% (but is still orders of magnitude more expensive than normal ERCOT operating compensations; the Texas power grid operators are incentivized to tax the grid maximally).