Renewables solves this.
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Gas power generation is a necessary evil to balance out the variability of intermittent energy generation (i.e. wind and solar).
Hydropower isn't a feasible alternative because the easy resources have been developed.
The only alternative source of flexibility available today is demand side response.
Edit: I appreciate the down votes, as I've not explained in detail. It is a complex issue. My opinions are based on having a phd in the topic, 10+ years in control rooms, years of market operations and design, and years contributing to europe-wide risk assessment methodologies.
I emplore anyone who is actually interested in how energy mix actually impacts grid stability/reliability to look into the Eirgrid DS3 programme (https://www.eirgrid.ie/ds3-programme-delivering-secure-susta...).
If prices continue to drop, there will be a powerwall alike in every second house in some years.
It also does nothing to help transmission grid frequency stability and control.
they dont help grid stability via inertia of spinning masses, but PLLs and the like exist, where you can control frequencies and phases without a spinning mass.
you dont need to burn gas to have a flywheel either