Renewable energy is taking off at exponential rates, putting global clean power "in line with ambitious net-zero scenarios." A new report suggests fossil fuel demand in the energy sector has already peaked, and "will be in freefall" by 2030.
Renewables surprisingly “on track” to meet net zero by 2050::undefined
The US (which is where I assume you are), has the second largest one in the world in current operation:
https://en.wikipedia.org/wiki/Bath_County_Pumped_Storage_Station
Short answer, it scales fine.
Now you need to find someone to pay for it.