Though pumped hydro is sometimes opposed by environmental groups because it does absolutely decimate local environments.

I have high hopes for sodium batteries. The ones that have been released on the market are simply perfect (if scaled up) for local grid storage in countries with a lot of space and will hopefully get better energy density in line with Lithium Iron Phosphate with time.

Salt batteries have been the cold fusion of battery tech for like 10 years, but now it is finally coming to fruition. I hope to install a solar installation with salt batteries in 5 years or so, myself.