First we need excess energy to have a storage problem. Ignoring that, I think some market based mechanisms on the consumption side could gobble that capacity up.

If energy is a big enough input to some process like metallurgy, recycling, computation, etc in times of excess you could drop the price to the base mwh rate minus the cost of a theoretical amortized storage solution + transmission inefficiencies and give incentive to burn that capacity off.

Since we've already invented the economy, we can pass around excess money to use for on demand/scaling consumption instead of building big energy network storage and transportation and eating the cost.

In theory subsidizing scalable supplies with the fixed supplies.