We don't need to suggest alternatives here. The market is already supplying them. Yes, long-term storage is expensive. But there are options: Overprovisioning,

We don't need to suggest alternatives here. The market is already supplying them. Yes, long-term storage is expensive. But there are options: Overprovisioning, hydropower, thermal storage if you just need to heat up houses, thermal-electric storage if you need the electricity, biomass (plants store the energy). Thermal and thermal-electric storage is still in its infancy, but if you show up with the need and the money, you could buy a plant to be installed in a year or two.