The signal
Battery projects with four or more hours of storage are increasingly common as prices fall. Newer technologies aimed at even longer durations are in early deployment.
Where it could lead
The more solar a grid has, the more it needs storage to cover evenings and nights. Longer storage is what turns cheap daytime solar into reliable around-the-clock power.
Evidence that would strengthen the case
- Utilities routinely procure long-duration storage in planning
- Costs keep falling for longer-duration systems
- Market rules pay batteries for reliability, not just short bursts
What could prevent it
- Supply-chain or safety problems slow battery deployment
- Gas plants stay cheaper for covering nights
- Market rules don’t reward longer storage