Achieving the world's most economical stored solar kilowatt-hour requires domestic battery chemistry patents and long-duration thermal storage.
India has achieved some of the world's lowest solar electricity generation tariffs; however, grid integration is constrained by storage costs. Relying on imported lithium-ion battery cells creates a new balance-of-payments vulnerability. Domestic technological leadership requires patent ownership in sodium-ion chemistry, flow batteries, and long-duration pumped thermal storage.
Ten-year milestone: achieve the lowest levelized cost of stored solar electricity in the world, governed by domestic battery chemistry and storage patents.
| Energy storage metric | Current domestic standard | Ten-year sovereign milestone |
|---|---|---|
| Levelized cost of stored solar | 8 to 10 rupees per kWh | Under 3.5 rupees per kWh stored |
| Battery cell manufacturing IP | Imported foreign cell licenses | Indigenous sodium-ion and solid-state cell technology |
| Grid-scale storage duration | 2 to 4 hours (lithium-ion) | 12 to 24 hours (long-duration thermal and flow storage) |