Short Term Operating Reserve (STOR) Availability Window
Glossary
Short Term Operating Reserve (STOR) are energy balancing reserves National Grid calls upon from STOR providers during STOR Availability Windows (SAW). National Grid splits the year in a number of seasons and specifies the period in each day (working and non-working days) where STOR providers can be called upon to deliver STOR; this period is known as the STOR Availability Window (SAW).
STOR Availability Window – 1 April 2024 to 1 April 2025
The table below displays the STOR Availability Window for the period 1 April 2024 to 1 April 2025. Non-Working Days (NWD) apply to all Sundays and all Bank Holidays and Public Holidays in England and Wales.
| STOR AVAILAIBILITY DATES | WORKING DAY | NON-WORKING DAY | |||||
| SEASON YEAR | SEASON NUMBER | FROM DATE | TO DATE | START TIME [GMT] | END TIME [GMT] | START TIME [GMT] | END TIME [GMT] |
| 2024-2024 | 1 | 01/04/2024 04:00 | 29/04/2024 04:00 | 05:00 | 12:00 | 09:00 | 13:00 |
| 2024-2024 | 1 | 01/04/2024 04:00 | 29/04/2024 04:00 | 18:00 | 21:00 | 16:30 | 21:00 |
| 2024-2024 | 2 | 29/04/2024 04:00 | 19/08/2024 04:00 | 05:30 | 13:00 | 09:30 | 12:30 |
| 2024-2024 | 2 | 29/04/2024 04:00 | 19/08/2024 04:00 | 15:00 | 21:00 | 16:30 | 21:00 |
| 2024-2024 | 3 | 19/08/2024 04:00 | 23/09/2024 04:00 | 05:30 | 12:00 | 09:30 | 11:30 |
| 2024-2024 | 3 | 19/08/2024 04:00 | 23/09/2024 04:00 | 15:00 | 21:00 | 16:30 | 21:00 |
| 2024-2024 | 4 | 23/09/2024 04:00 | 21/10/2024 04:00 | 05:00 | 12:00 | 09:30 | 12:00 |
| 2024-2024 | 4 | 23/09/2024 04:00 | 21/10/2024 04:00 | 16:00 | 21:00 | 16:30 | 21:00 |
| 2024-2025 | 5 | 21/10/2024 04:00 | 20/01/2025 05:00 | 06:00 | 13:00 | 10:30 | 13:30 |
| 2024-2025 | 5 | 21/10/2024 04:00 | 20/01/2025 05:00 | 16:00 | 20:30 | 16:00 | 19:30 |
| 2025-2025 | 6 | 20/01/2025 05:00 | 01/04/2025 04:00 | 06:00 | 13:00 | 10:30 | 13:00 |
| 2025-2025 | 6 | 20/01/2025 05:00 | 01/04/2025 04:00 | 16:30 | 20:30 | 16:30 | 20:00 |
Latest STOR Availability Window – CSV files