The UK electricity grid is experiencing frequent excursions above the normal operational frequency limit of 50.2 Hz, indicating an imbalance between generation and demand.

UK Electricity Grid ⚡ GB grid frequency is running high this morning Since about 8am, Britain's grid frequency has repeatedly gone above 50.2 Hz, the top of the normal ±0.2 Hz operating band. My monitor logged 15 excursions between 08:00 and noon BST. The highest was 50.241 Hz at 11:54. The previous nine days had between 0 and 4 excursions each, for the whole day. What's going on? There's more power than demand. ☀️ It's a sunny Saturday. The transmission grid doesn't see rooftop solar directly, so it shows up as falling demand. National demand dropped from 22.5 GW to 17.7 GW between 08:30 and 11:30. Imports went up anyway. Net interconnector imports climbed from about 2 GW to over 6 GW, including a jump of about 2.8 GW around 8am. The first excursion came at 08:03, right on that step. 🏭 Gas is backing off, but not fast enough. Gas generation fell from 5.8 to 2.1 GW and biomass halved, but pumped storage (pumping about 1.5 GW) and batteries still had to absorb the surplus. ⏱️ About half the spikes came within 5 minutes of :00 or :30, when interconnector and generator schedules change. With average frequency sitting around 50.15 Hz, the grid's normal small swings are enough to push it past 50.2. There's a second effect too. Inertia fell from 167 to 125 GW·s as gas plant came off, so the system reacts more sharply to any disturbance. It isn't over. The 11:00 hour was the worst so far, and solar hasn't peaked yet. I'd expect more excursions until midday passes or imports are cut back. This is no cause for alarm. The legal limit is 50.5 Hz and NESO has plenty of tools to manage this. It's a good live example of how a sunny weekend changes the way the grid runs. #GBGrid #EnergyTransition #Solar #GridFrequency #g7izu

UK Electricity Grid The UK grid is flirting with a higher than normal operating frequency this morning with frequent short excursions above the normal operational limit of 50.2 Hz, indicating too much generation for the current load. The normal operational range is between 49.8 and 50.2 Hz. The statutory operating limits are 49.5 to 50.5 Hz. Automatic response mechanisms are triggered to try to absorb the excess power above 50.2 Hz. #ukgrid #g7izu