Recent system notices and measured frequency, alongside generating-capacity, wind and solar forecasts and potential issues for the next 24 hours.
Peak concurrent generator restrictions disclosed through REMIT during the next 24 hours, compared with annual published installed capacity.
Waiting for outage reports.
NESO's forecast embedded wind and solar generation for the next 24 hours. Transmission-connected generation is not included in these figures.
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Explore published electricity margin warnings, emergency assistance notices and demand-reduction alerts. Rolling historical coverage, updated automatically.
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Warning notices, system frequency and de-rated margin forecasts describe different aspects of the electricity system. They cannot be combined into a reliable probability of power cuts.
Published notices per day, not power outages
Click any highlighted bar to inspect notices from that date. Every bar represents published messages, not independent incidents.
The feed can establish when warnings were issued. It cannot, on its own, measure how close the grid came to losing supply.
Source: Elexon BMRS SYSWARN. Times shown in UK local time.
50 Hz nominal · 49.8 Hz lower operational reference · 49.5 Hz statutory lower limit
Frequency readings are fetched automatically for the selected day.
Frequency is a national measure, while some incidents are caused by regional transmission constraints. A frequency trace alone cannot prove how close a region came to losing power.
Every matching UK publication date in your selected lookback, sourced from the live Elexon SYSWARN feed. Select a day above or here to examine its frequency and margin data.
Automatically queried for notices within the selected 30, 60, 90, 180 or 365 days. Each record has publication time, warning type and text.
API documentation ↗ELEXON · FREQAutomatically retrieved historical measurements for a six-hour window around the selected notice. Availability can vary.
API documentation ↗NESO · 14 OCT 2026Independent context for 9 and 12 October: wind, frequency, transmission restrictions and emergency assistance.
NESO incident statement ↗Method: results are selected using the publication timestamp, not the period to which a warning relates. Related notice updates are grouped by their UK calendar date; this is not a formal incident-level grouping. Automatic refresh runs every five minutes while this page is open; it is not a background alerting service. Partial outages are labelled and never silently treated as zero events. No invented measurements, assistance volumes or blackout probability are shown.
Observed frequency, transmission demand, metered generation and Britain's combined net interconnector flow. No warning forecasts on this tab, and no invented blackout-risk percentage.
Gross imports and exports, pumping, power-station auxiliary use, and a like-for-like time window.
Observed hertz, not predicted power cuts
Measured frequency will appear here.
Fixed −10 to 40 GW axis · observed snapshots · negative interconnector flow = net exports
Metered hydro and other fuels · estimated embedded solar and wind · A–Z
Frequency is a direct system-wide observation; the gap to 49.5 Hz and the 48.8 Hz disconnection reference is measurable. It is not a reliable countdown to grid collapse. Demand is metered initial transmission-system outturn, not a forecast. Metered generation covers transmission-connected sources. Embedded wind and solar estimates are shown separately and excluded from the metered balance. Net interconnector flow sums signed published connector readings for the same settlement period; importing power does not itself mean the UK is short of supply. The accounting section compares gross imports with transmission demand and separates exports, pumping and station use when they are published.
For the fuller picture of blackout risk, publicly accessible measurements do not reliably reveal available frequency-response reserves, all regional transmission constraints or the probability of load shedding. Missing and delayed data are labelled, never treated as zero or proof the grid is safe.
14-day outlook from published electricity forecasts. Wind, solar and spare generating capacity are shown alongside known availability data. This is a forward-looking evidence dashboard
Daily published spare generating capacity and renewable forecasts, where available · UK dates
Waiting for forecast feeds.
Select Forecast to load published demand, generation and margin forecasts.
Published generation-availability outlook; planned outages affect the usable capacity
Available capacity is not electricity actually generated. A drop in declared usable output may reflect outages or other restrictions; it does not, by itself, identify a specific maintenance event.
REMIT disclosures overlapping the selected day · separate generator and interconnector reports
Installed capacity and REMIT disclosures have different reporting coverage.
Awaiting REMIT data.
Awaiting REMIT data.
These notifications cannot be subtracted from the operating-margin forecast without double-counting.
Overseas exportable surplus remains unknown: a link being technically available does not guarantee neighbouring generators have spare power or that commercial imports will be scheduled. ENTSO-E European system information ↗
Cross-border constraints need their own evidence, not a guessed percentage
Interconnector technical availability, foreign electricity demand, neighbouring wind/solar forecasts and market prices all matter. Spare generating capacity in France, Norway or another country is not automatically available for export to GB.
No reliable probability of imports being available is calculated in this release. Published spare generating capacity is not a guarantee that interconnector support will be delivered.
These inputs have different reporting boundaries and forecast horizons. Lower published spare generating capacity indicates less forecast generation headroom under that report's assumptions, but it is not a quantified blackout likelihood or a full assessment of regional transmission-security risks. Missing or stale feeds are labelled rather than filled with guesses. UTC is used for API timestamps; day labels are shown in UK local time.