01 / HISTORY
Notice activity over time
Published notices per day, not power outages
Margin / demand Assistance
Click any highlighted bar to inspect notices from that date. Every bar represents published messages, not independent incidents.
CONTINUOUS MONITOR / GREAT BRITAIN
When the grid needs help.
Explore published electricity margin warnings, emergency assistance notices and demand-reduction alerts. Rolling historical coverage, updated automatically.
Elexon BMRS · official SYSWARN noticesLOOKBACK · LAST 30 DAYS
Fetching published notices from Elexon…
UK LOCAL TIME · BST / GMT
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INCIDENT EVIDENCE / FOUR INDEPENDENT CHECKS
How stressed was the system?
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Waiting for published incident data.
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.
02 / CONTEXT
What do the notices mean?
NO RISK SCORE
The feed can establish when warnings were issued. It cannot, on its own, measure how close the grid came to losing supply.
03 / PUBLISHED RECORDS
Latest relevant notices
Source: Elexon BMRS SYSWARN. Times shown in UK local time.
04 / MEASURED SYSTEM FREQUENCY
How close to frequency limits?
50 Hz nominal · 49.8 Hz lower operational reference · 49.5 Hz statutory lower limit
↻ Loads when a notice day is selected
∿Waiting for a notice day
Frequency readings are fetched automatically for the selected day.
Automatic measured frequency query; no synthetic measurements.
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.
05 / HISTORICAL REFERENCE
All notice days in the last 30 days
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.
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06 / SOURCES & METHODS
Where the data comes from
ELEXON · API
System warnings (SYSWARN)
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 · FREQSystem frequency measurements
Automatically retrieved historical measurements for a six-hour window around the selected notice. Availability can vary.
API documentation ↗NESO · 14 OCT 2026Operator's incident explanation
Independent context for 9 and 12 October: wind, frequency, transmission restrictions and emergency assistance.
NESO incident statement ↗Elexon LOLPDRM de-rated margin forecast ↗ — shown for the selected warning only where published, not a measure of actual reserve or regional transmission headroom.
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.