Below zero this month
At least 4 hours
Coverage is incomplete, so the real total can only be higher.
Sometimes electricity pays you to use it
When there is more wind and sun on the grid than the country can use, Agile prices go below zero. Use power then and the unit rate is credited to you instead of charged. It is rare, it is measurable, and this is every time it has happened.
The record
-12.831p/kWh
at 12:30, in Northern Scotland
On a 7kW car charger, that half hour paid you about £0.45 to plug in.
Measured since .
How a negative half hour is counted
A half hour counts once nationally if Agile was below zero in any of the 14 regions. It is not counted again for each region that saw it. National totals are therefore neither sums nor averages of the regional ones — they are a different measurement, and comparing them directly will mislead you.
Below zero this year
At least 160 hours
Coverage is incomplete, so the real total can only be higher.
Below zero last year
144.5 hours
Most recent plunge
4 hours
4 September 2026, 11:30 to 15:30
The trend, month by month
How much time each month spent below zero.
Oct 2024Feb 2025Jun 2025Oct 2025Feb 2026Jun 2026Sept 2026
Every day, two years
One cell per London calendar day. Darker means longer below zero.
LessMoreNo data
MonTueWedThuFriSatSun
MonTueWedThuFriSatSun
MonTueWedThuFriSatSun
The biggest plunges
Open one to see the shape of the dip, half hour by half hour.
Deepest in East Midlands.
Deepest in East Midlands.
Deepest in Northern Scotland.
Deepest in Northern Scotland.
Deepest in Northern Scotland.
Deepest in Northern Scotland.
Deepest in East Midlands.
Deepest in Northern Scotland.
Deepest in East Midlands.
Deepest in Northern Scotland.
Deepest in Northern Scotland.
Deepest in East Midlands.
Which regions go negative most
Regional totals never sum to the national one — a half hour negative anywhere counts once nationally.
- East MidlandsAt least 339.5 hours (incomplete)
- LondonAt least 339.5 hours (incomplete)
- YorkshireAt least 339.5 hours (incomplete)
- Eastern EnglandAt least 338 hours (incomplete)
- West MidlandsAt least 338 hours (incomplete)
- North East EnglandAt least 338 hours (incomplete)
- North West EnglandAt least 338 hours (incomplete)
- Southern EnglandAt least 338 hours (incomplete)
- Southern ScotlandAt least 338 hours (incomplete)
- Merseyside and North WalesAt least 336.5 hours (incomplete)
- South East EnglandAt least 336.5 hours (incomplete)
- South WalesAt least 336.5 hours (incomplete)
- South West EnglandAt least 334 hours (incomplete)
- Northern ScotlandAt least 331 hours (incomplete)
Know when it happens next
A double-opt-in email when published Agile rates in your region go below zero.
What these figures coverRead more
The record-low search is measured from to . Totals, trends, events and regional comparisons cover the 24 calendar months from to . Where coverage is incomplete a figure reads “at least”, because a gap can only ever make the real total higher.
Why this page can go unavailableRead more
National results use the bounded aggregate maintained alongside the tariff ingest. If that upstream aggregate is temporarily unavailable, this page fails closed rather than reconstructing national results inside the web application — a reconstructed total would be a different measurement wearing the same label.
Why Outgoing Agile has no negative pricesRead more
Every negative rate in the database belongs to Agile import. Outgoing Octopus Agile is half-hourly too and has rate history back to 2018, with no negative row at all — the export price is floored at zero. A plunge page for it would be a claim the data does not support. About Agile Octopus.