Energy was last better‑than‑free: yesterday Next

On the Agile Octopus tariff, customers get paid to use electricity when there’s too much in the grid.

That’s cheaper than Octopus Energy paying to store it.

The price changes every half-hour.

How free electricity works

Period

Region

Negative prices (weekend)

Sat 20 Sep · Sun 21 Sep

What caused it · More notable days

Saturday 20 Sep 2025 · half-hourly prices

South Eastern England

Price for each half-hour
Negative price (you’re paid to use power)

Stats for Saturday 20 Sep 2025

−2.3p

Cheapest half-hour 11.30pm – 12am

34.1p

Dearest half-hour 5.30pm – 6pm

0.5 hours

Negative prices 11.30pm – 12am

6.8p avg

Cheapest 3 hours 9pm – 12am

19.4p

Average price on 20 Sep 2025

Show as a table

Time	Price
12am – 12.30am	19.7p
12.30am – 1am	18.5p
1am – 1.30am	18.0p
1.30am – 2am	17.8p
2am – 2.30am	18.3p
2.30am – 3am	17.8p
3am – 3.30am	18.5p
3.30am – 4am	17.5p
4am – 4.30am	16.8p
4.30am – 5am	16.8p
5am – 5.30am	18.0p
5.30am – 6am	17.6p
6am – 6.30am	18.5p
6.30am – 7am	18.5p
7am – 7.30am	17.6p
7.30am – 8am	20.7p
8am – 8.30am	23.1p
8.30am – 9am	23.6p
9am – 9.30am	23.0p
9.30am – 10am	23.8p
10am – 10.30am	21.9p
10.30am – 11am	22.1p
11am – 11.30am	20.3p
11.30am – 12pm	20.3p
12pm – 12.30pm	20.2p
12.30pm – 1pm	20.1p
1pm – 1.30pm	20.3p
1.30pm – 2pm	19.0p
2pm – 2.30pm	19.4p
2.30pm – 3pm	17.3p
3pm – 3.30pm	18.3p
3.30pm – 4pm	19.4p
4pm – 4.30pm	29.4p
4.30pm – 5pm	30.2p
5pm – 5.30pm	32.9p
5.30pm – 6pm	34.1p
6pm – 6.30pm	33.8p
6.30pm – 7pm	34.0p
7pm – 7.30pm	18.5p
7.30pm – 8pm	19.6p
8pm – 8.30pm	17.3p
8.30pm – 9pm	15.5p
9pm – 9.30pm	16.2p
9.30pm – 10pm	10.2p
10pm – 10.30pm	9.7p
10.30pm – 11pm	5.3p
11pm – 11.30pm	1.8p
11.30pm – 12am	−2.3p