Negative prices through the day
Research notes
Figures are for London unless they say otherwise.
What happened
London fell to −4.7p at 12:30 and was below zero for 11 hours straight from 05:00. Average 8.0p, evening peak 29.4p at 18:00.
Likely causes
- Sunday demand plus strong renewables. The only dated source says Friday's settlement reflected "weekend demand and strong renewables weighing on prompt prices". (confirmed by source, but thin) Prestige, 8 Jun 2026
- The shape of the day (negative from 05:00, deepest at 12:30, over by late afternoon) is the classic pattern of early-summer sun on a low-demand Sunday, with enough wind to keep prices under zero from dawn. It is a fortnight from the solstice. (inference)
- Wind was forecast to stay above seasonal norms into the following week. (confirmed by source) Prestige, 4 Jun 2026
Wider context that week
- Weekend military escalation between Israel and Iran put the risk premium back into gas, power and oil on Mon 8 Jun. On 10 Jun Iran attacked US bases in Jordan, Kuwait and Bahrain, "the largest escalation since April's ceasefire". Prestige, 8 Jun, Prestige, 10 Jun
- Nuclear: both Sizewell B units, Torness and unplanned outages at Hartlepool and Heysham all offline. Prestige, 8 Jun 2026
- GB demand that week was up 3.1% as the effect of the 25 May bank holiday wore off. AleaSoft, 8 Jun 2026
Confidence
Low to medium. Nothing found describes 7 Jun specifically. The explanation is general context plus the shape of the price curve.
Gaps
- No wind, solar or wholesale price figure for the day.
- A Bloomberg piece of 12 Jun reportedly said prices were turning negative "for the first time since late April" (wording from a rewrite site, not read directly). That conflicts with an 11-hour negative spell on 7 Jun in the Agile data, which cannot happen without negative wholesale prices. Bloomberg may have been referring to a particular auction or to the daily average. Not resolved. Bloomberg headline, rewrite at Techgolly