Can I compare the British and Danish prices directly?

Not as like for like. Great Britain’s figure is an imbalance price, Denmark’s is a day-ahead auction price and Australia’s is a real-time dispatch price; each answers a different question.

Why do the U.S. rows show only demand?

The board publishes a price only from a source whose licence allows republication. For the U.S. grids it shows EIA-930 demand, which is public data.

What does a dash mean?

The market does not publish that figure, or not in a form we may republish. It is not a zero.

Why do the rows show different times?

Each source publishes on its own schedule: every five minutes in Australia, every half hour in Great Britain, hourly with a delay in the U.S. Every row shows its own as-of time.

Grid recap · Friday 30 October 2026 (UTC day)

Published 00:30 UTC on 31 Oct 2026 from data as then available; later operator revisions are not applied.

Electricity used on 30 Oct, by market

TW718,777D MWh 36.1D %
GB713,573D MWh 35.8D %
NSW148,894D MWh 7.5D %
QLD140,008D MWh 7.0D %
DK112,772D MWh 5.7D %
VIC107,046D MWh 5.4D %
SA28,947D MWh 1.5D %
TAS22,461D MWh 1.1D %

Partial day, not in the totals: PJM 79D %, MISO 79D %, ERCOT 79D %, SPP 79D %, ISO-NE 79D %.

Cheapest hour SA 14:30–15:30 ACDT · −67.27D AUD/MWh

Most expensive hour DK1 17:00–18:00 CET · 2,590.26D DKK/MWh

Below zero SA 9 h 15 minD · VIC 8 h 10 minD · TAS 6 h 45 minD · NSW 5 minD · QLD 5 minD

What happened on 30 October

Prices fell below zero in 5 markets on 30 October: South Australia for 9 h 15 minD, Victoria for 8 h 10 minD, Tasmania for 6 h 45 minD, New South Wales for 5 minD and Queensland for 5 minD. The longest unbroken run was in South Australia, 3 h 00 minD from 13:40–16:40 ACDT; the lowest price there during the day was −A$119D/MWh. The run sat inside local daytime hours, when rooftop and utility solar in the NEM is producing. This site does not publish a generation mix for the NEM regions, so the solar and wind share in those intervals is not shown. Denmark DK1 spiked to DKK 2,590/MWhD (about 387D USD/MWh) in the hour from 17:00 CET, above our fixed threshold of 300 USD/MWh.

Denmark had the cleanest mix of the grids we meter, 38.9D % renewable over the day, with wind at 29.1D % and solar at 9.8D %. Great Britain followed at 33.4D % renewable with wind 19.9D % (transmission-metered; solar on local networks is not in this data). Taiwan followed at 16.9D % renewable with wind 7.6D % and solar 7.7D %. 1,992,477D MWh was used across the 8D fully metered markets; Taiwan alone took 36.1D %.

Time below zero across all markets added up to 24 h 20 minD, more than the 19 h 15 minD on 29 October. New South Wales went below zero after staying positive the day before. Against 29 October, demand moved most in Queensland (+0.2D %) and Victoria (−7.9D %). Denmark's renewable share fell by 10.6D points, from 49.5D %. Great Britain's renewable share rose by 7.8D points, from 25.6D %. Taiwan's renewable share rose by 2.8D points, from 14.1D %. The cheapest hour anywhere cost about −47D USD/MWh, against −95D on 29 October.

How to read this. The 30 October recap covers 15D markets (8D with a full day of demand) and was frozen at 00:30 UTC on 31 October; later operator revisions are not applied. A D badge marks a number we calculated from the operators' metered data, an M badge one published as is. Durations add up priced intervals below zero, clock times are each market's local time, and shares are energy-weighted over the day. Definitions and limits are in the methodology.

ⓘ How this recap is made

Built once after the UTC day ended, then frozen. Electricity used is the metered demand of each market added up over the day (Great Britain: transmission generation); only markets with at least 95 % metered coverage of the day are added up. Hours are UTC hours priced as the mean of the source periods. Below zero is the sum of priced intervals under zero. Nothing is estimated or filled in.

ⓘ Sources & licences

Source: Australian Energy Market Operator (AEMO), NEMWEB (licence); Source: U.S. Energy Information Administration, Hourly Electric Grid Monitor (EIA-930) (licence); Contains BMRS data © Elexon Limited copyright and database right 2026 (licence); Source: Energinet (www.energidataservice.dk); Taiwan Power Company 2026 台灣電力公司各機組發電量即時資訊(含外購電力) / 台灣電力公司今日系統供需狀況 — Open Government Data License: https://data.gov.tw/license. Derived numbers and charts: CC BY 4.0, SolarCostData Data Desk. Source data keeps its own licence.

Not for trading or operational decisions. Provisional data.