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Eighteen transmission system operators in the European Core region began a new afternoon calculation for cross-border intraday electricity trading on Oct. 14, 2026. Its updated capacities apply to delivery from 6 p.m. to midnight and may create additional trading opportunities, but the effect on renewable generators and battery revenues will depend on grid conditions and market prices.
Eighteen transmission system operators in Europe’s Core region launched an additional afternoon calculation of cross-border electricity trading capacity on Oct. 14, 2026, adding updated capacity figures for intraday trades in the evening. The procedure, called Intraday Capacity Calculation (IDCC(e)), is intended to make more efficient use of available grid capacity and give traders another opportunity to respond to changing wind and solar forecasts.
The new calculation covers trading between European bidding zones on the delivery day. According to documentation cited by Energy Storage, results are made available through the Joint Allocation Office (JAO) publication tool at about 4 p.m. each day. They apply to delivery hours from 6 p.m. to midnight and feed into coupled European intraday trading.
The process uses flow-based capacity calculation. Rather than considering only the rated capacity of individual cross-border links, it accounts for potential power flows across the connected transmission grid. The aim, according to the report, is to determine the capacity available for cross-border trade while maintaining operational security.
The participating operators include Germany’s four transmission system operators: 50Hertz, Amprion, TenneT and TransnetBW. Energy Storage reports that the launch completes a phased rollout of intraday flow-based capacity calculation in the region. A morning calculation, IDCC(d), had already begun operating in April 2026.
More Trading Options for Evening Power
The additional calculation gives traders a later update on the capacity available to move electricity across borders, when forecasts and grid conditions may have changed since the morning. That can matter for wind and solar power, whose output is weather-dependent and can shift during the day. Direct marketers may be able to adjust their positions in intraday markets in response to revised generation forecasts, if cross-border capacity is available.
The development may also be relevant to battery operators, which buy and sell electricity at short notice. The updated capacity figures could affect which cross-border trades are feasible, but the launch itself does not guarantee higher revenues or lower marketing costs. Those outcomes depend on the available capacity, market prices and the specific grid situation.
For electricity traders and renewable producers, the practical change is a further scheduled opportunity to use revised capacity information for evening delivery. It does not remove transmission constraints or guarantee that additional capacity will be available on any given day.
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From Morning Updates to Afternoon Calculations
The Core region covers Germany and other continental European countries connected through the participating transmission systems. Operators have introduced updated intraday capacity procedures in stages. The IDCC(d) process, which provides a morning update for the rest of the delivery day, went live in April 2026. The new IDCC(e) afternoon process adds another calculation later in the day, focused on evening delivery.
This staged change reflects the short time horizons of intraday electricity trading. Generation forecasts, consumption and grid conditions can change after the day-ahead market has cleared. Updated capacity calculations can inform later trades, while operators must still account for the security limits of the interconnected grid.
“The new calculation procedure for intraday electricity trading went live on Oct. 14, 2026.”
— European transmission system operators, as reported by Energy Storage
Market Effects Depend on Daily Conditions
The launch announcement does not quantify how much additional cross-border capacity the afternoon calculation will make available, or how often it will change trading outcomes. It is also unclear from the cited material whether the procedure will produce measurable changes in renewable curtailment, trading volumes, battery revenues or marketing costs.
Any benefit will depend on the specific grid situation and market conditions on each delivery day. The calculation identifies capacity available for trade under operational security limits; it does not mean that all calculated capacity will necessarily be used or that prices will move in a particular direction.
Daily Results Will Show Its Reach
The procedure is now operating, with results scheduled for publication through the JAO tool at about 4 p.m. daily. Traders and other market participants can use those figures for coupled intraday trades covering delivery from 6 p.m. through midnight.
Its practical effect will become clearer through the capacity results and market activity that follow. The source report provides no quantified forecast of added trading capacity or stated timetable for a formal assessment of the procedure’s performance.
Key Questions
What changed on Oct. 14, 2026?
Eighteen TSOs in the European Core region began an additional afternoon calculation of cross-border capacity for intraday electricity trading.
When do the new capacity results apply?
Results are published at about 4 p.m. daily and apply to delivery hours from 6 p.m. to midnight on the delivery day.
How could the calculation affect renewable power trading?
Updated capacity information may help direct marketers respond to changing wind and solar forecasts. It can open trading opportunities only where the grid situation permits them; it does not guarantee additional capacity.
Does the change guarantee higher battery revenues?
No. The source report says any effect on battery revenues or marketing costs depends on available trading capacity and the market situation.
Source: rss
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