EPEX SPOT and EEX · Glossary

EPEX SPOT and EEX are organised trading venues for electricity and energy-related products in Europe. They belong to the same corporate group but cover different time horizons. EPEX SPOT is responsible for short-term electricity trading, that is, for the day-ahead market and the intraday market. The European Energy Exchange (EEX), based in Leipzig, is mainly known for the forward market. There, electricity futures and other contracts are traded, with which market participants secure prices for future delivery periods. The EEX also trades natural gas and freight products and auctions emission allowances under the EU Emissions Trading System.

Company and owners

EPEX SPOT is operated by EPEX SPOT SE, a European company (Societas Europaea) headquartered in France (Paris). It is subject to rules set at European level. 51 percent of the capital is held by the EEX Group, which belongs to Deutsche Börse. The remaining 49 percent is held by HGRT, a holding company of the transmission system operators Amprion, APG, Elia, RTE, Swissgrid and TenneT. In addition to a management board and a supervisory board, EPEX SPOT has an exchange council and its own market surveillance. Spot trading used to be part of the EEX. In 2008/2009 it was transferred to EPEX SPOT, which was founded jointly with the French exchange Powernext. The widespread statement that the day-ahead price is determined at the "Leipzig power exchange" is therefore no longer accurate.

What is traded: energy volumes in fixed time windows

On these exchanges, electricity is traded as a quantity of energy, usually in megawatt hours (MWh). One megawatt hour corresponds to a power of one megawatt delivered or consumed for one hour. A contract specifies how much energy is delivered in which period and in which market area, and how settlement takes place. For quarter-hour products, the quantity of energy within 15 minutes is what matters. A quarter-hour contract for 1 MW therefore comprises 0.25 MWh. The exchange does not replace grid operation. Feed-in and withdrawal must be physically balanced at every moment, even though trades are concluded in time blocks.

Day-ahead market: daily auction, in quarter-hours since October 2025

In the day-ahead market, sellers and buyers submit bids on the previous day for the following delivery day. The European day-ahead markets are coupled in the Single Day-Ahead Coupling (SDAC). A common algorithm calculates the bids of all participating bidding zones together and takes into account how much transmission capacity is available between the zones. The day-ahead price is therefore not a national administered price. It is the result of a rule-based European auction procedure. On trading day 30 September 2025 (delivery day 1 October 2025), the SDAC switched from hourly to quarter-hour intervals. Since then, day-ahead prices have been calculated for every quarter-hour. The basis for this is the EU Electricity Market Regulation (EU) 2019/943.

Intraday market: continuous trading and auctions

The intraday market is closer to the time of delivery. Here, forecast errors and short-term changes can be balanced out. This is important because wind and solar power depend on the weather, consumption forecasts are never exact, and plants can fail unexpectedly. At European level, intraday trading runs via Single Intraday Coupling (SIDC). Trading is continuous there, and since 13 June 2024 there have additionally been three Europe-wide intraday auctions per day. These auctions also put a price on cross-border capacity in the intraday timeframe. The closer delivery comes, the more trading revolves around concrete balancing needs. A balance responsible party adjusts its schedules, a direct marketer corrects the forecast of a wind farm, and a storage operator exploits price differences between quarter-hours.

EEX and the forward market: hedging rather than forecasting

On the EEX forward market, electricity volumes are traded for future delivery periods, such as weeks, months, quarters or years. Many electricity futures are settled purely financially, some also with physical delivery. These products serve primarily to hedge prices. A supplier limits its future procurement costs, a generator secures its revenues, an industrial company reduces its price risk. A forward price is not a reliable prediction. It contains expectations, risk premiums, effects of market liquidity and the hedging needs of the participants. Anyone who reads forward prices as a forecast overlooks what the market is for: it shifts risks between market participants.

Settlement and clearing

Exchange trading only works if participants trust the rules, the data and the settlement. Many trades on the EEX and EPEX SPOT are settled and secured via European Commodity Clearing (ECC) of the EEX Group. A clearing house acts as central counterparty between buyer and seller. This means that not every trader has to bear the default risk of all others itself. More on this in the entry Clearing.

A power exchange is not the same as the electricity market

EPEX SPOT and EEX do not represent the entire electricity market. A large share of electricity is traded off-exchange: through OTC transactions, bilateral supply contracts or long-term purchase agreements such as the Power Purchase Agreement. In addition there are balancing energy markets, redispatch, balance group settlement, grid charges and state support or levy mechanisms. Several exchange operators (NEMOs) also work within the European market couplings. EPEX SPOT is an important operator, but not the only one in every market area.

The exchange price is often equated with the household electricity price. However, the end-customer price contains, besides procurement costs, also grid charges, taxes, duties, levies, sales costs and risk margins. Suppliers usually buy in staggered tranches over longer periods and hedge on the forward market. A falling day-ahead price therefore does not immediately reach households, except with dynamic tariffs. The exchange itself also does not generate electricity. It does not decide on power plant availability, grid expansion, fuel prices or weather. It provides rules, trading platforms, auction procedures and settlement. Prices arise from the bids of market participants.

Price formation, bidding zone and grid

Within a bidding zone, there is in principle a uniform wholesale price for each delivery period. Germany forms such a zone together with Luxembourg. A bidding zone is a trading zone and does not represent every line. If a lot of wind power is fed in in the north while consumption in the south is high, the exchange price nevertheless remains uniform. Grid operators then have to resolve bottlenecks within the zone through redispatch. The costs for this do not appear in the exchange price but are essentially passed on via regulated grid charges. As a result, low exchange prices and high congestion costs can occur at the same time. Whether the configuration of the bidding zones reflects actual bottlenecks well enough is a matter of European and national regulation. The exchanges do not decide on this alone.

Negative prices are often misunderstood. A negative day-ahead price does not mean that electricity is worthless or that the system has failed. It shows that in this period a lot of generation that can hardly be curtailed at short notice meets too little demand or flexibility. Technical minimum outputs of power plants, heat extraction, support rules, forecast uncertainty and limited storage contribute to this. Negative prices thus signal a lack of absorption capacity, flexibility or grid capacity.

Significance for renewable energy and flexibility

The more wind and solar power there is in the system, the more important the short-term markets become. At midday, photovoltaics pushes prices down; in low-wind evening hours they rise. The switch to quarter-hours is intended to reflect such fluctuations more accurately. For flexibility, this creates revenue opportunities: battery storage, flexible industrial processes, electrolysers, heat pumps with storage or controlled charging of electric cars can react to price differences. A price signal alone, however, does not create flexibility. Installations must be controllable and metering must be right. Balancing rules and grid charges must allow flexible behaviour, and small consumers need suitable tariffs and automation.

The EEX has a different role in the energy system. The more spot prices fluctuate, the more important the question becomes of who bears the price risk: generators, suppliers, industry, traders, the state or consumers. Futures and long-term contracts distribute this risk but do not eliminate it. Those who hedge pay for predictability. Those who lock in their revenues give up possible gains if prices rise later. In summary: EPEX SPOT matches generation and consumption in the short term in fixed delivery periods, while the EEX organises the handling of future price risks. Neither market on its own explains security of supply, end-customer prices or grid expansion costs.

Sources

Governance — EPEX SPOT SE; unbekannt. Abschnitte EPEX SPOT SE und Shareholder Structure
Successful Implementation of 15-Minute Market Time Unit (MTU) in SDAC — EPEX SPOT / SDAC-Parteien; 2025-10-07. Pressemitteilung, Einleitung und Abschnitt About SDAC
Intraday Auctions on SIDC — ENTSO-E; unbekannt. Abschnitte The Goal of IDAs und The IDA Solution
European Energy Exchange (Mitgliedsprofil) — Europex; unbekannt. Abschnitte About eex und Traded commodities
EU electricity trading in the day-ahead markets becomes more dynamic — Europäische Kommission, GD Energie; 2025-10-01. Nachrichtenmeldung, gesamter Text

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Edited by eCMS on 11.11.2026 19:47