The spot market price is the wholesale price of electricity for short-term delivery. The spot market includes day-ahead and intraday trading. An unambiguous price quotation requires at least the market area or bidding zone, delivery interval, and specific market or price index.
Spot Market Prices at a Glance
- Auction prices, individual trade prices, and price indices must be distinguished.
- The usual unit is €/MWh: 100 €/MWh equals 10 ct/kWh.
- Price differences can create economic opportunities for battery storage systems and flexible loads.
How Are Spot Market Prices Formed?
Prices are determined by supply and demand. Auctions establish a common market-clearing price per delivery interval and bidding zone from buy and sell bids; in continuous trading, prices arise from individual transactions.
| Market segment | Meaning of the price |
| Day-ahead auction | Price per delivery interval and bidding zone for the following day |
| Intraday auctions | Price per delivery interval and bidding zone within each auction |
| Continuous intraday trading | Individual transaction prices that can differ for the same delivery interval as trading progresses |
Electricity consumption, photovoltaic and wind generation, power plant availability, and cross-border transmission capacity influence price levels.
Spot market prices differ from retail electricity prices, contractual feed-in remuneration, and balancing reserve and imbalance prices. Negative spot market prices do not automatically mean free electricity for consumers.
How Do Energy Management Systems Use Prices?
An energy management system (EMS) can use price time series to schedule battery charging during cheaper periods, discharge later, or shift flexible loads. This requires controllable equipment, suitable interfaces, and compliance with operating limits such as state of charge and grid connection capacity.
Whether this generates savings or trading revenue depends on the electricity supply or marketing contract. A fixed electricity tariff generally does not directly pass through short-term wholesale price fluctuations. The relevant factors are the actual electricity purchase costs and export revenues, including applicable price components, storage losses, and degradation costs.
How Can This Be Implemented with EcoPhi?
For implementation with EcoPhi, each project must establish which price time series or external schedules can be integrated and used for local asset control. Price visualisation in monitoring and connections to specific electricity marketing partners also require confirmation.
Displaying prices and energy flows alone does not constitute active optimisation. This additionally requires suitable control interfaces and configured EMS logic. Technical integration does not automatically provide direct power exchange access or include trading and settlement services.
Frequently Asked Questions on Spot Market Prices
How Does an EMS Use Changing Electricity Prices?
An EMS can charge a battery during lower-cost periods, discharge it when electricity costs are higher, or shift flexible loads to more favourable times. This requires suitable price data, controllable assets, compatible interfaces, and configured control logic.
Does Price-Based Optimisation Automatically Generate Savings?
No. The economic result depends on the applicable purchase and export prices, contractual price components, storage losses, battery degradation costs, and the flexibility of the connected assets. A fixed electricity tariff generally does not directly reflect short-term wholesale price fluctuations.
Does an EcoPhi Integration Include Electricity Trading?
No. EcoPhi can integrate suitable price signals or external schedules for local asset control on a project-specific basis. However, technical integration does not automatically include market access, electricity trading, billing, or settlement services.