Market dynamics
Article 20 of 20 · Energy markets and market dynamicsEPEX spot price optimisation for industry: a guide for businesses
Direct answer
EPEX spot price optimisation for industry means aligning your electricity use with the EPEX day-ahead quarter-hourly prices. You shift controllable processes into cheap or negative quarter-hours and throttle back in expensive ones. Since 1 October 2025 the Dutch day-ahead market has 96 quarter-hourly prices per day, which makes this steering more precise.
- Clear definition
- Data-driven assessment
- Risks and opportunities visible
- Practical next steps
EPEX spot price optimisation for industry: scattered information versus Energy Intelligence
Electricity does not cost the same every hour. On the EPEX SPOT day-ahead market the price per time block is set by supply and demand. With plenty of sun and wind and low demand the price drops, sometimes below zero. On cold, windless evenings it rises. An industrial company with controllable demand can respond: run when power is cheap, throttle back when it is expensive. This mainly matters for businesses with cooling, heat, storage or large-scale charging.
- Day-ahead prices are known a day in advance, and since 1 October 2025 they are set per quarter-hour: 96 blocks per day.
- You need a dynamic or spot contract, a price forecast and controllable capacity that you can shift automatically.
- Flexible processes, cooling, e-boilers, batteries and charging points are the first places to move demand into cheap hours.
Insight
Traditional approach
Information is scattered across portals, documents, invoices or separate spreadsheets.
Modern approach
Data, context and interpretation are brought together into a clear decision picture.
Decision-making
Traditional approach
Choices are made based on averages, assumptions or occasional analyses.
Modern approach
Scenarios, KPIs and current measurement data make the trade-off more concrete and repeatable.
Follow-up
Traditional approach
Actions often stay non-committal or disappear into separate reports.
Modern approach
Follow-up actions, monitoring and reporting are linked to the same energy data.
How does steering on the spot price work?
The day-ahead market is a daily auction. Market parties bid supply and demand for the next day, and the exchange sets a price per time block that becomes known in the early afternoon. Since 1 October 2025 this is done per quarter-hour, so 96 prices per day instead of 24. You therefore know the prices a day ahead. With a dynamic contract that follows the spot price, you pay the rate of the block in which you consume. Optimising then means running your controllable capacity in the cheapest quarter-hours as much as possible and throttling back in the expensive ones. That requires automation, because manually steering across 96 blocks is not sustainable.
- The day-ahead price is an auction price per time block, known a day in advance.
- Since 1 October 2025 there is a price per quarter-hour: 96 blocks per day.
- A dynamic or spot contract ties your rate to that quarter-hourly price.
- Automation is needed to shift capacity reliably into cheap blocks.
- Negative prices occur with plenty of sun and wind and low demand.
What can you shift, and what do you need?
Not every process is flexible, but many companies have more controllable capacity than they think. Cold stores can pre-cool in cheap hours and then coast. E-boilers and heat buffers turn cheap power into heat for later. Batteries charge at low prices and discharge at high ones. Charging plazas can spread sessions as long as the vehicles are full in time. To use this you need four things: a dynamic or spot contract, a reliable quarter-hourly price forecast, controllable capacity with known process limits, and a control system that automatically ramps processes up and down. Start with measurement: only once you know when and how much you consume can you see where the room is.
- Cooling and heat buffers store energy as temperature and thus shift demand.
- Batteries and e-boilers charge or run precisely in the cheap quarter-hours.
- Charging of vehicles or equipment can be spread within the available time.
- You need a spot contract, a quarter-hourly price forecast and controllable capacity.
- Without measurement of your consumption profile, optimisation is guesswork.
Link with imbalance and grid congestion, and the pitfalls
Steering on the spot price is not separate from other signals. TenneT settles imbalance per quarter-hour: one imbalance price per quarter-hour, published afterwards. The underlying signal, the current system balance, does move in real time and indicates the direction. Those with controllable capacity can, through a recognised market party, also respond to imbalance. In areas with grid congestion the grid operator may instead ask you to throttle back at certain moments. These signals can reinforce one another, but can also conflict. So watch the pitfalls. A spot contract brings price risk: in expensive quarter-hours you pay the high price if you still have to run. Process limits, such as a minimum run time or a temperature limit in cooling, constrain what you can shift. And steering without good measurement leads to wrong decisions.
- TenneT settles imbalance per quarter-hour; the system balance itself moves in real time.
- With controllable capacity you can respond to imbalance through a recognised market party.
- In a congestion area the grid operator may ask you to throttle back at certain moments.
- A spot contract means price risk in the expensive quarter-hours.
- Process limits and poor measurement are the biggest practical constraints.
Curious what this looks like with your own data?
In a no-obligation call, a specialist looks at your meters, sites and energy questions with you. Response within one business day.
Search the knowledge base
Find the answer to your question.
Search using your own words. Abbreviations and spelling variants are recognised, so EMS also finds the articles on energy management systems.
Topic
