Voltmasters Platform
Spanish time-of-use periods
The Fixed (Spain, time-of-use) contract type: the six tariff periods, the seasons, the public holidays and the injection price.
In Spain, fixed tariffs are not a single price. Under CNMC Circular 3/2020 (Iberian Peninsula), every quarter-hour is classified into one of six tariff periods, from P1 (most expensive) to P6 (cheapest), and each period has its own price. This contract type lets you enter one fixed price per period; the platform automatically applies the correct period to each quarter-hour based on the date and time.
This contract type only appears in the dropdown for projects whose country is set to Spain.
You enter six prices (€/MWh), one per period P1–P6. The period that applies to a given quarter-hour depends on three factors, evaluated in Spanish local time (Europe/Madrid):
1. Day type
- Weekends and national holidays → the whole day is P6.
- Working days → the period depends on the season and the hour (below).
2. Time block (working days)
| Block | Hours | Result |
|---|---|---|
| Peak | 09:00–14:00 and 18:00–22:00 | Peak period for the season |
| Shoulder | 08:00–09:00, 14:00–18:00 and 22:00–24:00 | Shoulder period for the season |
| Valley | 00:00–08:00 | Always P6 |
3. Season (by month)
| Season | Months | Peak block → | Shoulder block → |
|---|---|---|---|
| High | January, February, July, December | P1 | P2 |
| Medium-high | March, November | P2 | P3 |
| Medium | June, August, September | P3 | P4 |
| Low | April, May, October | P4 | P5 |
In practice this means a working day uses three prices, the night/valley (P6) plus the season's peak and shoulder period, while a weekend or national holiday uses a single price (P6).
The national holidays that count as all-day P6 are the fixed-date Spanish electrical holidays:
| Date | Holiday |
|---|---|
| 1 January | New Year's Day |
| 6 January | Epiphany |
| 1 May | Labour Day |
| 15 August | Assumption |
| 12 October | National Day |
| 1 November | All Saints' Day |
| 6 December | Constitution Day |
| 8 December | Immaculate Conception |
| 25 December | Christmas Day |
Movable feasts without a fixed calendar date (Good Friday, Holy Thursday, etc.) and regional/local holidays are not treated as P6, they follow the normal working-day rules, in line with the CNMC fixed-date definition.
Injection. Under these Spanish contracts, energy is not sold back to the grid, so the injection price is always 0.
The underlying spot data for Spain is sourced from the ENTSO-E transparency platform (the Spanish bidding zone), which reflects the same day-ahead market outcome as OMIE. For a fixed time-of-use contract the spot price is not used for pricing, only the tariff period of each quarter-hour matters.