Monthly electricity market report · MIBEL

Iberian electricity market — September 2025

Day-ahead price, demand and generation mix · ESIOS and OMIE data

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Average price

61.0 €

▼ −10.8% vs August 2025

Average demand

26.7 GW

▼ −3.7% vs August 2025

Renewables

55%

▲ +0 pp YoY · CO₂-free 76%

Negative periods

128

▲ +611% YoY

Day-ahead market price

The day-ahead market averaged 61.0 €/MWh, −10.8% versus August 2025. In perspective it sits −19.3% against the 11-year September average (75.6 €/MWh): a somewhat cheap month. The year-on-year figure (−15.9% vs September 2024) is distorted by an anomalous base.

Hourly month heatmap

Hour ↑ · Day of month → -1 €/MWh · 215 €/MWh

-1 €/MWh

215 €/MWh

Daily average price comparison

Day of month · €/MWh

Demand

Peninsular demand averaged 26.7 GW, −3.7% on August 2025 and +3.5% YoY, peaking at 36.2 GW.

Hour · GW

Generation mix

On about 21.1 TWh scheduled (P48), renewables made up 55% and CO₂-free generation 76%.

Generation mix

Solar fotovoltaica

Nuclear

Eólica

Ciclo combinado

Hidráulica

Cogeneración

Solar térmica

Solar PV

23.8% +19%

Nuclear

21.4% −9%

Wind

19.1% −11%

CCGT

14.5% +36%

Hydro

8.3% −3%

Cogeneration

6.1% −4%

Solar thermal

2.1% −11%

Pumped-storage

1.7% +17%

Other renewables

1.6% +9%

Fuel / gas

0.9%

Other

0.5% +58%

Coal

0.0% −98%

Historical context

156

141

103

September · €/MWh

Methodology

Price: ESIOS indicator 600 (Spain). Demand: ESIOS indicator 1293 (peninsular). Mix: P48 schedule by technology (REE/ESIOS), best estimate at month close — metered generation is published later; the check against the most recent metered month shows differences below 1%. Peninsular scope, full calendar month.