There is so much energy left over that we are using the reservoirs like giant batteries

Not long ago, the news in Spain was the dust, the dry land and the anguish of starving reservoirs. Today, the story has taken a turn as violent as it was unexpected. The background sound in the Spanish electrical system is no longer the drought alarm, but the roar of the floodgates opening to release excess water.

What the meteorology has given in the form of torrential rains during this beginning of 2026 has become a financial paradox: there is so much energy left over that the market, designed to manage scarcity, has begun to show its seams in the face of abundance. The price of electricity has not only dropped; has been broken.

A perfect storm. And this time, literally. A succession of Atlantic storms (Goretti, Harry, Ingrid…) and an extraordinarily rainy start to the year They have brought the hydraulic reserve to 77.3%. This scenario has forced hydroelectric plants to work on a piece-rate basis. It is not an option: many are “flow-through” plants, which means they cannot store water and must turbine it to avoid overflows, flooding the electrical grid with cheap energy.

This situation has drawn two opposite realities. On the one hand, for households with a regulated (PVPC) or indexed rate, the saying “year of snow, year of goods” is literally fulfilled. The bill plummets thanks to the massive entry of renewables. On the other hand, nuclear energy, designed to operate 24/7 as a base load, has become the collateral victim.

The technical data of Red Eléctrica corroborate this trend. In the generation records of February 12, it is observed how nuclear energy remains on a flat line of about 5,770 MW, but operating in an environment where wind energy exceeds 17,000 MW at peak hours, pushing prices down and displacing other technologies.

The mechanics of a “broken” market. The excess of water and wind has caused the price of electricity to “break” during the hours of lowest consumption. We’re no longer just talking about the solar “duck curve” at noon; now zero or negative prices also appear at dawn. According to The Spanishin the first ten days of February, 69 hours were accumulated with zero or negative prices.

The system is so saturated with energy that it needs “sponges” to absorb it. Here pumping hydroelectricity comes into play (using electricity to raise water from a lower reservoir to a higher one), which acts as the system’s large battery. REE reports They are revealing about it.. During the early hours of February 12, the system recorded massive pumping consumption to prevent the collapse of the network, reaching consumption values ​​(energy withdrawn from the network) greater than 1,800 MW:

• At 04:05 on February 12, pumping consumption was -1,850 MW.
• At 04:55 hours, it remained at -1,848 MW.

This confirms that Spain is using its reversible reservoirs to “drink” the excess electricity produced by wind and flowing water while demand sleeps.

An x-ray of the price. As a result, the wholesale price has plummeted. According to Expansionthe average price for this February 13 is €4.38/MWh in the wholesale market (pool), a ridiculous figure compared to previous years.

However, the market presents a time “trap” for the consumer. Although the average is low, the volatility is extreme. OMIE graphs show a flat curve close to zero for almost the entire day, which shoots up vertically at dusk.

• The valley: On February 12, the price remained practically flat and low for most of the day.
• The peak (The forbidden hour): When the sun goes down and the photovoltaics stop providing, and coinciding with dinner, the price skyrockets. Between 8:00 p.m. and 9:00 p.m. the most expensive section is concentratedexceeding €35/MWh in the wholesale market, which translates into more than €170/MWh for the final consumer due to tolls and system charges.

For the intelligent consumer, the “bargain hours” are now between 3:00 p.m. and 4:00 p.m. (with negative prices in the pool of -€0.03/MWh) and during the early hours of the morning.

Forecasts. Is this an anecdote or a trend? The experts consulted by The Energy Newspaper, like Javier Revuelta from the consulting firm AFRYthey believe it is structural. Futures markets (forwards) for March and April are already trading lower (€40 and €25 respectively).

The forecast is that 2026 will close with an average price of around €55/MWh. This strongly reopens the energy debate: if renewable energy is capable of covering demand at zero prices, the economic viability of maintaining the nuclear park—which cannot stop and start at will—becomes complicated.

The “problem” of full reservoirs is, in reality, the sign that the marginalist electricity market creaks when the raw material is free and abundant. For the citizen, the lesson is clear: electricity is almost free, but only if you know how to look at the clock before turning on the switch.

Image | freepik and freepik

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