AleaSoft Energy Forecasting, April 24, 2026. The recent evolution of the electricity system in Europe, and particularly in Spain, is showing that the growth of renewable capacity can no longer be analysed in isolation. In a context characterised by the expansion of solar photovoltaics, the growing need for storage and the emergence of new intensive demand, the interaction between photovoltaics, batteries and data centers introduces new keys to understanding the balance of the electricity system, price formation and the viability of investments.
The current phase of the energy transition no longer depends solely on installing more renewable energy production capacity. The determining factor is the system’s ability to coherently integrate production, flexibility and demand. In this new environment, analysing these three elements separately may lead to an incomplete view of the real challenges facing the electricity system.
Photovoltaics and concentration of production in solar hours
Solar photovoltaic energy has become one of the main pillars of renewable development. Its competitiveness and rapid deployment have driven a very significant increase in its share within the production mix. However, this growth has also intensified a structural signal in electricity markets: the concentration of production during the central hours of the day.
When this increased production is not accompanied by sufficient storage capacity, network development or new demand capable of absorbing these volumes, imbalances arise. These translate into lower captured prices, a higher frequency of zero or negative prices and increased photovoltaic cannibalisation. This behaviour does not call into question the role of photovoltaics, but it does highlight that its development alone is not enough to sustain the balance of the electricity system.
Batteries and their role in managing flexibility
In this context, battery storage is becoming increasingly important. Its contribution is not limited to shifting energy from lower‑price periods to higher‑value hours; it also enables the management of volatility, reduces curtailment, improves the utilisation of renewable energy production and strengthens the flexibility of the electricity system.
The lack of sufficient storage can exacerbate the effects of solar concentration, erode the revenues of renewable energy projects and hinder the financing of new investments. Conversely, the incorporation of batteries allows renewable energy production with a rigid profile to be transformed into a more manageable asset, with greater capacity to capture value across different markets.
In this sense, batteries are no longer merely a complement to production but are becoming one of the essential elements for the efficient integration of photovoltaics and for adapting the electricity system to a price structure increasingly dependent on hourly spreads.
Data centers as new structural demand
The evolution of demand adds a new dimension to this analysis. In a system with more renewable energy production, it is not only relevant how electricity is produced, but also how, when and where it is consumed. Within this framework, data centers represent a new structural demand capable of modifying the balance between supply and demand.
Due to their high consumption intensity and management potential, data centers can help absorb renewable surpluses, facilitate the integration of new production capacity and provide more stable demand in a system characterised by greater hourly variability. At the same time, their growth introduces new challenges in terms of network planning, access and connection, and coordination with the development of renewable energy production and storage.
The relevance of this new demand lies not only in its volume, but in its capacity to become a balancing factor within the system. In the absence of demand accompanying the growth of production, market signals may lose efficiency and increase pressure on the profitability of renewable assets.
A balance that depends on system integration
The evolution of the electricity system therefore points towards a logic in which renewable energy production, storage and demand must be developed in a coordinated manner. Photovoltaics provide clean production, batteries provide flexibility and data centers can provide structural demand capable of improving the integration of the whole.
This framework introduces greater complexity into the analysis of electricity markets, where price developments can no longer be interpreted solely from the supply side. The system’s balance increasingly depends on coordination between production profiles, storage capacity, network development and the structure of demand.
In this context, the challenge is not only to continue increasing renewable capacity, but to build an electricity system capable of efficiently integrating all the elements required for its operation.
Analysis of electricity markets and the role of storage in the next webinar
On May 21, 2026, at 10:00 CET, AleaSoft Energy Forecasting will hold the 66th webinar in its monthly series, where the recent evolution of European electricity markets and the role of storage in the current context will be analysed.
During the session, the interaction between renewable energy production, storage and demand will be examined, as well as its impact on market dynamics, price formation, revenue estimation and project viability. In particular, the opportunities associated with batteries in an environment of increased volatility and widening hourly spreads will be analysed.
The webinar will feature the participation of Alejandro Diego Rosell, consultant and specialist in the electricity sector, together with Oriol Saltó i Bauzà, Associate Partner at AleaSoft, and will be moderated by Alejandro Delgado Fornaguera, Associate Partner at AleaSoft. The session in Spanish will include a round-table discussion to explore current electricity system dynamics and the factors shaping its short‑ and mid‑term evolution.
In this context, AleaSoft Energy Forecasting provides forecasts of prices, demand and renewable energy production that enable the analysis of electricity market behaviour across different time horizons. These forecasts are essential for financing renewable energy and storage projects, structuring PPA contracts, asset valuation and designing hedging strategies in an environment characterised by greater complexity and volatility.
Likewise, the analysis of battery revenues in spot, intraday and balancing markets, together with the assessment of hybridisation strategies with renewable energy, provides a more comprehensive view of the role of storage in the electricity system and its impact on decision‑making.
Source: AleaSoft Energy Forecasting.