Royal Decree 88/2026 opens the door to independent aggregators in Spain, but the system’s resilience hinges on two fronts: hybridizing existing renewable energy parks and increasing storage capacity behind the industrial meter.
Opinion piece by Iván Olivares, CEO of Vector Energy. Published in the magazine “Energía” no. 152 of El Economista, April 30, 2026.
One year has passed since the Iberian blackout of April 28, 2025. The public debate remains anchored in two main areas: more firm generation capacity and a larger transmission network. These are legitimate discussions, but they avoid addressing the root cause. What broke down that Monday was not just the capacity to generate or transmit electrons; it was the capacity to store energy and respond in milliseconds when the system lost synchronization. And that capacity, in a mix with over 65% renewable energy and increasingly saturated radial grids, cannot continue to rely on a handful of synchronous power plants and interconnections with France.
Spain has done its homework on renewable energy capacity: we will close 2025 with over 45 GW of solar and 32 GW of wind installed. The problem is that we have built generation capacity without the corresponding storage infrastructure that makes it dispatchable. The result is two dysfunctions: renewable energy fed into the grid at zero euros at midday—over 3 TWh in 2025 according to industry estimates—and gaps at nightfall that are filled with expensive gas. The additional cost of technical constraints exceeded €1.4 billion last year. This is a tax paid by the consumer for not having deployed storage at the same pace as generation.
Hybridizing the existing renewable energy stock
The first and most urgent step is to add BESS (Battery Energy Storage Systems) to existing solar and wind farms. We are talking about assets already built, with their connection point and permits: co-locating a battery takes advantage of existing submerged infrastructure and transforms an intermittent generator into a partially dispatchable resource. The reasonable ratio for photovoltaics in the Iberian Peninsula is 1 MW/2 MWh for every 4-5 MWp installed. This allows for shifting production to peak hours—where prices can increase fivefold—reducing grid inflows, and capturing revenue from ancillary services.
The economy is no longer an obstacle. The price of LFP modules has fallen by 40% in two years and is now below €120/kWh at the system level. With the average arbitrage value of the Spanish pool in 2025 and the expected revenue from secondary and tertiary energy sources, the payback period for hybridization is in the 5-7 year range. What continues to hinder deployment are administrative delays and the lack of regulatory clarity on how to handle hybrid access: two points of contention that have been pending resolution for three years and cannot remain unresolved.
Industrial Energy Storage Behind the Meter
The second area of focus is distributed energy storage at industrial customer sites: batteries ranging from 200 kW to 5 MW installed behind the meters of factories, industrial parks, and logistics centers. Spain has more than 28,000 industrial supplies with a capacity exceeding 450 kW. Each one represents a potential flexibility node that the current grid does not reach.
In March, Royal Decree 88/2026 was published, which transposes the figure of the independent aggregator and unlocks the participation of distributed resources in balancing markets. Now, a 1 MW battery at an industrial plant can—without the energy supplier being the obligated intermediary—provide secondary and tertiary regulation and fast frequency response. If only 5% of Spain’s industrial sector installs its own energy storage, we are talking about an additional 3-5 GW of dispatchable capacity, connected at low and medium voltage, with response times of less than 500 milliseconds.
Three Functions No Combined Cycle Can Replicate
Both approaches—utility-scale hybridization and BESS behind the meter—provide the system with three currently underserved capabilities. First, fast frequency response: a lithium battery responds in tens of milliseconds, two orders of magnitude faster than conventional synchronous inertia. In a system with fewer turbines spinning, this speed is not a luxury: it’s the difference between a recoverable voltage dip and zero. Second, islanding and restoration: thousands of nodes capable of operating in isolation for hours accelerate recovery from days to hours. Third, local decongestion: absorbing surplus energy where it is currently fed into the grid and delivering it hours later relieves pressure without the need for new lines that take a decade to build.
The regulator has done its part; now it’s time to implement.
Royal Decree 88/2026 resolves the regulatory aspects of distributed energy. The price of batteries does the rest. What’s still lacking is execution capacity: qualified electrical engineers, integrators who understand both the customer and grid sides, and an industrial chain capable of sustaining operation and maintenance for fifteen years. As a Spanish manufacturer of inverters and BESS, we see it every week: projects with quotes fluctuating by 60% among suppliers and lead times from six to eighteen months. The market needs to consolidate around players with real industrial capacity and local commitment.
Three things should happen before April 28th. First, Red Eléctrica and the CNMC must publish the technical requirements and guarantees applicable to independent aggregators—without operating rules, Royal Decree 88/2026 remains merely a title. Second, hybridization procedures must be unblocked with clear criteria and short deadlines; the largest deployment of BESS at zero incremental network cost is within reach. Third, large industrial companies must incorporate storage into their investment plans, as they did with photovoltaics five years ago.
The blackout cost between 400 and 800 million euros in direct losses. Investing a portion of that amount in storage—hybridized within the renewable energy sector and distributed behind the meter—is, quite literally, profitable. A year later, the question isn’t whether Spain needs more storage capacity; it’s how much longer we can afford not to.
Iván Olivares, CEO of Vector Energy
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