Spain’s CPPA market is entering a new phase, shaped less by growth and more by the consequences of that growth. Solar has been deployed at an extraordinary scale in the last few years. With more than 55 GW installed, solar is now the largest power source in Spain, and today renewables account for approximately 70% of total capacity. What is increasingly clear is that this scale is starting to reshape the system.
Grid access has become a critical bottleneck, with tens of gigawatts of projects competing for limited connection rights, including over 25 GW of battery projects in the queue. At the same time, the power market is becoming increasingly saturated during solar hours. Spain has moved from rapid build-out to a system characterised by frequent zero and negative price periods, with monthly averages falling below €20/MWh, while intraday spreads have widened to more than €150/MWh between low and high-price hours.
It’s not how much you produce, but when you produce it
For corporates, the shift is tangible: it means that pure solar CPPAs are no longer an obvious solution. Downward exposure is concentrated in low-value daytime hours, while demand sits increasingly in evening peaks, where prices remain at high levels. As a result, contracts are evolving. Buyers are asking for shaped delivery, peak coverage, and solutions that reflect how power is actually consumed, reinforced by the move to 15-minute pricing across European markets.
Developers, meanwhile, are adapting to the same reality from the supply side. In a saturated solar market, generating more volume is no longer sufficient. Co-locating batteries with solar assets is becoming an increasingly important strategy to shift output into higher-value periods and stabilise revenues. This is supported by policy direction as well, with Spain targeting 22.5 GW of energy storage by 2030, signaling that flexibility will be central to the future system.
Flexibility and structuring now define the market
This shift is directly impacting how projects are financed and brought to market.
In a system defined by volatility, negative pricing, and widening spreads, stable revenue profiles are harder to achieve. Hedging is no longer an optional add-on, but a prerequisite for financial close, with lenders placing increasing emphasis on downside protection and cashflow stability.
This is where batteries and battery-linked financial structures are changing the equation, and where expertise in structuring and optimisation becomes critical.
Solutions such as TBx swaps allow developers to capture value from day-ahead price spreads while maintaining operational flexibility. Compared to traditional tolling structures, they offer a simpler and faster route to agreement while still supporting bankability, without locking assets into rigid operating frameworks. Combined with renewable assets, they form part of a broader shift towards hybrid solutions that integrate generation, flexibility, and structured risk management.
Connecting markets, flexibility and structured solutions
This is also where Centrica Energy plays a distinct role. With deep expertise in energy markets, trading and storage optimisation, we structure solutions that bring these elements together in practice, combining CPPAs and financial overlays such as TBx or Day Ahead swaps into a coherent route-to-market. This allows developers to access bankable, flexible revenue structures, and enables large energy consumers to capture the value of flexibility without taking on the complexity of owning and operating assets themselves.
In that sense, the shift in Spain is not just about batteries or contracts in isolation, it is about how these pieces are combined. Our role is to connect them, turning volatility, price spreads and flexibility into structured, investable solutions that reflect how the market now works.
The implication for market design and contracting is clear. Spain is moving away from a market defined by volume, towards one defined by timing, flexibility and shape. Solar generation remains fundamental, but it is no longer sufficient on its own. Competitiveness now depends on the ability to optimise delivery, structure risk and align supply with real demand.
For both developers and corporates, success increasingly lies in combining generation, storage and tailored financial solutions into integrated, market-aligned contracts, not treating them as separate components.
