Flexibility in power systems is described as a portfolio of capabilities operating across different timescales, fuels, and infrastructures. The set includes batteries, hydro reservoirs, gas storage, linepack, demand response, and industrial load adjustments. How these elements interact is presented as a key factor for managing an integrated energy system.
Short-term balancing from batteries
Batteries are characterized as responding within seconds to smooth short-term fluctuations in electricity supply and demand. Their main attributes are speed and precision, which are described as suitable for frequency control and intraday balancing. They are also cited as a way to manage renewable variability over hours rather than days.
The source also notes limits on sustained operation. Batteries are described as energy-limited, meaning they cannot sustain output over extended periods. The same limitation is linked to an inability to address seasonal imbalances.
Longer-timescale security from gas storage
Gas storage is positioned at the longer end of the flexibility spectrum. It is described as absorbing seasonal demand swings and providing security during prolonged stress. Storage facilities are also linked to buffering gas-market shocks from weather, supply disruptions, or LNG diversion.
Through gas-fired generation, the flexibility from gas storage is described as being translated into electricity market stability. When gas storage is ample and accessible, power markets are described as able to absorb renewable variability and demand spikes more smoothly.
Intermediate tools: pumped hydro, linepack and demand response
Pumped hydro is presented as an intermediate option for multi-hour to multi-day balancing. Its availability is described as geographically constrained. Linepack is described as providing short-term gas flexibility by allowing pipelines to act as storage.
The source states that linepack capacity is limited and sensitive to pressure management. Demand response is described as enabling consumption to adjust to system conditions, but it requires regulatory frameworks and consumer participation that are still developing.
Regional constraints in South-East Europe
The flexibility portfolio in South-East Europe is described as uneven. The region benefits from significant hydro capacity in certain areas, which is cited as providing valuable medium-term balancing. At the same time, battery deployment is described as remaining limited.
Gas storage capacity is described as concentrated in a few locations, while demand response is characterized as underutilised. The source also says market incentives for flexibility are often weak or inconsistent. It links this imbalance to increased reliance on a narrow set of tools, particularly gas-fired generation, raising exposure to gas-market volatility.
How different flexibilities interact across timescales
The interactions between flexibility types are described as capable of either stabilising or destabilising the system. Effective coordination is said to allow short-term tools such as batteries to manage immediate fluctuations while longer-term resources such as gas storage address sustained imbalances.
When coordination is lacking, the source describes assets working at cross purposes. It gives an example where aggressive battery discharge during peak prices can reduce incentives for longer-term storage investment, undermining seasonal resilience.
Role of market design and cross-border alignment
Financial and regulatory frameworks are described as shaping these interactions. Markets that reward speed but not endurance are said to encourage overinvestment in short-term solutions at the expense of long-term security. Mechanisms focused solely on capacity are described as potentially undervaluing fast response, increasing short-term volatility.
The source adds that aligning incentives in South-East Europe is particularly challenging due to cross-border dependencies. Flexibility assets in one country are described as serving neighbouring markets, while investment signals remain national. It says this misalignment can lead to underprovision of regional public goods such as storage or interconnection capacity, exacerbating volatility during stress events.
Shifts expected with higher renewable penetration
The evolution of flexibility portfolios is linked to changes in the region’s energy trajectory. As renewable penetration increases, the relative value of different forms of flexibility is described as shifting. Batteries are cited as potentially becoming more prominent for intraday balancing.
Gas storage is described as remaining critical for seasonal security. Demand response is described as having potential for a larger role if regulatory barriers are addressed.
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