The European Commission’s Staff Working Document SWD(2025) 435 is described as the first comprehensive fitness check of the EU’s modern energy-security architecture. It assesses how the Gas Security of Supply Regulation and the Electricity Risk-Preparedness Regulation operated during the 2021–2023 energy crisis. The document is formally focused on EU Member States, but its findings are presented as directly relevant to Southeastern Europe.
Southeastern Europe is described as physically, commercially, and operationally embedded in the EU energy system. At the same time, it is characterized as institutionally fragmented between EU members, accession candidates, and Energy Community contracting parties. The document frames its assessment as a forward-looking view of how cross-border gas flows, electricity security, emergency coordination, infrastructure resilience, and sector coupling may tighten over the coming decade.
Core objectives and changing operating conditions for EU energy security
The Commission’s assessment states that the core objectives of the EU energy-security framework remain valid. These include ensuring continuity of supply, preventing unilateral crisis responses, and embedding solidarity across borders. The document links these objectives to an operating environment it describes as structurally different from the period of the 2021–2023 crisis.
It describes gas demand as structurally declining while remaining critical for power balancing and industry. Electricity systems are characterized as becoming more weather-dependent, more digital, and more exposed to cascading failures. Infrastructure is described as both a physical asset and a strategic asset with cyber vulnerability.
The document also indicates that experience from Southeastern Europe during crisis years is reflected throughout the assessment even when the region is not named explicitly. It presents Southeastern Europe as an internal stability buffer whose weaknesses can translate into systemic risk for the wider European market. It also frames alignment with EU-style rules as increasingly tied to practical operations rather than membership status.
Regional risk planning under gas security rules
A key finding highlighted for Southeastern Europe concerns regional risk planning. The Commission concludes that mandatory regional risk groups and joint risk assessments under the gas security framework improved preparedness during the crisis period. It also says this reduced incentives for purely national crisis measures.
The document connects this approach to cross-border system design in Southeastern Europe. It states that Serbia’s gas security cannot be separated from Hungary, Bulgaria, and Bosnia and Herzegovina. It similarly links North Macedonia’s electricity stability to Greece and Bulgaria.
For Montenegro, the document says system stability depends on regional hydrology and interconnections with Serbia, Bosnia and Herzegovina, and Italy. It presents these linkages as consistent with a regional logic long argued by planners in Southeastern Europe. It also says such logic had often lacked political backing to implement consistently.
Crisis coordination constraints on export bans and transparency
During the energy crisis years, the EU framework is described as constraining unilateral export bans. The document also says it required transparency on storage levels and on demand-reduction measures. It further characterizes this period as creating predictable coordination channels across borders.
For Southeastern Europe, the document frames this record as relevant to access to cross-border flows under stress conditions. It states that future revisions of EU security legislation will deepen regional obligations rather than dilute them. It adds that neighbouring systems are expected to operate using compatible assumptions, data standards, and crisis scenarios.
Gas infrastructure flexibility: reverse flows, interconnectors, shared storage
The Commission identifies gas infrastructure flexibility as a decisive factor in avoiding physical shortages during the crisis. It points to reverse-flow capabilities, interconnectors, and shared use of storage as elements highlighted in its assessment. The document links these findings to vulnerabilities attributed to legacy network configurations in parts of Southeastern Europe.
It describes much of the region entering the crisis with legacy single-direction pipelines and reliance on a limited number of entry points. While emergency measures and ad-hoc arrangements are described as mitigating worst outcomes, SWD(2025) 435 states future security policy will be less tolerant of structural rigidity. This is presented as a shift in how resilience expectations may be applied.
The document also connects these requirements to operational harmonisation with EU transmission system operators for gas-related planning. It references bidirectional interconnectors and regional storage access agreements as part of that logic for governments and utilities in Southeastern Europe. It further notes that gas infrastructure investment may be framed within risk management where gas remains a marginal stabiliser for power systems with high renewable penetration.
Hydrogen readiness and low-carbon gases in future gas planning
The document hints that future EU rules may integrate gas security planning with hydrogen readiness and low-carbon gases. It states this development could have implications for Southeastern Europe’s pipeline networks and storage assets. This is positioned within broader expectations for adaptation of energy-security instruments over time.
In parallel with gas-focused changes, SWD(2025) 435 identifies electricity security as a weaker leg of the current framework compared with gas security. The Commission says electricity risk-preparedness lagged gas security in maturity, enforcement, and integration with long-term adequacy planning. The finding is presented as particularly significant for Southeastern Europe given rapid electricity-system change.
Electricity risk preparedness tied to adequacy planning
The document describes hydropower-dependent countries in Southeastern Europe as facing increasing climate variability. It also characterizes thermal fleets as ageing and exposed to carbon costs. Renewable capacity expansion is described as occurring faster than grid reinforcement in several jurisdictions.
It states electricity security can no longer be treated only as a short-term emergency issue. Instead, it says electricity security must be embedded in long-term system adequacy, cross-border capacity planning, and operational coordination. For Southeastern Europe, it indicates participation in ENTSO-E planning processes may become increasingly binding in practice even for non-EU members.
The Commission also highlights regional adequacy assessments and coordinated outage planning within this framework. It emphasizes spillover effects between gas and electricity systems in regions where gas-fired generation supports balancing for renewables and hydropower volatility. This linkage is presented as relevant to how risks may propagate across sectors during stress conditions.
Cross-sector integration: droughts, heatwaves, hydro output and gas burn
The Commission describes a need for better cross-sector integration between gas and electricity security frameworks. It acknowledges existing frameworks still treat them largely in silos despite interdependencies identified during crisis conditions. For Southeastern Europe, it ties this observation to operational experience during disruptions.
The document states that gas supply disruptions translate rapidly into power-sector stress. It also links drought conditions to reduced hydro output alongside increased gas burn for balancing needs. Heatwaves are described as simultaneously raising electricity demand while constraining thermal generation.
SWD(2025) 435 calls for integrated risk scenarios intended to capture feedback loops between these factors. It indicates future EU guidance may require more sophisticated modelling that reflects these interactions across sectors rather than treating them separately.
Reporting burdens, data sharing, cybersecurity and critical infrastructure resilience
The fitness check addresses administrative capacity and reporting burdens relevant for regulators and ministries in Southeastern Europe. The Commission recognizes that reporting and simulation requirements improved preparedness but created complexity and duplication. It suggests streamlined and standardised processes could improve compliance effectiveness where institutional capacity is thinner than in core EU Member States.
The document also states simplification would not reduce expectations on data quality or transparency requirements. Instead it presents better data sharing and digitalisation as prerequisites for more efficient oversight across jurisdictions involved in energy-security governance.
Beyond core gas and electricity regulations, SWD(2025) 435 situates energy security within broader resilience measures including critical infrastructure protection and cybersecurity. It highlights resilience of essential entities as increasingly central to supply security under evolving threat environments described for transmission grids, substations, compressor stations, and digital control systems across Southeastern Europe.
Adaptation pressures from decarbonisation electrification sector coupling
The Commission’s forward-looking conclusions state that while objectives remain valid adaptation is unavoidable. It links this need to decarbonisation, electrification, sector coupling, and geopolitical fragmentation requiring new instruments and revised obligations within deeper coordination arrangements across borders.
The document indicates that Brussels-developed energy-security rules will increasingly define operational conditions of the regional market regardless of formal membership status for countries on the EU periphery. It frames Southeastern Europe as both a beneficiary of deeper integration measures such as resilient infrastructure and clearer crisis-management rules while also being exposed due to structural vulnerabilities described in investment gaps and institutional asymmetries.
SWD(2025) 435 positions regional interconnected systems outside full alignment expectations as potential weak links affecting overall EU-level energy-security outcomes during shocks. It presents shared rules, shared data requirements, and shared responsibilities as governing conditions rather than purely national issues across Southeastern Europe’s interconnected footprint.