Preparing for the UK Winter: Key Energy Risks and Why Proactive Action Matters
With winter approaching, now is the time for businesses and organisations across the UK to act. While recent outlook suggests healthy margins for 2025/26, we still face real seasonal risks, cold snaps, volatile gas markets and local supply constraints that can raise costs and disrupt operations. Here’s a clear, practical briefing on what’s happening, the risks to watch, and the measures you should put in place today to protect your organisation.
The situation in brief — what the numbers are saying
- The National Energy System Operator’s 2025/26 Winter Outlook forecasts comfortable electricity margins this winter — around 6.1GW of margin, the largest since 2019/20, which is reassuring for system-wide electricity security.
- Gas storage and inventories remain the single biggest vulnerability in cold, high-demand periods. Recent market updates show UK gas storage is sitting below some European averages (UK ~63% full in early November commentary), and inventories can tighten quickly during sustained cold snaps.
- Weather remains unpredictable: the Met Office highlights record warm spells interspersed with sudden swings, and longer-range guidance points to possible cold periods later in the winter, this is the kind of volatility that drives spikes in demand.
- Energy prices remain sensitive to seasonal demand and global markets. The regulated household price cap was set at £1,755 (1 Oct–31 Dec 2025), illustrating the broader price context businesses operate within.
- Earlier in 2025 some industry voices warned that storage levels had been worryingly low during extreme weather; those events underline how quickly a short, sharp cold period can stress supplies.
Key risks to plan for
- Short-term demand spikes from cold snaps — short, very cold periods (hours–days) cause big jumps in gas and power demand.
- Local and operational constraints — even with national margins, local network issues, plant outages or transmission limits can cause curtailment or high local prices.
- Wholesale price volatility — global gas markets and shipping/import dynamics can push daily and seasonal wholesale prices higher, affecting both spot-exposed and renewal contract pricing.
- Supply chain & operational disruption — staff travel, delivery issues or frozen equipment can compound energy risks.
- Regulatory and political shifts — government interventions, storage policy changes or emergency market actions can change the landscape quickly.
Immediate actions for businesses
These recommendations are practical steps you can implement this week or month to reduce risk and cost exposure.
Procurement & contracts
- Review contract exposure: identify which sites/contracts are on soon-to-renew tariffs. Prioritise negotiating or fixing prices for the largest exposures. Market windows can appear where locking now reduces winter risk.
- Talk to your supplier/broker: confirm continuity plans, ask about firmness of supply and whether flexible/hedged options are available. Ofgem’s business guidance is a good reference for what to ask suppliers.
Demand reduction & efficiency (often the fastest wins)
- Immediate no-/low-cost savings: optimise thermostat set points, shorten heating schedules, isolate unused areas, and confirm building management systems are operating correctly.
- Short-term operational changes: stagger shift start times to reduce simultaneous peak heating, postpone non-essential high-energy processes during cold snaps.
- Check heating & insulation: repair draughts, lag pipes, and ensure plant rooms are secure against freezing. These reduce both demand and the risk of freeze-related failures.
Resilience & contingency
- Create a winter energy plan: assign roles (who makes calls during a supply alert), list critical loads, map fuel/equipment redundancy and emergency contacts.
- Backup generation & fuel: validate diesel/backup generator readiness, fuel delivery windows and compliance (if you rely on onsite generation).
- Consider demand-side measures: contracts for short-notice demand reduction, or temporary load-shedding plans, can reduce peak exposure and may be supported by suppliers/aggregators.
Financial & insurance checks
- Stress-test budgets under scenarios of higher wholesale prices or forced outages.
- Check insurance for business interruption related to cold weather or energy supply loss.
Practical tips for estates, facilities & operations teams
- Drain or lag vulnerable pipework and confirm frost-protection thermostats are operational.
- Service boilers, check valves and ensure automatic reset systems are correctly set post-maintenance.
- Confirm supplier SLAs for repair response times over holiday periods.
- Coordinate staff travel and remote-working contingencies for severe weather.
For energy managers and procurement leads — a three-point quick plan
- Map your exposures: list sites, contract types (fixed/flexible), and the value at risk.
- Prioritise fixes: lock or hedge the top 20% of consumption that represents ~80% of cost exposure.
- Operational readiness: test your winter plan, check generator readiness, and communicate protocols to operational teams.
Why acting now matters
Even though system-level margin forecasts look healthy this winter, the interplay of gas storage, local network constraints and weather volatility means high-impact, short-duration events can still cause disruption and price spikes. Acting early — securing supply where appropriate, reducing avoidable demand, and confirming resilience plans, reduces the chance of being exposed to rapid price rises or operational interruption. The events earlier in 2025 (when storage levels were flagged as low during a cold snap) are a reminder that conditions can change quickly.
How Enexus can help (tailored support)
We can support organisations with:
- Forensic reviews of energy bills and contract exposure,
- Bespoke procurement strategies (fixed vs. flexible advice),
- Efficiency checklists and quick-win project scoping,
- Winter-resilience planning (backup generation, demand-response options),
- Guidance on accessing any grants or support schemes.
If you’d like a rapid review of your winter readiness (procurement, operational or financial), get in touch — we’ll prioritise the highest-risk sites and outline an immediate action plan.
Final checklist (do this within the next 7–21 days)
- Identify contract exposures and speak to suppliers/brokers.
- Implement easy demand-reduction measures (thermostats, schedules).
- Test backup generation and freeze-protection for critical plant.
- Produce a short, named winter energy contingency plan for decision-makers.
- Review budgets and stress scenarios for wholesale price rises.
Looking ahead
Monitor the Met Office forecasts and system operator updates as the season progresses — weather and storage dynamics will determine how tight things get. NESO’s Winter Outlook suggests a robust electricity picture this season, but gas storage and weather volatility remain the wildcard for price and supply risk.
