Understanding the UK forward curve for gas and power: A buyer's guide

Navigating the UK forward curve: A strategic view for energy buyers

Energy procurement is not just about securing supply—it's about managing financial risk. For finance directors overseeing energy budgets, the forward curve is a critical tool. It shows the market’s expectation of future gas and power prices, typically out to five years. These curves are not predictions, but aggregated market views shaped by supply constraints, demand forecasts, weather expectations, and policy signals. A clear understanding of how the curve moves allows buyers to time procurement, lock in favourable prices, and avoid costly surprises. The key is not to trade the curve, but to use its shape and shifts to make informed, defensible decisions.

What the forward curve actually shows

The forward curve plots the price of electricity and gas at future delivery dates. For power, the curve is typically built from the UK’s day-ahead and intraday markets, plus longer-term contracts and exchange-traded derivatives. Gas curves are similarly derived from the National Balancing Point (NBP) and forward contracts. The shape of the curve—whether upward sloping (contango), downward (backwardation), or wavy—reflects market expectations. A steep upward curve suggests rising costs, often due to anticipated supply shortages or higher fuel prices. A downward curve may signal excess supply or weak demand. In the UK, seasonal patterns are pronounced: winter months typically show higher prices due to heating demand, while summer months often see lower, flatter curves.

What drives the curve’s shape and movement

Several factors influence the curve. Weather is a major driver—cold snaps increase gas demand, pushing prices up and steepening the winter curve. Conversely, mild winters can flatten it. Generation mix matters too: a shift from gas to renewables reduces gas demand and pressures prices. The UK’s energy transition, guided by DESNZ and NESO, means more renewables and less gas-fired generation, which can reduce volatility over time but increase short-term swings during low-wind or low-solar periods.

Regulatory mechanisms also play a role. The capacity market ensures sufficient generation is available, influencing long-term power prices. The carbon price support (CPS) and CCL (Climate Change Levy) add cost to fossil fuel use, pushing up gas prices relative to renewables. Ofgem’s MHHS (Market Hours and Holidays System) affects trading hours and liquidity, particularly in the day-ahead market, which feeds into curve construction. For gas, TNUoS (Transmission Network Use of System) and DUoS (Distribution Network Use of System) charges are baked into forward prices, especially for winter peaks.

Contango and backwardation: what they mean for buyers

Contango occurs when forward prices exceed spot prices—typically seen in winter months when supply is tight. This shape can encourage buyers to defer procurement, assuming prices will rise further. But for long-term budgeting, it signals that future costs are expected to be higher. Backwardation, where forward prices are below spot, is rarer but can happen in periods of surplus, such as when high wind output drives down power prices. In such cases, the curve may slope downward, suggesting prices will fall.

For buyers, the key insight is that backwardation is not a signal to delay. In energy, forward prices are not just about expectations—they reflect risk premiums. A backwardated curve often means market participants are pricing in significant downside risk. Buying into it may lock in lower prices, but it also means the market expects a correction. The risk of buying too early is that prices may drop further, leaving you overcommitted. The risk of waiting is that prices rise unexpectedly. The balance lies in understanding your own budget constraints and risk tolerance.

When locking ahead works—and when it doesn’t

Locking in prices ahead of delivery can be a powerful tool for financial stability. TUS has managed over 150 GWh under flexible procurement, consistently beating supplier projections by 20% in the past 12 months. This success comes from timing—buying when the curve is steep (indicating expected price rise) and avoiding it when the curve is flat or backwardated. But timing is not guesswork. It’s based on monitoring curve shifts, understanding seasonal patterns, and aligning with business cycles.

For example, if the winter 2025 curve shows a sharp upward slope from Q3 2024, it may be wise to secure a portion of winter demand now. Conversely, if the curve is flat or declining, waiting may be better. However, delays can backfire. In 2023, a sudden cold snap in November led to a 40% spike in NBP gas prices—buyers who waited until the last minute faced significant cost increases. The lesson: use the curve as a guide, not a rulebook.

Practical steps for finance leaders

1. Monitor the curve regularly. Use free tools like the TUS Yolk portal, which provides real-time curve data and historical trends. 27% of users have achieved average savings by switching contracts through the platform.

2. Understand the curve’s shape in context. A steep curve in winter doesn’t mean you must buy now. Consider whether the steepness is driven by supply risk, weather forecasts, or policy changes. Use TUS’s 30+ supplier panel to benchmark pricing.

3. Align procurement with business cycles. If your business has seasonal demand peaks, lock in prices ahead of those periods. For example, manufacturing plants with high winter energy use should consider winter procurement in Q3.

4. Use flexible contracts. TUS manages over 150 GWh under flexible procurement, allowing buyers to adjust volumes and timing. This reduces exposure to curve shifts.

5. Don’t ignore the long end. The 3–5 year curve can signal long-term cost trends. If it’s rising steadily, it may indicate a structural shift—such as higher carbon costs or reduced gas availability—requiring strategic planning.

Bottom line

The UK forward curve is not a crystal ball, but a strategic tool. For finance leaders, understanding its shape, drivers, and timing can prevent cost overruns and support budget certainty. Use it to anticipate risk, not react to it. When the curve is steep, consider locking in prices. When it’s flat or backwardated, assess the underlying risk. The goal isn’t to time the market—it’s to reduce exposure and improve financial resilience. With the right data and process, the forward curve becomes a reliable ally in procurement.