Rising energy costs have returned as a dominant force shaping inflation across the UK and Ireland. UK inflation climbed to 2.9% in the year to July 2026, its highest in four months, driven by a 13% increase in Ofgem’s price cap adding £221 (approximately €258) to the typical annual bill. Gas prices rose at their sharpest pace in almost four years after the US-Israel war with Iran triggered effective closures of the Strait of Hormuz, disrupting global oil and gas supplies.

For business energy leaders, this data is a compelling mandate. Fossil fuel price volatility, driven by geopolitical events beyond any organisation’s control, is the primary driver of energy cost inflation. Three July dimensions deserve attention: the 13% price cap increase; KPMG chief economist Yael Selfin’s forecast of inflation peaking at around 3.5%; and Cornwall Insight’s projection of a further 4% rise in energy bills from October, taking them to their highest since July 2023.

The geopolitical driver is structural. Cornwall Insight noted that energy costs are compounded by a European heatwave increasing gas demand for cooling. Suren Thiru, chief economist at the ICAEW, has described rising inflation as likely the biggest near-term threat to UK economic growth, eroding household budgets and business competitiveness.

For Ireland, where 78.2% of total energy came from imports in 2025 and 93% were fossil fuels, the lesson is direct. Every oil or gas price shock through the Strait of Hormuz passes into Irish energy bills. Investment in clean energy, on-site solar, wind power purchase agreements, or energy efficiency, is the most effective hedge against the geopolitical shocks the SEAI confirms remain Ireland’s primary structural vulnerability.

Irish renewable energy performance provides a clear commercial contrast. On high-wind days in early 2026, wholesale electricity prices averaged €94 per megawatt hour. On low-wind days, they doubled to €179. Wind Energy Ireland confirms that fossil fuels push wholesale prices up by approximately 19% on low-renewable days. Businesses with on-site solar, power purchase agreements, or reduced gas dependency are materially better positioned than those still fully exposed.

Three priorities stand out for C-suite leaders in business energy. First, use the UK inflation data to build the boardroom case for renewable procurement and on-site generation, framing investment as geopolitical price risk mitigation. Second, review energy procurement contracts for gas-indexed pricing exposure. Third, position clean energy solutions as an inflation hedge, addressing commercial concerns the July data makes impossible to ignore.

Energy cost inflation driven by fossil fuel disruption is the defining risk in business energy in 2026. Ireland’s renewable capacity is growing and policy support is strong. Business energy leaders who accelerate the shift to domestically generated renewable energy will build the resilience that geopolitical shocks have made commercially essential.