Energy is the most volatile component of consumer price indices — and the most powerful driver of headline inflation swings. The 2022 price shock (Brent crude above $120/bbl; EU natural gas above €300/MWh after Russia's invasion of Ukraine) added roughly 3–4 percentage points to headline inflation in Europe and 2+ percentage points in the US at its peak. By 2026, the reversal of those prices has removed roughly the same amount from headline CPI, playing a major role in the disinflation episode. The US EIA Short-Term Energy Outlook and the IEA Oil Market Report are the authoritative monthly sources for energy price forecasts.
How energy prices transmit to CPI
Energy enters CPI through two channels. Direct: petrol/diesel, home heating fuel, electricity and gas bills are explicit CPI components. In the US, energy has a weight of about 7% in CPI-U; in EU HICP, around 10%. Indirect: energy is an input cost for every sector — transport, manufacturing, agriculture. Higher energy costs eventually push up the price of nearly everything else, though the pass-through takes 3–12 months and is partial (firms absorb some in margins). The World Bank Commodity Markets Outlook estimates that a 10% rise in oil prices adds approximately 0.2–0.4 pp to CPI in advanced economies within 6 months.
Base effects: the coming reversal
The year-on-year comparison for energy CPI depends critically on what happened in the same month a year ago. In 2023–2024, energy prices were falling from high bases set in 2022 — creating large negative base effects that dragged headline CPI down. In 2025, energy prices were already low, so 2026 comparisons look roughly neutral. In H1 2027, the comparison will be against Q1 2026's relatively low energy prices — which could add 0.2–0.5 pp back to headline CPI mechanically, even with no change in underlying energy prices. Understanding this base-effect calendar is essential for interpreting headline inflation moves. See our components guide for a practical walkthrough, and track energy price trends via FRED Brent crude (DCOILBRENTEU).