CPI Energy.
The CPI energy index covers what households spend on motor fuel, household energy, and related services. It's roughly 7% of headline CPI but the most volatile component by far — and the dominant reason headline and core inflation diverge.
Energy inflation, year-over-year
FRED:FPCPITOTLZGUSA · U.S. CPI YoY (use widget to switch to category series)
MonthlyWhat CPI energy measures
Energy CPI breaks into two halves: energy commodities (mostly gasoline, plus fuel oil and other motor fuels), and energy services (electricity and piped natural gas to the home). Gasoline alone is about 3% of the total CPI basket — small in nominal terms but oversized in impact because it changes weekly and is visible to every driver.
The combined energy index has year-over-year swings of ±20% on a regular basis and ±40% in shock periods. It can flip from significant headwind to significant tailwind for headline CPI in a quarter, which is precisely why Fed policy targets core rather than headline.
Sub-component breakdown
| Sub-component | Approx. weight | Notes |
|---|---|---|
| Motor fuel | ~3.5% | Gasoline (90%+ of motor fuel), plus other motor fuels |
| Electricity | ~2.5% | Residential electric service |
| Utility (piped) gas service | ~0.8% | Natural gas delivered to homes |
| Fuel oil and other fuels | ~0.2% | Heating oil, propane, kerosene |
| Energy commodities (combined) | ~3.7% | Gasoline + fuel oil + other |
| Energy services (combined) | ~3.3% | Electricity + piped natural gas |
Weights are shares of CPI-U, rounded. Exact values vary annually. Source: BLS Relative Importance tables.
What moves energy inflation
Crude oil is the upstream driver of gasoline and fuel oil. Pump prices typically track WTI or Brent with a 2–6 week lag, modified by refining margins (the crack spread), seasonal demand, and regional supply disruptions. Hurricane shutdowns in the U.S. Gulf and refinery fires can spike gasoline independently of crude.
Natural gas drives household gas utility bills and a large share of electricity in the U.S. (about 40% of generation). Henry Hub futures feed regulated retail prices with a longer lag — typically a quarter or more depending on utility commission approvals.
Generation mix and regulation matter for electricity. States with more renewable mandates or aging fossil plants needing replacement have seen faster electricity inflation than the national average. Capacity-market reforms, transmission constraints, and grid-modernization costs all flow through over multi-year horizons.
Geopolitics regularly shows up. The OPEC+ supply cuts of 2023, Russia's invasion of Ukraine in 2022, the Iranian sanctions episodes, and the Gulf wars of the 1990s all produced step-changes in energy CPI within months.
How energy inflation has behaved
Energy inflation has driven nearly every major CPI shock of the past 60 years. The 1973–74 Arab oil embargo quadrupled crude prices and pushed energy CPI above 30% year-over-year. The 1979–80 Iranian Revolution did it again. The 2007–08 oil spike to $147/barrel and the post-COVID 2021–22 rally each produced 40%+ energy CPI peaks.
Energy CPI is also notable for its dramatic reversals. After the 2008 peak, energy CPI was running below -25% year-over-year by mid-2009 — a -65 percentage-point swing in 12 months. The 2022 peak was followed by negative energy CPI prints throughout 2023. These reversals can pull headline CPI down fast even when core remains sticky, which is what produced the famously misleading 'headline-only' disinflation narrative of 2023.
Frequently asked questions
Why is energy excluded from core CPI?
Energy prices swing so much month to month that including them would make underlying inflation impossible to read. Crude oil alone can move 5–10% in a week.
How fast do oil prices show up at the pump?
Roughly 2–6 weeks for the bulk of the move. Refining margins, regional inventories, and gasoline-specific demand can produce divergence in either direction.
What's the largest energy sub-component?
Motor fuel — almost entirely gasoline — is the largest, at about 3.5% of the total CPI basket. Electricity is second at around 2.5%.
Are home heating costs in energy CPI?
Yes. Piped natural gas service and fuel oil are both inside energy services. Heating-driven CPI swings are visible in the not-seasonally-adjusted data each winter.
How does energy CPI compare to PPI energy?
PPI energy measures producer-level prices, including the cost of crude oil to refiners. It typically leads CPI energy by several weeks and is more sensitive to wholesale supply shocks.
Why didn't the 2022 oil spike hit gasoline as much as the 2008 one?
Multiple reasons: oil prices peaked at $130, not $147; refining capacity reductions widened the crack spread differently; and the U.S. is now a net oil exporter, which dampens the pass-through compared to 2008.