US energy inflation accelerated for the second month to 20.4% in September 2026, marking the highest level since May. Price growth quickened for energy commodities such as fuel oil (74.2% vs 52%) and gasoline (34.2% vs 27.4%), as well as for gas services (5% vs 4%) and electricity (4.4% vs 3.8%). Compared to the previous month, energy prices climbed by 5.2%, the most since March, after a 2.1% rise in the previous month.