Zambia's September fuel cost is set, and the regulator has published its workings.

A generator in Zambia burning diesel, and any mine or offtaker whose energy bill passes a fuel cost through, now has the month's pump prices fixed by the regulator rather than negotiated in the market it buys from. The Energy Regulation Board published its September determination on 31 August 2026, under the heading "September 2026 Petroleum Pump Prices, Press Statement and Price Build-ups".

The release is more than one number at the pump. It carries the press statement, the build-up behind the pump price, a wholesale build-up covering petrol, diesel and kerosene, and a further wholesale build-up for Jet A-1, the aviation fuel. On this reading, the build-ups are the useful part for a fuel buyer: they set out the landed cost of the product separately from the taxes, levies and margins stacked above it, so a buyer can see whether a movement came from the import bill or from a decision taken at home.

That distinction carries into power. Diesel sits in the cost stack of any site running generators for backup or for firming, and kerosene and Jet A-1 price into the logistics behind remote operations. The implication is that where a fuel supply agreement or a mining contract indexes to the regulated pump price, this determination is the index itself, not a reference point sitting beside it.

What the determination leaves to a buyer is narrower than the headline at the pump: whether to lift stock at this month's price or hold for the next statement, and whether the fuel cost assumption sitting inside a tariff, a dispatch plan or a security of supply case still matches the build-up now on the record. Read together, the month named in the document's title and its publication on the eve of that month give any such assumption a stated life rather than an open one.