AEMO Glossary U
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Unaccounted for gas (UAFG)
The difference between metered injected gas supply and metered and allocated gas at delivery points. UAFG comprises gas losses, metering errors, timing, heating value error, allocation error, and other factors.
Unserved energy (USE)
The amount of energy that cannot be supplied because there is insufficient generation capacity, demand-side participation (DSP), or network capability to meet demand. Under the provisions of the Reliability Standard, each region’s annual USE can be no more than 0.002% of its annual energy consumption.
When gas that is higher than market price needs to be injected for operational reasons, market participants are paid to cover the difference between the market price and their bid price (ancillary payments). The uplift charges fund the ancillary payments. Congestion uplift charges are a sub-set of uplift charges.