A processing plant takes in raw gas from many producers, separates it into salable products, and then has to tell each producer what became of the gas they delivered. The document that does this is the gas plant allocation statement, issued monthly, and it is where a producer's field measurement meets the plant's accounting. This guide walks through what the statement contains - inlet volume in, products out, deductions taken - explains the mass balance that ties it together, and shows why the accuracy of inlet metering drives every number a producer sees.
Gas Plant Allocation Statement in one line: A gas plant allocation statement is the monthly document a processing plant issues to each connected producer, showing the gas the producer delivered to the plant inlet, the salable products attributed back to them, and the volumes deducted along the way. It reports inlet volume in; residue gas and natural gas liquids out; deductions for plant fuel, flare, and processing shrink; and the producer's allocated share of each product. It is essentially the settlement that tells a producer what their delivered gas became and what they are owed.
The statement follows the gas from the moment it enters the plant to the products that leave it. It begins with inlet volume: the quantity of raw gas the producer delivered to the plant inlet over the month, measured where their stream is received. From that raw gas the plant makes salable products, and the statement attributes each producer's share of them. The two principal products are residue gas - the processed, pipeline-quality gas that remains after the heavier components are stripped out - and natural gas liquids, the NGL products such as the heavier hydrocarbons the plant recovers and sells separately. A producer sees how much of each product is credited to the gas they brought in.
Between the raw gas in and the products out sit the deductions, and the statement makes these explicit because they are volume the producer delivered but does not get credited as product. Plant fuel is gas the facility burns to run its own compressors and processes. Flare accounts for gas combusted for safety or operational reasons. Processing shrink is the overall reduction in volume as the raw stream is turned into separate products - the sum of what was consumed, lost, or moved into the liquid products rather than remaining as residue gas. The statement lays out each producer's allocated portion of these deductions alongside their allocated products, so the full accounting of their delivered gas is visible in one place.
Underneath the statement is a conservation principle: everything that goes into the plant has to be accounted for coming out. The total gas received at all producer inlets must equal the total residue gas, plus the NGL products recovered, plus the fuel burned, plus flare, plus any measured losses. This is the plant's mass balance, and it is what makes the statement internally consistent rather than a collection of unrelated figures. The plant first establishes these totals for the whole facility, then allocates each producer a share of every category in proportion to what they contributed, so that the sum of all producers' shares reconciles back to the plant totals.
Because it is an allocation, the same theoretical-versus-measured tension present anywhere hydrocarbons are commingled applies here. The plant measures its aggregate inputs and outputs accurately, but attributing products and deductions back to individual producers relies on the composition and volume of each producer's inlet stream, which is where the estimation lives. A producer's share of NGL, for instance, depends on how rich their gas was, so the allocation leans on inlet analysis as much as on inlet volume. The mass balance guarantees the parts add up to the whole; the fairness of each producer's individual share depends on how well their contribution was characterized at the inlet.
Every figure on a producer's statement traces back to the measurement of gas at the plant inlet, which is why inlet metering accuracy is the foundation of the whole settlement. The inlet volume sets the size of the producer's contribution, and inlet composition analysis shapes how much residue gas and how much NGL are attributed to them. An error at the inlet does not stay contained; it propagates through the allocation into the producer's product credits and their share of fuel, flare, and shrink. A producer who cannot trust the inlet measurement cannot fully trust any number that follows from it, which is why measurement at the point of receipt is scrutinized so closely by both plant and producers.
This is precisely why producers benefit from having their own independent view of what they delivered. The statement is the plant's account of the producer's gas; the producer's own field measurement is the check against it. Reconciling the two - comparing the volume and quality a producer measured at their own facilities against the inlet volume and allocated products the plant reports - is how a producer catches discrepancies rather than accepting the statement on faith. A cloud SCADA platform such as Merobix supports this by giving producers a centralized dashboard of their own field measurement across all their delivery points, so when the monthly statement arrives they can compare the plant's numbers against their independently recorded volumes and flag any gap. The plant issues the settlement; independent field data is what lets a producer verify it.
It reports the producer's inlet volume delivered to the plant, the salable products attributed back to them - residue gas and natural gas liquids - and the deductions taken along the way, including plant fuel, flare, and processing shrink. Each producer sees their allocated share of every product and every deduction. In effect it is the monthly settlement showing what a producer's delivered gas became and what they are credited with.
Shrink is the overall reduction in volume as raw inlet gas is processed into separate products - the portion of the delivered gas that does not remain as residue gas. It includes gas consumed as plant fuel, gas flared, measured losses, and volume that moves into the recovered natural gas liquids rather than staying in the residue stream. The statement allocates each producer their share of shrink so their delivered volume is fully accounted for between inlet and products.
Because every number on the statement depends on the plant's inlet measurement and allocation, an error at the inlet propagates into a producer's product credits and deductions. Comparing the statement against the producer's own independently recorded field volumes and gas quality is how discrepancies are caught rather than accepted on faith. A centralized view of a producer's own field measurement across all delivery points makes that monthly reconciliation practical.
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