Reconciled demand understanding

  • Last post 16 September 2016
daringodber posted this 14 September 2016

I was looking at the 'Grid Demand Trends' report and specifically the reconciled demand data. The notes state:

"Reconciled demand and generation data is our most complete source of data and refers to all purchases and sales on the wholesale market that are cleared through the clearing manager. This data becomes available around the middle of the following month. More specifically, reconciled demand and generation refers to loss-adjusted purchases and sales, and represents the purchase and sale quantities upon which money changes hands between participants and the clearing manager. The loss-adjustment means that the actual consumption data submitted to the reconciliation manager by retailers and other purchasers is grossed up to account for losses in the distribution networks.”

The way I read this is that this reconciled demand data includes distribution network losses but I am unsure if I am reading it correctly. Is somebody able to confirm this for me?

Thanks, Darin


Phil Bishop posted this 16 September 2016

The short answer is 'yes' - reconciliation makes adjustments for distribution losses.

The reconciliation data used in the 'Grid demand trends' and the 'Grid generation trends' reports on EMI is derived from the 'GR-010' reconciliation report - see the reconciliation manager functional specification on the Authority's website.

The GR-010 report contains the reconciled purchases and sales volumes that the reconciliation manager passes along to the clearing manager. The NSP volumes that are submitted by participants to the reconciliation manager are loss-adjusted from NSPs (network supply points) to the relevant point on the grid, where a wholesale price exists. In the NSP table just alluded to, the relevant point on the grid is denoted by the field called 'Embedded under POC code' or, if that field is blank, the field denoted 'POC code'.

Many adjustments to submitted volumes occur as part of the reconciliation process but by far and away the largest one is the adjustment for losses. Only the losses occuring in the distribution network are accounted for via this loss adjustment. Transmission losses, i.e. losses incurred on the grid, are accounted for in the SPD model and are not part of the reconciliation process.

Only the sales (injections) and purchase (offtake) volumes are loss-adjusted back to the relevant point on the grid. The self-consumption of generation occuring behind the meter is not considered by the reconciliation process and does not therefore get loss-adjusted and nor does it show up in reports such as GR-010. For example, the occupants of a dwelling with PV panels installed on the roof might consume some of the output from those panels and sell the remainder to their retailer. It is only the volume sold to the retailer that makes its way into the reconciliation process. Reconciliation is a process that only exists in order to determine the volumetric basis upon which the wholesale market is cleared.