Monthly settlement under the Transmission Tariff and the Market Rules is another important administration function whereby detailed charges and credits are calculated and settled with the various market participants. Among other tasks, the settlement function involves accounting for hourly energy flows at the hundreds of points of receipt and delivery on the NBSO controlled grid, thereby ensuring that the various market participants pay for energy taken and are credited for their energy contributions. The settlement function also ensures that market participants pay for their use of the transmission system in accordance with the regulated tariff.