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The DS3 System Service arrangements came into being, on an interim basis in 2016, and on a fully regulated basis in 2018. At the time, the decision was made not to place a cap on the volume for which payments would be made and to apply a Temporary Scarcity Scalar (TSS) of 4.7 at times where System Non-Synchronous Penetration (SNSP) > 60%, increasing to 6.3 at times of SNSP > 70%. This approach was deemed prudent in order to reach our 2020 renewable goals by incentivising renewable and battery technologies on to the grid. As is laid out in Section 5, this has been very successful, with impressive growth in batteries, renewables, and DSU’s and a power system that operates at 75% SNSP.