TNUoSTransmission Network Use of System (power grid measurements)
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A small part of the TNUoS charge represents the marginal cost of expanding the grid, but the overwhelming part is the residual charge to collect the regulated transmission revenue set in the periodic price controls.
Distribution-connected generation was credited with the avoided TNUoS charge, and hence gained a relative advantage of about [pounds sterling]50/kWyr compared to transmission-connected generation, so that the [pounds sterling]20/kWyr auction price translated into a [pounds sterling]70/kWyr benefit for these small generators.
However, businesses that have TNUoS as a pass-through charge on their bill can actively manage their consumption, and therefore their costs, during these times as part of an business energy management strategy.