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A transmission network doesn't sell power — it owns the high-voltage wires and earns a regulated return on its asset base, decoupled from how much electricity flows. Pick a real network below and follow it through the grid, the regulatory model and a working returns model.
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Drag the sliders to see what earns the regulated revenue — the asset base and the allowed return, not the power flow.
A transmission network is a natural monopoly, so it doesn't charge a market price — a regulator sets its allowed revenue. The building blocks are the same the world over: a return on the asset base (the RAB or rate base) at an allowed cost of capital; recovery of depreciation (return of capital); an opex allowance; and incentives for out- or under-performance. Crucially the revenue is decoupled from how much power flows — and the RAB is inflation-protected and grows with every pound of capex, compounding the base.
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See also the standalone live transmission (RAB) simulation — a generic regulated grid with the same return-on-RAB revenue → EBITDA → returns build.