CGN commissions a 2-GW offshore wind farm in China using 18-MW turbines

CGN has commissioned a 2-GW offshore wind farm in China built around 18-MW turbines, as Renewables Now reported. The two figures in the item — 2,000 MW of nameplate capacity and an 18-MW rating on each machine — describe an asset that has finished being built and started being operated. Commissioning is the hinge: construction crews and warranty schedules give way to service crews and production targets, and the capital sunk into steel and cable stops being a project and becomes a plant. For a developer, a milestone of this kind converts a spending programme into a revenue one.

The arithmetic is worth doing. Two thousand megawatts divided by 18 comes to a little over 111, the machine count if the array were built uniformly at that rating — an assumption the headline does not settle, and one that decides a great deal. Offshore cost sits disproportionately in the items built once per position rather than once per megawatt: foundations, inter-array and export cable, the offshore substation, and the vessel days consumed lifting each unit into place. Fewer, larger machines divide that fixed bill across more capacity; more, smaller ones stretch the installation campaign, and campaign length is itself a line in the budget. A 2-GW site is where that trade-off gets settled at scale, which is why the rating, not only the total, is the number turbine suppliers and the installation-vessel market read.

Returns on an asset this size turn on how the output is sold — under a tariff fixed before construction, or at prices set by whatever the market pays — and on the cost of whatever debt was raised against it. Tariff, counterparty, and tenor are what a lender, a refinancing bank, or an eventual buyer underwrites. A power-purchase agreement, a grid-connection detail, or a refinancing of construction debt would each carry that information, and any of them would move the project from an engineering record to a commercial one.

The operating phase answers a different question than the construction phase did. What gets invoiced is whatever the wind provides and the grid accepts, which rarely matches the nameplate figure, so the value of the array is set as much by its connection and its curtailment regime as by its rating. The next number to look for on this project is a generation figure; the capacity one has now been claimed.