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Density of population in the areas where the electricity is needed can be an answer. They can build gigawatts of cheap onshore wind in Inner Mongolia but despite the biggest "supergrid" in the world, it will be extremely costly to bring it to Shenzhen or Canton. Much more than close offshore wind with low-ish performance.

Another remark is that teething issues are not uncommon even for our North Sea wind farms, so drawing conclusions on the offshore wind rationale of the most populous country in the world after 3 months in operation may be a bit premature.

Finally, when I worked there 15 years ago, they were launching one new commercial scale coal-fired plant every 3 days in the country because of the growth in energy demand, so their answer (when discussing maxi-hydro at the time) was that it was not one source of energy or another, but rather that anything else than coal that can be built should be built.

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