Politicians in England and Scotland are under heavy pressure to secure commitments from turbine suppliers — pressure that has only intensified after players such as Vestas and Doosan backed away from initial pledges to build factories on British soil. Siemens recently delayed its final decision on a factory in Hull, northeast England, until next year.

The situation is complicated by the rivalry between Scotland and England, which are competing against each other for supply-chain commitments, even as the UK competes with the likes of Germany and France.

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