Japan's offshore wind ambitions are colliding with the hard arithmetic of a changed world. BP's withdrawal from the Yamagata Prefecture consortium — following Mitsubishi's earlier exit from three separate projects — reveals that the bids developers made in calmer economic times no longer reflect the costs they now face. The government has responded with expanded revenue guarantees and financial incentives, but the gap between what these projects cost and what they can earn has grown wide enough that even major international players are choosing retreat over ruin. What unfolds next will test wh