Dong Energy A/S plans to invest about $1.8 billion a year on offshore wind projects to offset a “challenging” environment for gas plants, as it ceases to build new coal power facilities, its chief said. That’s about what the world’s largest developer of offshore wind parks spent last year on turbines installed at sea. “We think that is around that level we will be working at in the coming years,” said Anders Eldrup, chief executive officer of the Fredericia, Denmark-based company. Dong announced that Eldrup, who spoke in an interview on March 9, is stepping down as chief executive. Finance director Carsten Krogsgaard Thomsen will be acting CEO until a new chief executive is found, it said, adding that there will be no change in the company’s strategy.