Wintershall Dea | 102,327 followers on LinkedIn. Wintershall Dea is an energy company with a long history, the last chapter of which is now being written. | Wintershall Dea is an energy company with a long history, whose final chapter is being written. Effective September 3, 2024, the majority of the company's former E&P and CCS assets and licenses were sold and transferred to Harbour Energy. Wintershall's responsibilities include, among other things, the disposal of remaining assets and ultimately the cessation of business operations.