The solar start-ups Enpal and 1Komma5° have rapidly achieved billion-dollar valuations. But internal documents show: Enpal founder Mario Kohl is dealing with problems.

Are they now crashing again? With the right manager subscription, you can find out. You can read the manager magazine and the Harvard Business Manager as an e-paper in the app. All items in the manager app for just €24.99 per month. Can be canceled at any time.