Orlando Wagner and Jochen Hauff compare the booming renewables market with other sectors where a boom has been followed by a bust, on the lookout for danger signals. They conclude that the renewable energy sector has strong foundations - but does have some areas of vulnerability, which they examine in detail. They conclude that industry should 'de-hype' the boom, and that a long-term, harmonized renewables support system is important to stabilize the investment framework and enable investors to fulfill the ambitious political targets in Europe - and elsewhere.