The mainstream development discourse has located the idea of blended finance as a central element.The key argument is that States do not have sufficient resources to meet the investments needed to promote and sustain development. For this reason, it is necessary to combine different sources of financing, including the private sector which appears as a predominant actor. It is from this perspective that a re-launch of public-private partnerships (PPPs) is taking place. PPPs are not a novel form of investment financing, but they have had a vigorous boost in the last decade, hand in hand with the agenda of the Sustainable Development Goals (SDGs).