This Practice Note introduces waste to energy infrastructure projects. It looks at procurement routes (including via waste PFI/PPP projects, where an authority provides the waste, and so called ‘merchant waste’ projects where the waste is sourced from the private sector) and forms of contract commonly used in this sector and also at key areas of risk and negotiation. It includes waste to energy projects using incineration of waste (often referred to as ‘energy from waste’ (or EfW)) and using non-incineration methods like anaerobic digestion or advanced gasification. The Practice Note highlights key points in these contracts that lawyers need to be aware of and some of the issues that funders and investors will take into consideration.