This paper focused on the delivery mechanisms for bilateral, multi-lateral, host government subsidy, and consumer cross-subsidy funding to enhance private sector investment. However, the specific source of funds is not deemed to be especially relevant for the purposes of this working paper. Focus on some of the useful characteristics of Output-Based Aid (OBA) experience to date that may be relevant. Propose an option for how OBA experience could be used to deliver national and programmatic supports to projects in middle- and low-income countries in coordination with other multi-lateral development bank instruments such as concessional loans and credits. This working paper does not: specifically address strengths and weaknesses of the clean development mechanism and only briefly touches on issues with using carbon finance in the current market. Carry out an assessment of experience with feed-in tariffs or advanced market commitments, or indeed other results orientated schemes.