The Private Infrastructure Development Group (PIDG) through its Technical Assistance Facility (TAF) offers the Viability Gap Funding (VGF) – an innovative financing instrument designed to offset part of the up-front preparation costs of pro-poor infrastructure investments in challenging environments. TAF provides technical assistance and capacity building to the PIDG facilities to make their projects commercially viable. An example of how the VGF financing instruments can work in practice is provided by the Coc San Hydropower project in Vietnam, which was revitalised following a US$5 million grant by TAF in 2013.