Such agencies generally engage in activities such as establishing dialogues and platforms for sustainability, building capacity of companies in-country to address environmental issues, raising awareness of environmental risks and opportunities, and contributing to the strengthening of the enabling environment for green private sector development, often working through civil society organisations and partner governments. Bilateral providers also have established partnership models with the private sector based on the provision of matching grants. Providers also make use of challenge funds to stimulate innovation for cleaner technologies and solutions (Box 2.6). The majority of bilateral DFIs typically function as financially self-sustaining institutions and have a unique mandate supported by a range of financial instruments that allow them to bridge the gap between concessional aid and private commercial financiers (OECD, 2014b).