The 2009 OECD Working Paper „Pension Fund Investment in Infrastructure‟ (Inderst 2009) discusses barriers to pension funds‟ investment in infrastructure projects in general – which can be seen to apply also to green investments. These include a lack of knowledge and experience with infrastructure investments (including direct investment and other investment vehicles used), a lack of transparency and data related to infrastructure investments, potentially high fees, additional risks relating to such investments (including regulatory, social and political risks), and other regulatory constraints (by asset class, due to liquidity and diversification requirements, solvency constraints etc.) .
