Infrastructure fund managers are sticking fast to their high private-equity style fees, according to a new survey from Preqin, despite pressure from investors, who argue infrastructure projects are low-risk, highly-regulated and require much less financing skill than a buyout fund.

According to Preqin, a consulting firm that specialises in market research on private equity and infrastructure investments, the median average management fee for an infrastructure fund in 2011 is 2% of assets - which is also the norm in private equity or hedge funds.