In the 1990s, thermoelectric generation has come to lead a system that was dominated by hydropower: Hydropower plant capacity has gone from 90% to only 30%. The reasons for this shift are twofold. First, hydroelectric development became more expensive when funding through interest-free loans for its development from International financial institutions was cut. Second, the lower risks and shorter maturity of thermal generation projects, as perceived by private investors, directed generation expansion towards the use of heavy fuel oil and medium speed diesels.