Basin closure with dams are out of vogue. But new legislation could clear the way for more small ones. Small hydropower projects can produce electricity without emitting greenhouse gases. And if they’re placed carefully, they can have minimal impact on the environment. So many communities see them as a crucial part of their renewable energy portfolio. Iran had been planned to develope quite a lot of small, medium and large hydropower project. The PCE was involved in EPC part of a cascade 20 MW one.