The development of an environmental infrastructure is a measure of the national Single Development Programme, which sets the priorities for the use of EU regional aid in Estonia. One of the submeasures of the environmental infrastructure development is to support the investments to installations using RES. The projects aiming to establish a grid connection for RES-E generation installations are preferred. The Environmental Investment Centre carries out an open call of proposals once per year. Almost all legal persons are eligible to submit their projects. An inter-ministerial working group evaluates the proposals. The measure is partially supported from European Regional Development Fund (ERDF).