In order to reach Energy targets, set by the EU and to attract foreign invest- ments in energy sector Member States of the EU adopted various meas- ures such as direct or indirect support lowering the costs of capital. Since new technologies signi cantly reduced the costs of development, Member States adopted legal reforms of their renewable legislations. The Energy Charter Treaty provides a multilateral framework for energy cooperation, which is unique under international law. It is designed to promote energy security through the operation of more open and competitive energy markets. In 2015 renewable disputes under the Energy Charter Treaty reached 32 cases. This paper focuses on investment protection provisions of the Energy Charter Treaty in light of the Charanne case, the rst pub- lished award regarding investment in the sector of renewable energy under the Energy Charter Treaty rendered on 21 January 2016.