Renewable Energy Certificate System

The Renewable Energy Certificate System (RECS) was a voluntary system for international trade in renewable energy certificates that was created by RECS International to stimulate the international development of renewable energy. It advocated the use of a standard energy certificate to provide evidence of the production of a quantity of renewable energy and provided a methodology that enables renewable energy trade, enabling the creation of a market for renewable energy and so promoting the development of new renewable energy capacity.

Source: Wikipedia — Renewable Energy Certificate System (CC BY-SA 4.0)