A renewable energy certificate (REC) is a document that verifies that a unit of electricity was generated from a renewable energy source, such as solar or wind power. RECs allow people to support the use of clean, renewable energy by purchasing them and offsetting their carbon emissions and show their commitment to sustainability. When electricity is generated from a renewable energy source and added to the grid, a REC is issued to represent the environmental and social benefits of that renewable electricity. Because the electricity we receive through the utility grid does not specify its source or how it was generated, RECs are an important tool for assigning ownership and accountability for renewable electricity. For consumers who wish to use renewable electricity, RECs provide a way to verify and document their use of clean energy, even if it is generated from off-site resources.