Renewable Energy Certificates (RECs) are a measure of power generation in MwH, merely a certificate that a measured volume of renewable energy was produced. However, RECs do not offset emissions, most notably because there is no “additionality” to REC projects, meaning this is “business as usual”. Carbon offsets on the other hand are a measure in metric tons of CO2-equivalent emissions that have been permanently reduced or eliminated, and with strict third-party protocols that ensure projects are additional to business as usual, and would not otherwise occur without the carbon offset investment.