The Gold Standard (GS) for voluntary offset projects was launched in 2006. It is a standard and certification body that works to catalyze more ambitious action for climate security and sustainable development.
Guarantee of Origin certificates (GOs) are renewable power certificates that can be used to document and report on the energy you consume that comes from a renewable source.
A REGO (Renewable Energy Guarantee of Origin) is a certificate similar to the Guarantee of Origin certificate but used in the United Kingdom.
I-REC, International Renewable Energy Certificates are similar certificates to the European Guarantee of Origin Certificates.
REC or Renewable Energy Certificates are certificates produced by renewable electricity generators that can be used to prove the green or renewable source of the electricity that someone is buying.