Commodities

World Energy Exchange
Retail electricity
Retail natural gas
Wholesale electricity
Wholesale natural gas
Physical green power

World Green Exchange
US:
Renewable Energy Certificates (RECs)
Verified Emissions Reductions (VERs)
SO₂ and NOx Allowances
Regional Greenhouse Gas (GHG) compliance units

Kyoto-compliant countries:
Assigned Amount Units (AAUs)
Certified Emissions Reductions (CERs)/Verified Emissions Reductions (VERs)
Emissions Reduction Units (ERUs)

European Union:
EU Emissions Trading Scheme Allowances (EUAs)

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