| $ | All $ in US$ unless otherwise noted |
| CCUS | carbon capture utilization storage |
| CH4 | methane |
| CO2 | carbon dioxide |
| COP21 | United Nations 21st Conference of the Parties |
| EEA | European Energy Agency |
| ETC | Energy Transitions Commission |
| ETI | Energy Transition Index |
| EU | European Union |
| EU28 | 28 Member States of the European Union |
| g | gram |
| G20 | Group of governments and central bank governors from 20 leading economies |
| GDP | gross domestic product |
| GHG | greenhouse gas |
| GJ | gigajoule |
| GW | gigawatt |
| HHI | Herfindahl-Hirschman Index |
| IEA | International Energy Agency |
| IEF | International Energy Forum |
| IISD | International Institute for Sustainable Development |
| IMF | International Monetary Fund |
| IRENA | International Renewable Energy Agency |
| kg | kilogram |
| kWh | kilowatt hour |
| LNG | liquefied natural gas |
| MJ | megajoule |
| mmbtu | 1 million British Thermal Units (BTU) |
| Mt | metric ton |
| NDC | nationally determined contribution |
| OECD | Organisation for Economic Co-operation and Development |
| PJ | petajoule |
| PM2.5 | particulate matter less than 2.5 micrometers in diameter (also called fine particles) |
| PPP | purchasing power parity |
| SEforALL | Sustainable Energy for All initiative (co-chaired by the United Nations and World Bank Group) |
| TPES | total primary energy supply |
| UNFCCC | United Nations Framework Convention on Climate Change |
| WB2C | world below 2 degrees |
