Working together to ensure reliable, affordable and clean energy

energy Russia energy china flag

Glossary Glossary

The following definitions reflect those used by the International Energy Agency (IEA); definitions used by other organisations and publications may vary.

R&D

research and development

RD&D

research, development and demonstration

RDD&D

research, development, demonstration and deployment

RE

renewable energy (renewables)

RECaBS

renewable energy costs and benefits for society

REP

rural electrification policy (India)

RES

renewable energy sources

RET(s)

renewable energy technology(ies)

ROW

rest of the world

RPK

revenue passenger kilometers

renewable energy

energy that is derived from natural processes (e.g. sunlight and wind) that are replenished at a higher rate than they are consumed. Solar, wind, geothermal, hydro, and biomass are common sources of renewable energy.