Glossary Glossary

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

H2

hydrogen

H20

water

HAPs

hazardous air pollutants

HC

hydrocarbons

HDI

Human Development Index

HDV

heavy-duty vehicle

HDVC

high voltage direct current

HFCV

hydrogen fuel cell vehicle

HFO

heavy fuel oil

hi NUC

high nuclear scenario (in IEA modelling and publications)

hi REN

high renewables scenario (in IEA modelling and publications)

HLW

high-level waste

HPI

Human Poverty Index

HSPF

heating seasonal performance factor

HSR

high-speed rail

HTS

high temperature superconductor

HVAC

heating, ventilation and air conditioning

HVC

high-value chemical

HVDC

high-voltage direct current line       

hard coal

coal of gross calorific value greater than 5 700 kilocalories per kilogramme on an ashfree but moist basis. Hard coal can be further disaggregated into anthracite, coking coal and other bituminous coal.

heat

In IEA energy statistics, heat refers to heat produced for sale only. Most heat included in this category comes from the combustion of fuels, although some small amounts are produced from geothermal sources, electrically powered heat pumps and boilers.

heat energy

Heat is obtained from fuels combustion, nuclear reactors, geothermal reservoirs, capture of sunlight, exothermic chemical processes and heat pumps which can extract it from ambient air and liquids. It may be used for heating or cooling or converted into mechanical energy for transport vehicles or electricity generation. Commercial heat sold is reported under total final consumption with the fuel inputs allocated under power generation.

heavy petroleum products

heavy petroleum products include heavy fuel oil.

hedge funds

an investment fund opened to a limited range of investors. These funds aggressively manage a portfolio of investments that use advanced investment strategies such as leveraged, long, short and derivative positions with the goal of generating high returns.

Human Poverty Index

measures life expectancy at birth, adult literacy and & school enrolment, and per-capita GDP (adjusted for purchasing power parity [PPP]). HPI-1 is a modified HPI for developing countries that measures probability at birth of not surviving to 40, adult literacy, % of population without clean water and % of children underweight.

hydro

the energy content of the electricity produced in hydropower plants assuming 100% efficiency.

hydropower

the electrical energy derived from turbines being spun by fresh flowing water. This can be from rivers or from man-made installations, where water flows from a high-level reservoir down through a tunnel and away from a dam. For more information, click here.

Ha

hectare (10 000 m2)