TWh

TWh, or terawatt-hour, is a unit of energy equal to one terawatt of power sustained for one hour. It is frequently used to quantify electricity generation and consumption at national or continental scales. As a derived unit of energy, it measures energy over time rather than instantaneous power.

Conversions: 1 Wh = 3600 J, so 1 TWh = 3.6 x 10^15 joules. It also equals 1,000,000 megawatt-hours (MWh) or 1,000 gigawatt-hours (GWh). In larger terms, 1 TWh equals 0.001 petawatt-hours (PWh) and about 0.0036 exajoules (EJ).

Relationship to power and time: Energy in TWh equals average power in terawatts multiplied by the duration in hours. For example, sustaining a 1 TW plant for a year produces about 8,760 TWh (1 TW × 8,760 h).

Usage: The unit is widely used to report annual electricity generation or consumption by countries, regions, or companies. It is less common for non-electrical energy in fuels, which is usually expressed in joules, BTUs, or exajoules.

Notes: It is important to distinguish energy (TWh) from power (TW).