Energy forestry is a form of forestry in which a fast-growing species of tree or woody shrub is grown specifically to provide biomass or biofuel for heating or power generation.

Energy flux is the rate of transfer of energy through a surface.

Energy flow is the flow of energy through living things within an ecosystem.

Energy engineering or Energy Systems Engineering is a broad field of engineering dealing with energy efficiency, energy services, facility management, plant engineering, environmental compliance, sustainable energy and renewable energy technologies.

Energy energetics is the scientific study of energy in general

Energy elasticity is a term used with reference to the energy intensity of Gross Domestic Product.

A drawworks is the primary hoisting machinery component of a rotary drilling rig.

Drawing is a metalworking process which uses tensile forces to stretch metal, glass, or plastic.

A dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment, such as air or water.

A planned community being built where part of the infrastructure will contain a central solar heating system with seasonal thermal energy storage capability.

Turbines where the blades are downwind of the tower.

On the opposite side from the direction from which the wind blows.

A measure of time that a machine or system is not operational due to breakdown or maintenance requirements

The oil and gas industry is usually divided into three major sectors: upstream, midstream, and downstream.

A downhole heat exchanger, also called a borehole heat exchanger, is a heat exchanger installed inside a vertical or inclined borehole. It is used to capture or dissipate heat to or from the ground.

A term used to describe tools, equipment, and instruments used in the wellbore, or conditions or techniques applying to the wellbore.

Doubly-fed electric machines also slip-ring generators are electric motors or electric generators, where both the field magnet windings and armature windings are separately connected to equipment outside the machine.

A double-circuit transmission line carries conductors two circuits

Radiation dosimetry in the fields of health physics and radiation protection is the measurement, calculation and assessment of the ionizing radiation dose absorbed by an object, usually the human body.

A double-acting cylinder is a cylinder in which the working fluid acts alternately on both sides of the piston.