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Heat Exchanger

This is a device that transfers heat from one fluid (either gas or liquid) to another or into the environment.


These are flat sun-tracker mirrors that are used to concentrate and reflect the sun's energy into a central tower.

High-Temperature Collector

These are solar thermal collectors that can operate at 180 degrees Fahrenheit or higher.

Horizontal axis WT

These are Wind Turbines taht have a rotor axis significantly parallel to the wind flow.


This is a unit for measuring the rate of power (or work) equivalent to 746 watts or 33,000 foot-pounds per minute

Hot Dry Rock

Hub (WT)

This is the fixture that is for attaching the blades to the rotor shaft

Hub-height (WT)

This is the height of the center of the swept area of the Wind Turbine rotor above the terrain.

Hydroelectric Power Plant

These are power plants that use moving water in order to power the turbine generator, in order to produce electricity.

Hydraulic Fracturing

This is the fracturing of a rock at depth with fluid pressure. This is typically achieved by pumping water into a well at very high pressure. Hydrothermal brecciation can occur when vapor pressure rises high enough to cause fracturing under normal conditions.


This is a odorless, colorless and highly flammable gaseous element.


Energy that is produced from moving water.