Boiler feedwater is an essential part of boiler operations.

A boiler explosion is a catastrophic failure of a boiler.

Boiler blowdown is water intentionally wasted from a boiler to avoid concentration of impurities during continuing evaporation of steam.

The BN-800 reactor is a sodium-cooled fast breeder reactor, built at the Beloyarsk Nuclear Power Station, in Zarechny, Sverdlovsk Oblast, Russia.

A blowout preventer is a specialized valve or similar mechanical device, used to seal, control and monitor oil and gas wells to prevent blowouts, the uncontrolled release of crude oil or natural gas from a well.

A blowout is the uncontrolled release of crude oil and/or natural gas from an oil well or gas well after pressure control systems have failed.

A blowdown stack is an elevated vent or vertical stack that is used to vent the pressure of components of a chemical, refinery or other plant if there is a process problem or emergency.

A blocked rotor test is conducted on an induction motor.

Defined to be the sum of the zone loads.

Horizontal movement of a wind turbine blade at the tip while rotating.

Blade element momentum theory is a theory that combines both blade element theory and momentum theory.

A loss of power to end users and communities also known as a power outage and usually a result of a system component failure.

A method of starting or restarting power generation and supply to a power grid without use or reliance on external power supply.

A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.

A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.

Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen or asphalt.

Birefringence is the optical property of a material having a refractive index that depends on the polarization and propagation direction of light.

The biosphere, also known as the ecosphere, is the worldwide sum of all ecosystems.

A biorefinery is a refinery that converts biomass to energy and other beneficial byproducts (such as chemicals).

Biomass to liquid is a multi-step process of producing synthetic hydrocarbon fuels made from biomass via a thermochemical route.