Generally used to refer to the amount of energy generated as a percentage of annual consumption.

The Peltier effect is the presence of heating or cooling at an electrified junction of two different conductors.

Pellet fuels are biofuels made from compressed organic matter or biomass. Pellets can be made from any one of five general categories of biomass.

The Pelamis machine is made up of connected sections which flex and bend relative to one another as waves run along the structure.

Peer review is the evaluation of work by one or more people with similar competencies as the producers of the work (peers).

The pebble-bed reactor (PBR) is a design for a graphite-moderated, gas-cooled nuclear reactor.

The Pearl GTL is a gas to liquids plant based in Ras Laffan, Qatar. It is the largest GTL plant in the world.

Peaking power plants, also known as peaker plants, and occasionally just "peakers", are power plants that generally run only when there is a high demand, known as peak demand, for electricity.

Peaking power is when demand is higher than normal during a time period.

The amount of additional generating capacity that can be utilised during peak demand periods. These are generators that are not continuously connected to the power grid.

Peak uranium is the point in time that the maximum global uranium production rate is reached.

Peak shaving refers to leveling out peaks in electricity use by industrial and commercial power consumers. This is possible by temporarily scaling down production, activating an on-site power generation system, or relying on a battery.

Peak oil is the year when the maximum rate of extraction of petroleum is reached, after which it is expected to enter terminal decline.

Demand response is targeted at reducing peak demand to reduce the risk of potential disturbances, avoid additional capital cost requirements for additional plants, and avoid use of more expensive or less efficient operating plants.

The maximum electricity consumption level reached.

Peak coal is the peak consumption or production of coal by a human community.

The path of least resistance is the physical or metaphorical pathway that provides the least resistance to forward motion by a given object or entity, among a set of alternative paths.

Blades are mounted to the rotor at a fixed angle that are designed to twist in high winds which will cause turbulence on the upwind side of the blade, inducing stall.

A patent is a title that gives its owner the legal right to exclude others from making, using, or selling an invention for a limited period of years in exchange for publishing an enabling public disclosure of the invention.

Passive solar building design does not involve the use of mechanical and electrical devices, instead the windows, walls, and floors are made to collect, store, reflect, and distribute solar energy, in the form of heat in the winter and reject solar heat in the summer.