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Machine Availability

Expected average turbine availability of a wind farm over the life of a project.


This is naturally occurring molten rock that is generated within the earth.


This is any piece of steel, iron, etc that has the ability to attract steel or iron.


This is the inspection and regular keeping of a Photovoltaic Plant in order to ensure stable production.


The process of fabrication and assembly within a workshop.


Entity that is manufacturing the renewable energy product

Marginal Cost

This is the change in the cost that is associated with the change in the quantity produced or supplied.

Mass Burner

One-chamber combustion system that incinerates municipal solid waste under excess air conditions.

Maximum power

Highest amount of electrical power delivered under normal operations.

Mean wind speed

Wind speed averaged over a period of time

Mechanical Energy

Energy of motion to produce work

Mechanical Power

Power produced from motion

Medium-Temperature Collectors

These are solar thermal collectors designed to operate from 140 to 180 degrees Fahrenheit but also has the ability to operate to temperatures as low as 110 degrees.

Megajoule (MJ)

One million Joules

Megawatt (MW)

One million watts

Megawatt hour

The measure of 1,000,000 watts over a period of 1 hour. Energy (Wh) divided by time (h) equals power (W).


Organic chemical compound that has a sulfur like odor that is added in with natural gas before given to a consumer. This is done to serve as a safety device so that if there is a leak, it can be detected through its odor.

Merchant Facilities

These are high-risk, high-profit facilities that operate at the notion of the market.


Most common gas formed in coal mines

Methyl Tertiary Butyl Ether (MTBE)

Flammable, color-less, liquid oxygenated hydrocarbon ((CH3)COCH3). Produced by reacting methanol with isobutylene.


This is a concept to increase the efficiency of solar cells. This is done by installing a blue light in the first step and a red light in the second step.

Miles Per Gallon (MPG)

Measure of vehicle fuel efficiency.

Mobile Home

Trailer that is used as a permanent resident.

Modular Burner

Small two-chamber combustion system used for the incineration of solid waste

Monocrystalline solar panel

Monocrystalline (also called single crystal) panels use solar cells that are cut from a piece of silicon grown from a single, uniform crystal. Monocrystalline panels are among the most efficient yet most expensive on the market. They require the highest purity silicon and have the most involved manufacturing process.

Monocrystalline solid

This is referred to as a single crystal.


Particles that have two or more atoms joined together.

Multifamily Dwellings

Condominiums and apartment buildings

Municipal Solid Waste (MSW)

Collected for landfilling, including organic matter, paper, plastic, metals, etc. It does not include certain industrial waste or agricultural wastes.

Municipal utility or Muni

This is a utility that is owned by a city.