Micro hydro is a type of hydroelectric power that typically produces from 5 kW to 100 kW of electricity using the natural flow of water. These installations can provide power to an isolated home or small community, or are sometimes connected to electric power networks, particularly where net metering is offered.

Micro combined heat and power, micro-CHP, µCHP or mCHP is an extension of the idea of cogeneration to the single/multi family home or small office building in the range of up to 50 kW.

The inventor of the Faraday Disk using electromagnatism to generate electricity.

The metre is the base unit of length in the International System of Units (SI).

Methanol fuel is an alternative biofuel for internal combustion and other engines, either in combination with gasoline or independently.

Methanol, also known as methyl alcohol amongst other names, is a chemical and the simplest alcohol commonly used as an antifreeze.

Methane is a chemical compound with the chemical formula CH4.

Meter data management (MDM) refers to software that performs long-term data storage and management for the vast quantities of data delivered by smart metering systems.

Meter data analytics is the analysis of data emitted by electric smart meters that record consumption of electric energy.

Meteorology is a branch of the atmospheric sciences which includes atmospheric chemistry and atmospheric physics, with a major focus on weather forecasting.

Metamorphic rocks arise from the transformation of existing rock to new types of rock, in a process called metamorphism.

The strain gauge is generally glued (foil strain gauge) or deposited (thin-film strain gauge) onto a membrane.

Metal fuel is created when a metal is ground into a powder, which is then fed into a burner.

A metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well.

Mesoscale meteorology is the study of weather systems smaller than synoptic scale systems but larger than microscale and storm-scale cumulus systems.

Mercury-wetted slip rings, noted for their low resistance and stable connection use a different principle which replaces the sliding brush contact with a pool of liquid metal molecularly bonded to the contacts.

Melting, or fusion, is a physical process that results in the phase transition of a substance from a solid to a liquid.

The melting point of a substance is the temperature at which it changes state from solid to liquid.

A Megohmmeter or insulation resistance tester is a special type of ohmmeter used to measure the electrical resistance of insulators.

Electric power unit equal to one million watts used for one hour.