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Available languages — Tag:power=generator
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Public-images-osm logo.svg power = generator
Eoliennes Gaspesie.jpg
A device converting kind of power to another. Edit this description in the wiki page. Edit this description in the data item.
Group: Power
Used on these elements
may be used on nodesshould not be used on waysmay be used on areasshould not be used on relations
Useful combination
Incompatible with
Status: approvedPage for proposal

A generator (IEC 151-13-35) is a device that converts one form of energy to another.

For example: mechanical energy or sun light to electricity.


A power=generator is tagged as a node, area or even multipolygon relation, on the generator itself, if visible (wind turbine, gas turbine, single solar panel...), or on the smallest building containing it (nuclear reactor, hydroelectric turbine...). Large photovoltaic power plants may group solar panels blocks in a single multipolygon.

Furthermore, generators should be tagged with frequency=* since they can operate at different frequencies than the common one used on national grids. Indeed, some power plants can fed train transmission lines which often live at different frequency.

Please note that generator:output=* gives the nominal maximum available rating for the given generator. It's the easiest information we can get. Effective rating would be hard to compute or to obtain from power plans operators.

Key Value
power generator
generator:source Power source of the generator
generator:method Method of power generation
generator:type Type of generator
optional generator:plant When the generator is part of a power plant, use output when it produces output power of the plant or intermediate when it only feeds other generators.
name Given name of the generator
operator Operator's name
generator:output Output power and its rating for the given generator

How to map


Add a node at the centre of the power generator or preferably create an area around the boundary of the generator using aerial photography if available. Tag with power=generator and also a name=* and operator=* if known as explained above. Use power=plant to tag the whole facility.

Energy source

The energy source for the generator should be identified using the generator:source=* tag (power_source=* is obsolete).

See generator:source=* for a complete list of approved values

Method of generation

The tag generator:method=* is used to describe the technical process or method used to convert the energy source into the energy output.

See generator:method=* for a complete list of approved values.

Type of generator

A new attribute is added, generator:type=*. This attribute is intended to define the type of generator among a single source/method. As a concrete example of what a type is, think about of rendering a map of all nuclear reactors of the same type as those used in Fukushima.

See generator:type=* for a complete list of approved values.

Output power rating

The tag generator:output=* can be used to specify the forms of energy generated, and the rating if known. You can simply use yes as a value if the precise numerical rating is unknown.

Power generators can output multiple forms of energy. For example, a boiler will only output hot water, but a combined heat and power plant will typically output hot water and electricity. Add as many values as are relevant.

If the rating of the output is known, add a numerical value followed by the unit. Otherwise simply add 'yes'.

generator:output:electricity=* yes / x W / x kW / x MW / x GW
generator:output:heat=* yes / x W / x kW / x MW / x GW
generator:output:hot_water=* yes / x W / x kW / x MW / x GW
generator:output:hot_air=* yes / x W / x kW / x MW / x GW
generator:output:cold_water=* yes / x W / x kW / x MW / x GW
generator:output:cold_air=* yes / x W / x kW / x MW / x GW
generator:output:compressed_air=* yes / x W / x kW / x MW / x GW
generator:output:steam=* yes / x W / x kW / x MW / x GW
generator:output:vacuum=* yes / x W / x kW / x MW / x GW
generator:output:biogas=* yes / x W / x kW / x MW / x GW


This tag used to be used to map whole power plants, often as an area.
A recent approval process introduced power=plant for such features and make power=generator dedicated to power generators, the devices inside power plants.
Many power=generators currently correspond to power plants instead of hosted generators. It is recommended to carefully replace them with power=plant tag according to your knowledge of the environment.
Don't do mass edit as for preserving the quality of data.


For example to tag a 15 MW biomass gasification combined-heat-and-power generator use:

Key Value
power generator
generator:source biomass
generator:method gasification
generator:type gas_turbine
generator:plant output
name biomass generator usual name (see also ref=*)
operator operator's name
generator:output:electricity 5 MW or yes if unknown
generator:output:hot_water 10 MW or yes if unknown

Or to tag a solar thermal panel use:

Key Value
power generator
generator:source solar
generator:method thermal
generator:type solar_thermal_collector
generator:plant output
name thermal solar panel usual name (see also ref=*)
operator operator's name
generator:output:hot_water 200 kW or yes if unknown

Or to tag a wind turbine (a modern electricity-generating wind mill):

Key Value
power generator
generator:source wind
generator:type horizontal_axis
generator:plant output
height height=133 - center of rotor is 133 meters above ground
rotor diameter rotor:diameter=60 - rotor diameter is 60 meters
name modern wind mill usual name (see also ref=*)
operator operator's name
generator:output:electricity 3 MW or yes if unknown

Maps rendering Power Generators

See also