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Public-images-osm logo.svg power = plant
Three mile island 062010.jpg
Places where power is produced with power=generator help.
Group: Power
Used on these elements
should not be used on nodesshould not be used on waysmay be used on areasmay be used on relations
Useful combination
Status: ApprovedPage for proposal

A power station (601-03-01, also referred to as a generating station, power plant, or powerhouse) is an industrial facility for the generation of energy (electricity, useful heat...).

This page explains how we can map all power plants around the world, distinguished in two classes : enclosed and dispersed.

Enclosed power plant

Functional chart of a conventional power plant

A power=plant is tagged as a Area around the power plant perimeter (usually bordered by fence). We may use the following attributes:

Key Value Comment Recommendation
power plant Defines this area as a power plant. mandatory
name Individual name The name by which the power plant is known. recommended
operator Operator Name of the company that operates the power plant. recommended
start_date Date (YYYY-MM-DD) Date when the construction was finished, using Wikipedia-16px.png ISO 8601. recommended
landuse industrial Apart of Wikipedia-16px.png wind farms, a power plant is an industrial facility. recommended if not already inside a bigger landuse=industrial, else optional
plant:output:* Rated output of the facility The rated output of the whole facility often available in operator public documentation. The tagging is consistent with generator:output=*: a co-generation plant would have for example plant:output:electricity=* and plant:output:steam=* keys. They accept numeric values or yes if the exact rating is unknown. recommended when using simple tagging
plant:source The primary fuels used in this plant The aggregate of fuels used by individual generators within the plant. Multiple fuels should be separated by semicolons (;). Example: plant:source=coal;gas recommended

In this case, spatial capabilities of the database would enable us to retrieve features which are inside the power plant's perimeter. According to the functional chart, we must find object tagged as power=generator + generator:plant=output inside and attributes must be defined consistently with power plant's ones.

Many other stuff (buildings, substations), introduced all along this proposal is recommended or optional.

We can compare the total rating of a power plant, specified in plant:output=* and addition of all the generator:output=* values of its generator members :

Please note that this comparison is made on two axis : The first by comparing all kind of output in both plant and generators (it's a problem to have a plant with yes whereas there is no generator with generator:output:electricity=* for instance). The second axis is on the amount of each kind of power made as above rules.

As discussed on mailing list, we mustn't try to bind stuff (like outside power station for instance) to an enclosed power plant if it is not in the power plant perimeter. We'd better to create two independent objects. More information here: http://lists.openstreetmap.org/pipermail/tagging/2013-April/013321.html

In some situations power plant could expose two or more distinct perimeter. This can be mapped with Relation:multipolygon Relation and definitely fulfill the dispersed power plant model introduced below.

Plant area/perimeter

As discussed on tagging mailing list, power plants areas and perimeters would be pretty hard to map when many different operators share the same location on a generation site.


A simple rule to make the distinguishing between operators is to create a separate area for each one. Two or more power plants would directly be created.

In general, only one company is operating a power plant so if two or more operators are present on a site, we could have two different power plants or two different components for power generation. In all cases we mustn't map it in a single one area. Each area will have different operator=* values and potentially as many name=*. The key point is still the ownership of the land occupied by the power plant.

Furthermore and often, room is reserved besides actual power plants for future extensions. This room should be concerned by the power plant area right now since it's fenced as the main production site.

Finally, Relation:multipolygon Relation doesn't match these operator consideration since operator distinguishing MUST be done.

Dispersed facilities power plants

Functional chart of a dispersed power plant
Lillgrund Wind Farm, Sweden

Wind, tidal and photovoltaic power plants may consist in a group of several turbines or solar panels in the same location used for production of electricity.
Each turbine or panel would be tagged as power=generator.
The land between generators may be used for agricultural or other purposes while it may correspond to the ocean's ground for tidal farms.
A wind/solar farm may also be located offshore instead of a tidal farm which is always located on the sea ground.
When there are several fenced areas around the power plants sites, Relation:multipolygon Relation should be used.

Such a farm is tagged as a Relation using type=site + power=plant. Computing of total farm rating is done by adding all the generator:output:* values of its generator members which are described with generator:plant=output (output generator, see Generator chapter for more information).

Way or Node Recurrence? Refers to Recommendation
Node Area Relation 1 or more All (output or intermediate) power generators of the power plant. mandatory
Area Relation 0 or more All substations of the power plant. recommended

Please have a look to power=generator to know how to best describe each generating unit of the power plant.


This key may be hard to use or understand. Take a look to all those quick examples to find out how it's simpler than it seems ;)

Renewable power

Power plant Tagging Descritption OSM ref
Verrerie solar power plant, France Relation A 34ha solar farm producing 24 MW of electricity when sun comes up in south of France. With a little aerial imagery help, generators are taken as groups of solar cells for sake of simplicity. It is actually possible to use Node for each photovoltaic module but it's really expensive in mapping time.

The relation accepts two closed and fenced perimeters, all generators and a transmission substation connecting to the power grid

Relation 3501886




See also