|This tag is ambiguous (see below) and it has been recommended to stop using it.
For substations use power=substation. For power plants (power stations) use power=plant. For power generating equipment use power=generator
| +/- power=station
The tag "power=station" was used as shorthand tagging for electrical distribution substations, which are facilities that perform voltage conversion and switching as part of an electrical transmission or distribution network. Since January 2008, power distribution and conversion facilities should be tagged as power=substation instead, because this is less ambiguous.
Problematically for the database, the term "power station" is more usually associated with power generation facilities in the English language. For example, the Wikipedia article Power station begins "A power station (also referred to as a generating station, power plant, or powerhouse) is an industrial facility for the generation of electric energy". See the talk page here for a fuller discussion, but in practice this linguistic ambiguity is already known to have caused data errors. Since June 2013, power generation facilities should be mapped using the power=plant or power=generator tags.
Important note on retagging
If you start retagging features now tagged as power=station please follow these guidelines. Don't perform any mass retagging. Each instance must be inspected individually (e.g. from aerial imagery) before being retagged. First of all verify whether it is indeed a substation and not a major power plant (power=plant). A significant number of features tagged as 'station' are actually power plants. Secondly only retag to power=substation if you also add a voltage=* tag. The voltage tag should include at least the highest voltage used in the substation. If you don't know which voltages are used in the substation then better leave the power=station tag in place.