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===Power supply===
The trams are electrically powered from 750 [[Volt|V]] [[Direct current|DC]] [[overhead line]]s.{{sfn|Ogden|Senior|1992|p=102}} Between 1992 and 2007, electricity for the Metrolink system was procured by the operator, based on price only.<ref name=case/> In 2007, GMPTE changed the contractual requirements to ensure that [[sustainable energy|sustainable power]] would be factored into choosing an energy supplier, and in July 2007, Metrolink became the first light rail network in the UK with electricity supplied entirely from sustainable energy via [[hydropower]].<ref name=case/> Now, energy for the system is generated by biomass.<ref>{{cite web|url=http://www.tfgm.com/t2k/Pages/TfGM-Green-Facts.aspx|title=Pages – TfGM Green Facts|access-date=24 December 2014|archive-url=https://web.archive.org/web/20141225012132/http://www.tfgm.com/t2k/Pages/TfGM-Green-Facts.aspx|archive-date=25 December 2014|url-status=dead}}</ref>
===Depots===
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