Tag 'ref = PO'

• 1: addr:country
• 1: operator:wikidata
• 1: roof:shape
• 1: addr:postcode
• 1: building
• 1: operator
• 1: addr:city
• 1: frequency
• 1: voltage
• 1: addr:suburb
• 1: addr:housenumber
• 1: ref
• 1: substation
• 1: name
• 1: short_name
• 1: addr:street
• 1: power