On 15 November 2020, the Trans Adriatic Pipeline (TAP) began commercial operations. TAP – the final section of Europe's US$40 billion Southern Gas Corridor from Azerbaijan – will ultimately deliver 10 bcm per year from BP’s Shah Deniz Phase Two megaproject in the Caspian Sea. Commissioning of TAP’s initial capacity follows four and a half years of construction, EUR 4.5 billion of capex and a variety of obstacles – especially in Italy, where the pipeline ends. This is a long-awaited milestone for all stakeholders – investors, upstream source of supply, host governments and offtakers alike. TAP has launched in a turbulent European market environment. But it is a long-term project with expansion plans and wide-ranging significance. We address what its commissioning means from all the key angles.