Premier Transco Limited was formed to develop the SNIP, a 135 km pipe (40.4 km under sea) with a diameter of 0.61 m. Construction lasted three years (1994-1996) and was completed to time and on budget. Ballylumford converted to natural gas in 1996 and the first connections to Phoenix customers occurred in 1997.
In 1997 British Gas sold a 24.5% share to Keyspan Energy. As BG Group plc the company sold a further 24.5% share to East Surrey Investments in 2001. In 2003 East Surrey Investments bought BG's 51% share and Keyspan's 24.5% share to take full control of Phoenix Natural Gas.
In October 2005, PNG was purchased by Kellen Acquisitions Limited, a company formed by private equity managers Terra Firma Capital Partners.