Who We Are

Who We Are

We are an independent energy infrastructure company that develops, operates and invests in critical midstream infrastructure. Our business strategy is built on three core themes:

  1. Continue to support and maintain the UK’s energy security

  2. Focus on securing a sustainable net zero energy transition

  3. Work with our industry partners to create sustainable value

Our strategic priorities include securing the long-term viability of our assets, delivering sustained asset evolution, and unlocking future investment to create sustainable value for our shareholders. By doing this, we aim to:

  • Deliver long-term benefits for our employees, customers, communities, shareholders and society.

  • Develop strong partnerships with industry and government to maximise the potential of existing and new energies.

  • Enable a net zero future by developing, operating and investing in the most critical infrastructure.

  • Establish new capability by building the capacity for low carbon hydrogen and other new energies

Our history

Our story began in 2014 when Antin Infrastructure Partners invested in the Central Area Transmission System (CATS) via CATS Management Limited, the entity formed to manage Antin's interests in the North Sea. CATS Management set the strategy, delivering safe and efficient operational and financial performance, and growing the business.

Following further investment in the Central and Southern North Sea, and to reflect its growing portfolio, CATS Management rebranded its business to Kellas Midstream.

In only a few years, we have grown significantly – adding the Esmond Transportation System (ETS), and the Humber Gathering System (HGS) to our portfolio; and welcoming new people to our team, whose expertise has added great value to our organisation.

After such success, in early 2020, Antin Infrastructure Partners sold their interest in Kellas Midstream to global investment and asset managers BlackRock and GIC.

Evolution of Kellas timeline

About our owners

Kellas Midstream is owned by a consortium of two private equity fund managers, BlackRock and GIC.

Private equity infrastructure investors, such as BlackRock and GIC, have access to different sources of capital, the midstream assets they acquire are core to their portfolio, and they are committed to investing in them to build safe, successful and sustainable businesses.

BlackRock logo
  • Kellas is part of BlackRock's Global Energy and Power Infrastructure Funds (GEPIF), which manage $9 billion of investor commitments across three funds (as of September 2021)
  • BlackRock’s GEPIF Group is part of a wider BlackRock Real Assets platform, which manages about $70 billion of investor commitments (as of September 2021)
  • BlackRock has 16,500 employees in 69 cities and more than 30 countries around the world
  • GIC is a leading global investment firm with over US$100 billion invested in multiple asset classes in more than 40 countries
  • Established in 1981 as a private company, GIC manages Singapore’s foreign reserves and is now one of the largest investment management organisations in the world
  • With its disciplined long-term value approach, GIC is uniquely positioned to invest in both the public and private markets, including equities, fixed income, real estate, private equity and infrastructure
  • GIC employs over 1,500 people across offices in Singapore, Beijing, London, Mumbai, New York, San Francisco, Sao Paulo, Seoul, Shanghai, and Tokyo


Kellas Midstream Limited

6th Floor, The Capitol
431 Union St
AB11 6DA

Tel: +44 (0) 1224 084520

Pipeline Emergency

To report a pipeline emergency please call +44 (0)1642 546404 and ask for the Operations team.