Borealis Infrastructure, the infrastructure investment manager of OMERS, the pension plan for municipal workers in Ontario, Canada, has today announced the purchase of an additional 5.5% interest in Kemble Water Holdings Ltd, the ultimate holding company of Thames Water.

Borealis Infrastructure has bought the stake from AMP Capital, one of Australia's largest retail and corporate pension providers.

OMERS became an investor in Thames Water less than two months ago, and following completion of the transaction announced today, will increase its overall interest to 23%. Investments are aimed at steady returns to help deliver strong and sustainable pensions to OMERS members.

The transaction is expected to close later this year.

Borealis Infrastructure and OMERS Private Equity invests globally in infrastructure and private equity assets on behalf of OMERS, the pension plan for Ontario’s municipal employees.

OMERS is one of Canada's largest pension funds with net assets of more than C$85 billion.