Alastair Hall has resigned as senior managing director and head of Europe at OMERS Infrastructure, the infrastructure investment division of Ontario's $100 billion pension system. The departure follows Hall's involvement in one of the firm's most challenging recent investments, marking a significant leadership change for the Canadian pension fund's European operations.

Hall helped oversee OMERS' troubled Thames Water investment, which ultimately resulted in a complete write-down of approximately $1.3 billion. The UK utility's financial difficulties and regulatory challenges made the investment a major setback for the pension fund, representing one of the largest losses in its infrastructure portfolio. This follows broader market struggles in UK water utilities amid rising debt costs and environmental compliance pressures.

The resignation signals potential strategic shifts at OMERS Infrastructure as it navigates the aftermath of the Thames Water debacle. Leadership changes in infrastructure investing often reflect institutional responses to major portfolio setbacks, particularly when public pension funds face scrutiny over multi-billion-dollar losses.

OMERS will need to rebuild its European leadership team while investors question how the pension system will approach future utility investments. The Thames Water write-down represents roughly 1% of OMERS' total assets, highlighting the risks large pension funds face in infrastructure markets during volatile economic conditions.