Gareth Rees
Head of Energy Liability
London, UK
Energy operations bring together complex infrastructure, hazardous processes, specialist contractors, and interconnected supply chains—creating liability exposures that can be difficult to predict and severe when losses occur. From upstream and midstream activities to power generation and downstream operations, a single incident can result in significant bodily injury, property damage, and wider third-party impacts.
Mosaic’s energy casualty team provides tailored liability solutions for organizations operating across this technically demanding and evolving sector. Our underwriters combine deep industry knowledge with detailed exposure analysis, assessing operational hazards, contractual relationships, loss potential, and the ways risks can accumulate across sites, projects, and jurisdictions.
We work closely with brokers and insureds to understand the realities of each operation and structure responsive solutions for complex energy risks. Disciplined underwriting, meaningful capacity, proactive claims engagement, and long-term partnerships underpin our approach—bringing specialist judgment to a sector where technical understanding matters.