Marsh Risk has introduced a new excess casualty insurance facility designed to support the construction of large-scale digital infrastructure projects across the United States.
The facility, named Nimbus Casualty, provides up to $75 million in excess general liability capacity for projects during the construction phase. It attaches at a minimum of $25 million and is backed by a panel of A+ rated insurers from Lloyd’s and the London market.
According to Marsh Risk, the facility leverages its proprietary XSellence excess casualty form to deliver follow-form coverage across a client’s broader excess casualty tower, helping align terms and reduce potential disputes in the event of a claim.
The launch comes as demand for new data centers and other digital infrastructure accelerates across the US, driven by growth in cloud computing, artificial intelligence workloads, and broader digital transformation efforts. These projects are often capital-intensive, complex, and subject to heightened liability exposures during construction, particularly as facilities scale in size and power capacity. Excess casualty coverage has become increasingly important in a US liability environment marked by rising claim severity and litigation trends.
Nimbus Casualty builds on Marsh Risk’s existing Nimbus construction insurance facility, which was recently expanded to offer up to $2.7 billion in limits for construction all-risks, delay in start-up, property damage, and business interruption coverage for large data center developments. By adding excess casualty capacity to the Nimbus platform, Marsh Risk aims to offer a more integrated risk transfer solution for digital infrastructure clients.
Paul Woodward, head of casualty at Marsh Risk International Placement, said the US casualty market presents growing complexity for digital infrastructure developers managing high-value projects with long-term liability exposures.
He noted that the new facility is intended to provide greater coverage certainty and more efficient claims handling.
