Marsh Risk Launches Excess Casualty Facility for US Digital Infrastructure

Why It Matters

By filling a gap in excess casualty capacity for data‑center and digital‑infrastructure builds, Marsh Risk helps developers mitigate escalating liability risks and accelerates project financing.

Key Takeaways

• Nimbus Casualty provides $75M excess liability capacity.
• Attachment starts at $25M for digital infrastructure projects.
• Backed by Lloyd’s and London insurer panel.
• Extends Marsh Risk’s Nimbus construction insurance platform.
• Enhances coverage certainty and streamlines claims negotiation.

Pulse Analysis

The digital infrastructure boom in the United States has intensified demand for specialized insurance solutions that can keep pace with soaring project values and complex liability profiles. Traditional construction policies often leave a coverage gap once primary limits are exhausted, exposing developers to potentially crippling lawsuits. Nimbus Casualty directly addresses this shortfall by offering a sizable excess layer that activates after $25 million, ensuring that high‑stakes data‑center builds retain robust protection throughout construction and beyond.

Marsh Risk’s strategic use of its XSellence excess casualty form differentiates Nimbus Casualty from generic excess products. The form integrates seamlessly with the broader Nimbus construction suite, allowing clients to maintain a single, cohesive risk management program rather than juggling disparate policies. Backed by a panel of Lloyd’s and London carriers, the facility benefits from deep capital pools and global underwriting expertise, which translates into faster placement, clearer terms, and more predictable claims outcomes for U.S. developers navigating an increasingly litigious market.

For investors and lenders, the introduction of a dedicated excess casualty facility reduces underwriting uncertainty and can improve financing terms for large‑scale digital projects. By mitigating tail‑risk exposure, developers can focus on delivering critical infrastructure without the distraction of potential liability overruns. As the sector continues to expand, Nimbus Casualty positions Marsh Risk as a go‑to partner for end‑to‑end construction and casualty coverage, reinforcing its market leadership in a niche yet rapidly growing insurance segment.

Marsh Risk Launches Excess Casualty Facility for US Digital Infrastructure

February 19, 2026

Marsh Risk, a business of broker Marsh, announced the launch of Nimbus Casualty, a new insurance facility providing clients with excess general liability protection during the construction phase of U.S.–based digital infrastructure projects.

The facility offers up to $75 million in capacity, with a minimum attachment point of $25 million, and is supported by a panel of Lloyd’s and London insurers. Leveraging Marsh Risk’s proprietary XSellence excess casualty form, Nimbus Casualty delivers follow‑form coverage across a client’s excess casualty program, enhancing coverage certainty and streamlining claims negotiation.

The launch of Nimbus Casualty follows the recent expansion of Marsh Risk’s market‑leading large‑scale data‑center construction insurance facility Nimbus, which offers up to $2.7 billion in limits of traditional construction all‑risks, delay‑in‑start‑up, property damage, and business‑interruption cover.

“The U.S. casualty market presents increasing complexity and challenges, especially for digital infrastructure clients managing large‑scale, high‑value projects with long‑term liability exposures,” said Paul Woodward, head of casualty, Marsh Risk international placement. “With Nimbus Casualty, we combine Marsh Risk’s market‑leading construction expertise with our market‑leading excess casualty form to provide clients with the advice and coverage certainty they need to efficiently safeguard their digital infrastructure investments.”