Pranav Hotkar
New York, United States - January 26, 2026 - Marsh, the global insurance brokerage business of Marsh McLennan, has expanded the capacity of its Nimbus data centre insurance facility to USD 2.7 billion, strengthening coverage for large-scale data centre construction projects as costs, complexity, and risk exposure continue to rise across the sector.
The expanded facility increases available limits for construction all-risks, delay in start-up, and business interruption coverage, supporting hyperscale and high-density data centre developments across the United States, the United Kingdom, Europe, Canada, Australia, and New Zealand, according to Marsh’s announcement.
Nimbus was originally launched in June 2025 to address growing gaps in insurance capacity for data centre construction projects, particularly those driven by accelerated timelines, AI-related density requirements, and increasing capital commitments. The latest expansion significantly enhances Marsh’s ability to underwrite some of the world’s largest digital infrastructure builds, where single-site investments increasingly exceed USD 1 billion.
Marsh said the expanded limits are supported by a panel of A-rated insurers, drawing underwriting capacity from both the London insurance market and broader global carrier networks. The structure is designed to provide developers, owners, and financiers with more predictable risk transfer during construction and early operational phases.
Mike Mathews, Global Digital Infrastructure Leader at Marsh, said the enhancement reflects how rapidly the risk profile of data centre projects is evolving as demand for AI-ready facilities accelerates. He noted that higher power densities, supply-chain constraints, and compressed delivery schedules are increasing exposure during construction and commissioning stages.
Industry analysts say the expanded Nimbus facility addresses a critical bottleneck for developers, as traditional insurance programs have struggled to keep pace with the scale of modern data centre campuses. Insurance capacity has become a key gating factor for project financing, particularly for multi-phase hyperscale developments backed by institutional capital.
Marsh said the expanded Nimbus facility is already being deployed on data centre construction programs in the United States, the United Kingdom, and the Netherlands, with additional projects expected to follow in 2026 as developers accelerate build-outs to meet cloud and AI demand.
The move underscores how risk management is becoming a central pillar of data centre development strategy, alongside power procurement, cooling design, and site selection, as the industry enters a new phase of capital intensity and operational complexity.
