Recent months have seen a series of high profile power failures: the cross border outage in Spain, Portugal and France (April 2025) and the black out affecting Heathrow (March 2025) to name but two. The result for businesses disrupted by such incidents is often significant financial loss. However, without physical damage to their own property, standard business interruption cover does not respond. With grid reliability under scrutiny, and more risks affecting those grids, businesses will look to ensure that their policies include utilities and supply failure extensions to their business interruption cover as part of their resilience planning. Insurers must carefully review these extensions to ensure they only cover intended scenarios, avoiding unintended and aggregated exposures.