Programme Yarrow is a British government contingency plan to deal with possible nationwide power blackouts. The plan includes scenarios where power supply is severely compromised for up to a week. The plan was originally developed in 2021 to address the possibility of a major failure of the National Grid. The plan was stress tested by government in late 2022 to deal with possible outages caused by fuel shortages as a consequence of the 2022 Russian invasion of Ukraine. Another exercise, Noble Birch, had been conducted in previous months to test the practicality of government continuity in the absence of power.
References