Politicians have unanimously approved plans to strengthen the island's Emergency Powers Law.
The changes give a government Emergencies Council, chaired by the Chief Minister, the right to order a curfew, disconnect utilities and even ration food, fuel and medicine if needed.
External Relations Minister Senator Ian Gorst says preparing for the UK's withdrawal from the EU exposed the need the update the rules.
The legislation allows for restrictions on the issuing of prescription drugs.
Concerns have been raised about disruption to supplies of food and medicines, particularly in the event of a no-deal Brexit.
The Emergencies Council will also now be considered to have enough members to make a decision if at least half are present at a meeting.
The Boat Show is back at St Helier Marina
'Partnership Leads' appointed of new school grouping system
Businesses to get more money towards cost of training staff
Andium marks record year for new homes in Jersey
Princess Anne opens Jersey Zoo gorilla enclosure
Tarifa Jet and Caesarea Trader return to service
Jersey Post returns to profit
Could harnessing the youth vote change the election?
