The group have created a joint video to promote the Priority Services Register, a service that all utilities provide for people needing extra support for a variety of reasons.
The companies involved are all members of the Utility Networks Partnership and are already working closely together to help customers living in vulnerable circumstances.
They are Affinity Water, Anglian Water, Northumbrian Water, Essex and Suffolk Water, SES Water, SGN, South East Water, Southern Water, Thames Water, UK Power Networks Cadent Gas and Cambridge Water.
Andrew Kindness, Customer Service Manager, Northumbrian Water Group said: "Taking care of our customers is at the heart of everything we do.
"That's why across the utility sector we have come together to make the Priority Services Register even easier to use, giving our customers extra support when they need it most. It's completely free of charge and it's simple to sign up."
Kerry Potter, UK Power Networks' consumer vulnerability manager, who chairs the Utility Networks Partnership, said: "It's fantastic to work as a team to create a new video promoting the Priority Services Register which is making it easier for eligible people to get support. When utility companies share a consistent message, we can help far more people.
"Collaboration is key to tackling vulnerability and our utility networks group works together to provide consistent services for vulnerable customers in the regions we serve."
Thirty-five charity partners have helped develop the video to increase awareness about the free help available from utilities in the event of a gas, water or electricity outage.
The Priority Services Register is available to customers who:
Customers are being encouraged to register now to make sure that, in the event of an unexpected emergency, they can benefit from free services from their utilities, such as providing tailored support like alternative cooking facilities, hot meals or bottled water.
Andrew added: "The information can be given in different ways including over the phone. We even have a password scheme to protect customers from scammers or permission can be given to deal with someone else such as a family member or carer.
"We are all helping to give our customers a little extra support and peace of mind, keeping those lifelines flowing, whatever the circumstances, whatever the weather."