About MOSL


From April 2017 non-household water customers in England will be able to choose their retailer for the first time. It’s called the ‘Open Water’ programme – and we’re at the heart of making it happen.

The introduction of competition aims to drive down prices and improve customer service, whether you’re the smallest charity or the largest corporation.

Having one water retailer also means companies can opt to have just one water bill if they wish – instead of dozens or even hundreds of individual bills they receive currently.

MOSL’s role

The Open Water programme is led by the Department for Food, the Environment and Rural Affairs (Defra), and the water industry regulator, Ofwat. We’re working closely with Defra and Ofwat to:

  • Deliver the core IT systems that will enable registration, customer switching and settlement between wholesalers and retailers, and
  • Offer our water company members support and advice on their business readiness activities as we approach the opening of the new market.

More detail about our role and plans for 2015/16 can be found in the MOSL business plan.

About this site

In addition to general information about MOSL, this site aims to be an up-to-date and comprehensive resource for existing water companies and would-be market entrants.

You will find MOSL news, documents, meetings, presentations and so on, as well as links to relevant updates posted on the Open Water, Defra and Ofwat websites. Apart from the forum and members-only documents, which require registration, all documents are available to the public.

If you wish to receive updates from MOSL, please join our mailing lists or follow us on Twitter. If you have any comments or feedback about this site, please don’t hesitate to get in touch or follow the links below for more information.

Quick links

Open Water logo           Ofwat logo

Upcoming eventsSee all

Open Water Update Calls
Event date: 27/10/2016 | Event time: 09:30 - 10:30 | Location: Teleconference
Interim Codes Panel Meeting
Event date: 08/11/2016 | Event time: 10:30 - 15:30 | Location: Ofwat
Open Water Update Calls
Event date: 10/11/2016 | Event time: 09:30 - 10:30 | Location: Teleconference
Operations and Release Working Group
Event date: 15/11/2016 | Event time: 10:00-16:00 | Location: CGI offices, London
Workplan Review Group Meeting
Event date: 22/11/2016 | Event time: 10:00 - 16:00 | Location: Grand Connaught Rooms, London
Open Water Update Calls
Event date: 24/11/2016 | Event time: 09:30 - 10:30 | Location: Teleconference