Home

Join our mailing list

Make sure you are receiving the most relevant and up-to-date communications from MOSL by signing up to our brand-new mailing list. Click here to subscribe.

news

COVID-19 responses

We are publishing regular updates and actions taken in response to the COVID-19 pandemic on our dedicated News & Views page.

Market Codes

learn more

The latest version of the market codes, the change process and consultations on changes.

Panel & Committees

learn more

What the Panel does and meeting details, member biogs and panel committees

CMOS

learn more

Everything to do with the core IT system that underpins MOSL’s role within the new water market

Market Performance

learn more

Key charts and information outlining market performance including switching and settlement

FORTHCOMING EVENTS

06Apr

Mar 2020 Settlement R1 Invoice Period

06Apr

Jan 2020 Settlement R2 Invoice Period

06Apr

Jul 2019 Settlement R3 Invoice Period

06Apr

Nov 2018 Settlement RF Invoice Period

07Apr

May 2020 Settlement P1 Invoice Period

08Apr

OPS submission deadline

15Apr

Trading Disputes Committee

15Apr

MPS and OPS charts updated

15Apr

MPS Reports, Market Charts and Market Focus Published

15Apr

MPC Agenda published

16Apr

MPS and OPS reports published and OPS data refreshed

16Apr

User Forum

17Apr

CMOS Release 8.0 deployed in MPS2 – 10am to 8am (next day)

20Apr

CMOS Planned Maintenance MPS/MPS2 – 10am to 4pm

21Apr

ORWG - April

21Apr

CMOS Planned Maintenance MPS/MPS2 – 10am to 4pm

22Apr

CMOS Planned Maintenance MPS/MPS2 if required – 10am to 4pm

22Apr

MPC Papers published (non-confidential)

25Apr

CMOS Planned Maintenance PROD – 11pm to 6am (next day)

27Apr

Panel Meeting 41a

28Apr

Panel Meeting 42

29Apr

MPC Meeting 37

04May

CMOS Release 8.0 Patch Drop in MPS2 – 10am to 5pm

07May

Apr 2020 Settlement R1 Invoice Period

07May

Feb 2020 Settlement R2 Invoice Period

07May

Aug 2019 Settlement R3 Invoice Period

07May

Dec 2018 Settlement RF Invoice Period

07May

Jun 2020 Settlement P1 Invoice Period

11May

OPS submission deadline

12May

MPC agenda published

14May

MPS and OPS charts updated

15May

MPS and OPS reports published and OPS data refreshed

15May

CMOS Release 8.0 deployed in PROD – 6pm-2pm (next day)

19May

MPC papers published (non-confidential)

19May

CMOS Release 8.0 deployed in MPS – 10am to 5pm

20May

Trading Disputes Committee

26May

Panel Meeting 43

27May

MPC Meeting 38

04Jun

May 2020 Settlement R1 Invoice Period

04Jun

Mar 2020 Settlement R2 Invoice Period

04Jun

Sep 2019 Settlement R3 Invoice Period

04Jun

Jan 2019 Settlement RF Invoice Period

07Jun

Jun 2020 Settlement R1 Invoice Period

08Jun

Jul 2020 Settlement R1 Invoice Period

08Jun

OPS submission deadline

09Jun

Jul 2020 Settlement P1 Invoice Period

10Jun

MPC agenda published

11Jun

MPS and OPS charts updated

12Jun

MPS and OPS reports published and OPS data refreshed

16Jun

ORWG - June

17Jun

MPC papers published (non-confidential)

18Jun

User Forum

24Jun

Trading Disputes Committee

24Jun

MPC Meeting 39

30Jun

Panel Meeting 44

06Jul

Apr 2020 Settlement R2 Invoice Period

06Jul

Oct 2019 Settlement R3 Invoice Period

06Jul

Feb 2019 Settlement RF Invoice Period

08Jul

OPS submission deadline

10Jul

Aug 2020 Settlement P1 Invoice Period

13Jul

MPS and OPS charts updated

14Jul

MPS and OPS reports published and OPS data refreshed

15Jul

MPC agenda published

15Jul

Trading Disputes Committee

20Jul

CMOS Planned Maintenance MPS/MPS2 – 10am to 4pm

21Jul

CMOS Planned Maintenance MPS/MPS2 – 10am to 4pm

21Jul

Panel Meeting 45

22Jul

MPC papers published (non-confidential)

22Jul

CMOS Planned Maintenance MPS/MPS2 if required – 10am to 4pm

29Jul

MPC Meeting 40

06Aug

May 2020 Settlement R2 Invoice Period

06Aug

Nov 2019 Settlement R3 Invoice Period

06Aug

Mar 2019 Settlement RF Invoice Period

07Aug

Sep 2020 Settlement P1 Invoice Period

10Aug

OPS submission deadline

12Aug

MPC agenda published

13Aug

MPS and OPS charts updated

14Aug

MPS and OPS reports published and OPS data refreshed

14Aug

CMOS Release 8.5 Patch Drop in MPS2 – 10am to 5pm

15Aug

CMOS Planned Maintenance PROD – 11pm to 6am (next day)

19Aug

Trading Disputes Committee

19Aug

MPC papers published (non-confidential)

25Aug

Panel Meeting 46

26Aug

MPC Meeting 41

28Aug

CMOS Release 8.5 deployed in PROD – 6pm-2pm (next day)

02Sep

CMOS Release 8.5 deployed in MPS – 10am to 5pm

04Sep

Aug 2020 Settlement R1 Invoice Period

04Sep

Jun 2020 Settlement R2 Invoice Period

04Sep

Dec 2019 Settlement R3 Invoice Period

04Sep

Apr 2019 Settlement RF Invoice Period

08Sep

OPS submission deadline

09Sep

Oct 2020 Settlement P1 Invoice Period

11Sep

MPS and OPS charts updated

14Sep

MPS and OPS reports published and OPS data refreshed

16Sep

MPC agenda published

17Sep

User Forum

23Sep

Trading Disputes Committee

23Sep

MPC papers published (non-confidential)

29Sep

Panel Meeting 47

30Sep

MPC Meeting 42

02Oct

CMOS Release 9.0 deployed in MPS2 – 10am to 8am (next day)

06Oct

Sep 2020 Settlement R1 Invoice Period

06Oct

Jul 2020 Settlement R2 Invoice Period

06Oct

Jan 2020 Settlement R3 Invoice Period

06Oct

May 2019 Settlement RF Invoice Period

08Oct

OPS submission deadline

09Oct

Nov 2020 Settlement P1 Invoice Period

13Oct

MPS and OPS charts updated

14Oct

MPC agenda published

14Oct

Trading Disputes Committee

14Oct

MPS and OPS reports published and OPS data refreshed

15Oct

User Forum

16Oct

CMOS Release 9.0 Patch Drop in MPS2 – 10am to 5pm

19Oct

CMOS Planned Maintenance MPS/MPS2 – 10am to 4pm

20Oct

CMOS Planned Maintenance MPS/MPS2 – 10am to 4pm

21Oct

MPC papers published (non-confidential)

21Oct

CMOS Planned Maintenance MPS/MPS2 if required – 10am to 4pm

27Oct

Panel Meeting 48

28Oct

MPC Meeting 43

05Nov

Oct 2020 Settlement R1 Invoice Period

05Nov

Aug 2020 Settlement R2 Invoice Period

05Nov

Feb 2020 Settlement R3 Invoice Period

05Nov

Jun 2019 Settlement RF Invoice Period

06Nov

CMOS Release 9.0 deployed in PROD – 6pm-2pm (next day)

09Nov

Dec 2020 Settlement P1 Invoice Period

09Nov

OPS submission deadline

10Nov

CMOS Release 9.0 deployed in MPS – 10am to 5pm

11Nov

MPC agenda published

12Nov

MPS and OPS charts updated

13Nov

MPS and OPS reports published and OPS data refreshed

14Nov

CMOS Planned Maintenance PROD – 11pm to 6am (next day)

18Nov

MPC papers published (non-confidential)

18Nov

Trading Disputes Committee

19Nov

User Forum

23Nov

Panel Meeting 48a

24Nov

Panel Meeting 49

25Nov

MPC Meeting 44

04Dec

Nov 2020 Settlement R1 Invoice Period

04Dec

Sep 2020 Settlement R2 Invoice Period

04Dec

Mar 2020 Settlement R3 Invoice Period

04Dec

Jul 2019 Settlement RF Invoice Period

08Dec

Jan 2021 Settlement P1 Invoice Period

08Dec

OPS submission deadline

11Dec

MPS and OPS charts updated

14Dec

MPS and OPS reports published and OPS data refreshed

15Dec

Panel Meeting 50

18Dec

Trading Disputes Committee

07Jan

Dec 2020 Settlement R1 Invoice Period

07Jan

Oct 2020 Settlement R2 Invoice Period

07Jan

Apr 2020 Settlement R3 Invoice Period

07Jan

Aug 2019 Settlement RF Invoice Period

08Jan

Feb 2021 Settlement P1 Invoice Period

11Jan

OPS submission deadline

13Jan

MPC agenda published

14Jan

MPS and OPS charts updated

15Jan

MPS and OPS reports published and OPS data refreshed

18Jan

CMOS Planned Maintenance MPS/MPS2 – 10am to 4pm

19Jan

CMOS Planned Maintenance MPS/MPS2 – 10am to 4pm”

20Jan

MPC papers published (non-confidential)

20Jan

CMOS Planned Maintenance MPS/MPS2 if required – 10am to 4pm

21Jan

User Forum

27Jan

MPC Meeting 46

04Feb

Jan 2021 Settlement R1 Invoice Period

04Feb

Nov 2020 Settlement R2 Invoice Period

04Feb

May 2020 Settlement R3 Invoice Period

04Feb

Sep 2019 Settlement RF Invoice Period

05Feb

Mar 2021 Settlement P1 Invoice Period

06Feb

CMOS Planned Maintenance PROD – 11pm to 6am (next day)

08Feb

OPS submissiondeadline

10Feb

MPC agenda published

11Feb

MPS and OPS charts updated

12Feb

MPS and OPS reports published and OPS data refreshed

17Feb

MPC papers published (non-confidential)

18Feb

User Forum

24Feb

MPC Meeting 47

04Mar

Feb 2021 Settlement R1 Invoice Period

04Mar

Dec 2020 Settlement R2 Invoice Period

04Mar

Jun 2020 Settlement R3 Invoice Period

04Mar

Oct 2019 Settlement RF Invoice Period

08Mar

OPS submission deadline

10Mar

Apr 2021 Settlement P1 Invoice Period

11Mar

MPS and OPS charts updated

12Mar

MPS and OPS reports published and OPS data refreshed

17Mar

MPC agenda published

18Mar

User Forum

24Mar

MPC papers published (non-confidential)

31Mar

MPC Meeting 48

16Apr

CMOS Release 10.0 deployed in MPS2 – 10am to 8am (next day)

30Apr

CMOS Release 10.0 Patch Drop in MPS2 – 10am to 5pm

14May

CMOS Release 10.0 deployed in PROD – 6pm-2pm (next day)

18May

CMOS Release 10.0 deployed in MPS – 10am to 5pm

30Jul

CMOS Release 10.5 deployed in MPS2 – 10am to 8am (next day)

13Aug

CMOS Release 10.5 Patch Drop in MPS2 – 10am to 5pm

27Aug

CMOS Release 10.5 deployed in PROD – 6pm-2pm (next day)

31Aug

CMOS Release 10.5 deployed in MPS – 10am to 5pm

01Oct

CMOS Release 11.0 deployed in MPS2 – 10am to 8am (next day)

15Oct

CMOS Release 11.0 Patch Drop in MPS2 – 10am to 5pm

05Nov

CMOS Release 11.0 deployed in PROD – 6pm-2pm (next day)

09Nov

CMOS Release 11.0 deployed in MPS – 10am to 5pm

MOSL@mosl_

Today @Ofwat and @MOSL_ issued a joint letter to retailers to provide clarity and set out expectations of retailers… https://t.co/CS9P8rK3i3

15:06 - 3 Apr 2020

RT @thameswater: Once again, the country comes together for our heroes. Thank you for everything you are doing, from everyone at Thames Wat…

09:43 - 3 Apr 2020

RT @CCWvoice: Running a small #business can be difficult at any time, but especially difficult at present. If you find yourself in #financ…

09:42 - 3 Apr 2020

RT @IvappsT: Important to remember all the Health works who are fighting to keep us safe & well.👏👏 https://t.co/g1OmrzSMJ1

09:42 - 3 Apr 2020

RT @northumbriapol: Amazing scenes at #Cramlington hospital tonight as our officers show their support and #ClapForCarers Well done every…

09:41 - 3 Apr 2020

RT @DHSCgovuk: Life is different in many ways at the moment. If you are worried or anxious about #coronavirus, the #EveryMindMatters plat…

17:09 - 2 Apr 2020

Today @MOSL_'s Director of Market Performance, Steve Arthur joined @Ofwat to talk through the changes we have imple… https://t.co/6iRozAKfsY

16:24 - 2 Apr 2020

RT @CornwallInsight: Ofwat and MOSL have made changes to the business retail market in the wake of Covid-19. Find out more in our Water Wee…

16:15 - 2 Apr 2020

RT @TheWater_Report: Our April issue is out now. Due to Covid-19 we are giving PDF copies for print subscribers - get in touch at subs@thew…

13:28 - 2 Apr 2020

RT @WaterAidUK: #Handwashing with soap and clean water is one of the most effective ways to prevent the spread of #COVID19. 🔁 Please RETWE…

17:59 - 1 Apr 2020

This month's @MOSL_ Market Performance Committee agenda included updates on the #waterretailmarket COVID-19 respon… https://t.co/R3MhDuddZ5

17:34 - 1 Apr 2020

Thanks for the follow Elsa! For more information on MOSL visit https://t.co/ZvJht79mfP. Keep safe! Best wishes, HF

13:30 - 1 Apr 2020

Welcome. What area do you need help with?

Market Codes

Panel & Committees

CMOS

Market Performance

FORTHCOMING EVENTS

Mar 2020 Settlement R1 Invoice Period

Jan 2020 Settlement R2 Invoice Period

Jul 2019 Settlement R3 Invoice Period

Nov 2018 Settlement RF Invoice Period

May 2020 Settlement P1 Invoice Period

OPS submission deadline

Trading Disputes Committee

MPS and OPS charts updated

MPS Reports, Market Charts and Market Focus Published

MPC Agenda published

MPS and OPS reports published and OPS data refreshed

User Forum

CMOS Release 8.0 deployed in MPS2 – 10am to 8am (next day)

CMOS Planned Maintenance MPS/MPS2 – 10am to 4pm

ORWG - April

CMOS Planned Maintenance MPS/MPS2 – 10am to 4pm

CMOS Planned Maintenance MPS/MPS2 if required – 10am to 4pm

MPC Papers published (non-confidential)

CMOS Planned Maintenance PROD – 11pm to 6am (next day)

Panel Meeting 41a

Panel Meeting 42

MPC Meeting 37

CMOS Release 8.0 Patch Drop in MPS2 – 10am to 5pm

Apr 2020 Settlement R1 Invoice Period

Feb 2020 Settlement R2 Invoice Period

Aug 2019 Settlement R3 Invoice Period

Dec 2018 Settlement RF Invoice Period

Jun 2020 Settlement P1 Invoice Period

OPS submission deadline

MPC agenda published

MPS and OPS charts updated

MPS and OPS reports published and OPS data refreshed

CMOS Release 8.0 deployed in PROD – 6pm-2pm (next day)

MPC papers published (non-confidential)

CMOS Release 8.0 deployed in MPS – 10am to 5pm

Trading Disputes Committee

Panel Meeting 43

MPC Meeting 38

May 2020 Settlement R1 Invoice Period

Mar 2020 Settlement R2 Invoice Period

Sep 2019 Settlement R3 Invoice Period

Jan 2019 Settlement RF Invoice Period

Jun 2020 Settlement R1 Invoice Period

Jul 2020 Settlement R1 Invoice Period

OPS submission deadline

Jul 2020 Settlement P1 Invoice Period

MPC agenda published

MPS and OPS charts updated

MPS and OPS reports published and OPS data refreshed

ORWG - June

MPC papers published (non-confidential)

User Forum

Trading Disputes Committee

MPC Meeting 39

Panel Meeting 44

Apr 2020 Settlement R2 Invoice Period

Oct 2019 Settlement R3 Invoice Period

Feb 2019 Settlement RF Invoice Period

OPS submission deadline

Aug 2020 Settlement P1 Invoice Period

MPS and OPS charts updated

MPS and OPS reports published and OPS data refreshed

MPC agenda published

Trading Disputes Committee

CMOS Planned Maintenance MPS/MPS2 – 10am to 4pm

CMOS Planned Maintenance MPS/MPS2 – 10am to 4pm

Panel Meeting 45

MPC papers published (non-confidential)

CMOS Planned Maintenance MPS/MPS2 if required – 10am to 4pm

MPC Meeting 40

May 2020 Settlement R2 Invoice Period

Nov 2019 Settlement R3 Invoice Period

Mar 2019 Settlement RF Invoice Period

Sep 2020 Settlement P1 Invoice Period