BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//HeatReturn//Ofgem heat network deadlines//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Ofgem heat network deadlines (HeatReturn)
X-WR-CALDESC:Submission windows and the registration deadline from Ofgem's regular data reporting guidance (10 March 2026). HeatReturn is independent of Ofgem.
BEGIN:VEVENT
UID:registration-deadline@heatreturn.co.uk
DTSTAMP:20260916T000000Z
DTSTART;VALUE=DATE:20270126
DTEND;VALUE=DATE:20270127
SUMMARY:Ofgem heat network registration deadline (26 January 2027)
DESCRIPTION:Existing heat networks must be registered on Ofgem's Heat Net
 works Digital Service by this date. Every network has to be registered (a
 n estate can combine its blocks into one registration). Source: Ofgem reg
 ular data reporting guidance\, 10 March 2026\, para 2.14. https://heatret
 urn.co.uk/deadlines
URL:https://heatreturn.co.uk/deadlines
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER:-P14D
DESCRIPTION:Ofgem heat network registration deadline (26 January 2027)
END:VALARM
END:VEVENT
BEGIN:VEVENT
UID:window-2026-Q1@heatreturn.co.uk
DTSTAMP:20260916T000000Z
DTSTART;VALUE=DATE:20260701
DTEND;VALUE=DATE:20260801
SUMMARY:Ofgem heat network submission window: Q1 (1 July 2026 – 31 July 2
 026)
DESCRIPTION:Submit the Q1 (1 April 2026 – 30 June 2026) return on Ofgem's
  digital service between 1 July 2026 and 31 July 2026. An extension to 31
  August 2026 can be requested (para 2.5). Window dates are Ofgem's guidan
 ce (Tables 1 and 2); whether the digital service is ready for a given win
 dow is only expected. https://heatreturn.co.uk/deadlines
URL:https://heatreturn.co.uk/deadlines
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER:-P7D
DESCRIPTION:Ofgem heat network submission window: Q1 (1 July 2026 – 31 Ju
 ly 2026)
END:VALARM
END:VEVENT
BEGIN:VEVENT
UID:window-2026-Q2@heatreturn.co.uk
DTSTAMP:20260916T000000Z
DTSTART;VALUE=DATE:20261001
DTEND;VALUE=DATE:20261101
SUMMARY:Ofgem heat network submission window: Q2 (1 October 2026 – 31 Oct
 ober 2026)
DESCRIPTION:Submit the Q2 (1 July 2026 – 30 September 2026) return on Ofg
 em's digital service between 1 October 2026 and 31 October 2026. An exten
 sion to 30 November 2026 can be requested (para 2.5). Window dates are Of
 gem's guidance (Tables 1 and 2); whether the digital service is ready for
  a given window is only expected. https://heatreturn.co.uk/deadlines
URL:https://heatreturn.co.uk/deadlines
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER:-P7D
DESCRIPTION:Ofgem heat network submission window: Q2 (1 October 2026 – 31
  October 2026)
END:VALARM
END:VEVENT
BEGIN:VEVENT
UID:window-2026-Q3@heatreturn.co.uk
DTSTAMP:20260916T000000Z
DTSTART;VALUE=DATE:20270101
DTEND;VALUE=DATE:20270201
SUMMARY:Ofgem heat network submission window: Q3 (1 January 2027 – 31 Jan
 uary 2027)
DESCRIPTION:Submit the Q3 (1 October 2026 – 31 December 2026) return on O
 fgem's digital service between 1 January 2027 and 31 January 2027. An ext
 ension to 28 February 2027 can be requested (para 2.5). Window dates are 
 Ofgem's guidance (Tables 1 and 2); whether the digital service is ready f
 or a given window is only expected. https://heatreturn.co.uk/deadlines
URL:https://heatreturn.co.uk/deadlines
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER:-P7D
DESCRIPTION:Ofgem heat network submission window: Q3 (1 January 2027 – 31
  January 2027)
END:VALARM
END:VEVENT
BEGIN:VEVENT
UID:window-2026-Q4@heatreturn.co.uk
DTSTAMP:20260916T000000Z
DTSTART;VALUE=DATE:20270401
DTEND;VALUE=DATE:20270501
SUMMARY:Ofgem heat network submission window: Q4 + annual (1 April 2027 –
  30 April 2027)
DESCRIPTION:Submit the Q4 (1 January 2027 – 31 March 2027) return and the
  annual return on Ofgem's digital service between 1 April 2027 and 30 Apr
 il 2027. An extension to 31 May 2027 can be requested (para 2.5). Window 
 dates are Ofgem's guidance (Tables 1 and 2); whether the digital service 
 is ready for a given window is only expected. https://heatreturn.co.uk/de
 adlines
URL:https://heatreturn.co.uk/deadlines
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER:-P7D
DESCRIPTION:Ofgem heat network submission window: Q4 + annual (1 April 20
 27 – 30 April 2027)
END:VALARM
END:VEVENT
BEGIN:VEVENT
UID:window-2027-Q1@heatreturn.co.uk
DTSTAMP:20260916T000000Z
DTSTART;VALUE=DATE:20270701
DTEND;VALUE=DATE:20270801
SUMMARY:Ofgem heat network submission window: Q1 (1 July 2027 – 31 July 2
 027)
DESCRIPTION:Submit the Q1 (1 April 2027 – 30 June 2027) return on Ofgem's
  digital service between 1 July 2027 and 31 July 2027. An extension to 31
  August 2027 can be requested (para 2.5). Window dates are Ofgem's guidan
 ce (Tables 1 and 2); whether the digital service is ready for a given win
 dow is only expected. https://heatreturn.co.uk/deadlines
URL:https://heatreturn.co.uk/deadlines
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER:-P7D
DESCRIPTION:Ofgem heat network submission window: Q1 (1 July 2027 – 31 Ju
 ly 2027)
END:VALARM
END:VEVENT
BEGIN:VEVENT
UID:window-2027-Q2@heatreturn.co.uk
DTSTAMP:20260916T000000Z
DTSTART;VALUE=DATE:20271001
DTEND;VALUE=DATE:20271101
SUMMARY:Ofgem heat network submission window: Q2 (1 October 2027 – 31 Oct
 ober 2027)
DESCRIPTION:Submit the Q2 (1 July 2027 – 30 September 2027) return on Ofg
 em's digital service between 1 October 2027 and 31 October 2027. An exten
 sion to 30 November 2027 can be requested (para 2.5). Window dates are Of
 gem's guidance (Tables 1 and 2); whether the digital service is ready for
  a given window is only expected. https://heatreturn.co.uk/deadlines
URL:https://heatreturn.co.uk/deadlines
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER:-P7D
DESCRIPTION:Ofgem heat network submission window: Q2 (1 October 2027 – 31
  October 2027)
END:VALARM
END:VEVENT
BEGIN:VEVENT
UID:window-2027-Q3@heatreturn.co.uk
DTSTAMP:20260916T000000Z
DTSTART;VALUE=DATE:20280101
DTEND;VALUE=DATE:20280201
SUMMARY:Ofgem heat network submission window: Q3 (1 January 2028 – 31 Jan
 uary 2028)
DESCRIPTION:Submit the Q3 (1 October 2027 – 31 December 2027) return on O
 fgem's digital service between 1 January 2028 and 31 January 2028. An ext
 ension to 29 February 2028 can be requested (para 2.5). Window dates are 
 Ofgem's guidance (Tables 1 and 2); whether the digital service is ready f
 or a given window is only expected. https://heatreturn.co.uk/deadlines
URL:https://heatreturn.co.uk/deadlines
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER:-P7D
DESCRIPTION:Ofgem heat network submission window: Q3 (1 January 2028 – 31
  January 2028)
END:VALARM
END:VEVENT
BEGIN:VEVENT
UID:window-2027-Q4@heatreturn.co.uk
DTSTAMP:20260916T000000Z
DTSTART;VALUE=DATE:20280401
DTEND;VALUE=DATE:20280501
SUMMARY:Ofgem heat network submission window: Q4 + annual (1 April 2028 –
  30 April 2028)
DESCRIPTION:Submit the Q4 (1 January 2028 – 31 March 2028) return and the
  annual return on Ofgem's digital service between 1 April 2028 and 30 Apr
 il 2028. An extension to 31 May 2028 can be requested (para 2.5). Window 
 dates are Ofgem's guidance (Tables 1 and 2); whether the digital service 
 is ready for a given window is only expected. https://heatreturn.co.uk/de
 adlines
URL:https://heatreturn.co.uk/deadlines
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER:-P7D
DESCRIPTION:Ofgem heat network submission window: Q4 + annual (1 April 20
 28 – 30 April 2028)
END:VALARM
END:VEVENT
END:VCALENDAR