Official NESO/Elexon system warning notices (e.g. Electricity Margin Notices, Capacity Market Notices, operational alerts). Not every notice indicates a consumer facing issue. see what these notice types mean.
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 386.75; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 403.41; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 386.75; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 366.15; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that there will be a planned outage impacting all WA API connected BMUs to the Balancing Mechanism from 10:00 to 15:00 on 10/11/2026.
Please note: this change does not impact Market Participants that have dedicated communication lines into the Balancing Mechanism. The Balancing Mechanism will be available throughout this outage for those Control Room users.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
All Trading Points should notify their Control Points of this WA API outage to ensure that they are prepared to take telephone instructions or submit dynamic data changes to the ENCC.
WA API Services Impacted during the Outage:
o NESO_Health
o NESO_Normalization
o NESO_Instruction
o NESO_Redeclaration
o NESO_Submission
Issued by PSM at 11:00 on 03/11/2026
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.45; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 376.31; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.45; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 364.66; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 389.18; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 364.66; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 353.00; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 351.77; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 353.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 351.30; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 353.15; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 351.30; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 358.81; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 374.72; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 358.81; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 423.43; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 460.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 423.43; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 371.09; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 403.15; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 371.09; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that the planned WA API outage was completed at 14:00 on 26/10/2026.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
Issued by Power System Engineer at 14:30 on 26/10/2026
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that there will be a planned outage impacting all WA API connected BMUs to the Balancing Mechanism from 11:00 to 16:00 on 26/10/2026.
Please note: this change does not impact Market Participants that have dedicated communication lines into the Balancing Mechanism. The Balancing Mechanism will be available throughout this outage for those Control Room users.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
All Trading Points should notify their Control Points of this WA API outage to ensure that they are prepared to take telephone instructions or submit dynamic data changes to the ENCC.
WA API Services Impacted during the Outage:
o NESO_Health
o NESO_Normalization
o NESO_Instruction
o NESO_Redeclaration
o NESO_Submission
Issued by Peter Michael Chandler at 08:50 on 26/10/2026
From : Power System Manager, National Energy System Operator
Notification of NESO Cancellation of Emergency Instruction to a BM Participant
National Energy System Operator has cancelled the Emergency Instruction to CMSTW-1 at 26/10/2026/05:00
From : Power System Manager – NESO Electricity Control Centre.
NATIONAL ELECTRICITY TRANSMISSION SYSTEM WARNING:
Inadequate Localised Negative Reserve Active Power Margin.
In accordance with Grid Code BC1.5.5, National Energy System Operator hereby gives notification of Inadequate Localised Negative Reserve Active Power Margin (NRAPM) in the following regions:
BEAULY to DOUNREAY region (Scotland)
.
This Inadequate Localised NRAPM is valid for the period from 23:00 hrs on 24/10/2026
to 05:00 hrs on 26/10/2026.
The margin by which the anticipated active power output of generation connected to the transmission network in the region(s) highlighted above (or to distribution networks so connected) can be reduced in respect of the declared inflexibility of such generating plant is considered to be insufficient for the specified period.
The Bid Volume Shortfall is 100 MW.
Would all Generators, in respect of Power Stations connected to the transmission network in the region(s) highlighted above (or to distribution networks so connected), please revisit Balancing Mechanism submissions to ensure that any implied inflexibility is accurate and in line with intended operating plans during these times.
Should the forecast conditions continue to exist then National Energy System Operator may be forced to invoke the provisions of Grid Code BC2 with regard to the desynchronising of inflexible plant.
The situation will be reviewed again by National Energy System Operator at 05:00 on 26/10/2026 and an update issued.
Notification Issued at 21:54 hrs on 25/10/2026
Issued by PSM NESO Electricity Control Centre.
Note: This warning will remain in force for the specified period until updated or cancelled by National Energy System Operator
From: Power System Manager – NESO Electricity Control Centre
Notification of National Energy System Operator Emergency Instruction to a BM Participant
National Energy System Operator has issued an Emergency Instruction to CMSTW-1 on 25/10/2026 20:02
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that there will be a planned outage impacting all WA API connected BMUs to the Balancing Mechanism from 11:00 to 16:00 on 26/10/2026.
Please note: this change does not impact Market Participants that have dedicated communication lines into the Balancing Mechanism. The Balancing Mechanism will be available throughout this outage for those Control Room users.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
All Trading Points should notify their Control Points of this WA API outage to ensure that they are prepared to take telephone instructions or submit dynamic data changes to the ENCC.
WA API Services Impacted during the Outage:
o NESO_Health
o NESO_Normalization
o NESO_Instruction
o NESO_Redeclaration
o NESO_Submission
Issued by Power System Manager at 15:30 on 25/10/2026
From : Power System Manager – NESO Electricity Control Centre.
NATIONAL ELECTRICITY TRANSMISSION SYSTEM WARNING:
Inadequate Localised Negative Reserve Active Power Margin.
In accordance with Grid Code BC1.5.5, National Energy System Operator hereby gives notification of Inadequate Localised Negative Reserve Active Power Margin (NRAPM) in the following regions:
Beauly Region (Scotland)
.
This Inadequate Localised NRAPM is valid for the period from 23:00 hrs on 24/10/2026
to 21:00 hrs on 25/10/2026.
The margin by which the anticipated active power output of generation connected to the transmission network in the region(s) highlighted above (or to distribution networks so connected) can be reduced in respect of the declared inflexibility of such generating plant is considered to be insufficient for the specified period.
The Bid Volume Shortfall is 70 MW.
Would all Generators, in respect of Power Stations connected to the transmission network in the region(s) highlighted above (or to distribution networks so connected), please revisit Balancing Mechanism submissions to ensure that any implied inflexibility is accurate and in line with intended operating plans during these times.
Should the forecast conditions continue to exist then National Energy System Operator may be forced to invoke the provisions of Grid Code BC2 with regard to the desynchronising of inflexible plant.
The situation will be reviewed again by National Energy System Operator at 21:00 on 25/10/2026 and an update issued.
Notification Issued at 15:00 hrs on 25/10/2026
Issued by Power System Manager NESO Electricity Control Centre.
Note: This warning will remain in force for the specified period until updated or cancelled by National Energy System Operator
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid -2.45 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid -2.45 From NESO: Offer 1168.68; Bid -210.36
From : Power System Manager – NESO Electricity Control Centre.
NATIONAL ELECTRICITY TRANSMISSION SYSTEM WARNING:
Inadequate Localised Negative Reserve Active Power Margin.
In accordance with Grid Code BC1.5.5, National Energy System Operator hereby gives notification of Inadequate Localised Negative Reserve Active Power Margin (NRAPM) in the following regions:
Beauly Region (Scotland)
.
This Inadequate Localised NRAPM is valid for the period from 23:00 hrs on 24/10/2026
to 21:00 hrs on 25/10/2026.
The margin by which the anticipated active power output of generation connected to the transmission network in the region(s) highlighted above (or to distribution networks so connected) can be reduced in respect of the declared inflexibility of such generating plant is considered to be insufficient for the specified period.
The Bid Volume Shortfall is 70 MW.
Would all Generators, in respect of Power Stations connected to the transmission network in the region(s) highlighted above (or to distribution networks so connected), please revisit Balancing Mechanism submissions to ensure that any implied inflexibility is accurate and in line with intended operating plans during these times.
Should the forecast conditions continue to exist then National Energy System Operator may be forced to invoke the provisions of Grid Code BC2 with regard to the desynchronising of inflexible plant.
The situation will be reviewed again by National Energy System Operator at 15:00 on 25/10/2026 and an update issued.
Notification Issued at 09:00 hrs on 25/10/2026
Issued by Power System Manager NESO Electricity Control Centre.
Note: This warning will remain in force for the specified period until updated or cancelled by National Energy System Operator
A request for Emergency Assistance has been agreed on a GB connected Interconnector.
The requesting party was External TSO. GB net flow will decrease by 477 MW between 04:10 25/10/2026 to 09:00 25/10/2026.
Issued by PSM at 04:46 on 25/10/2026
From : Power System Manager – NESO Electricity Control Centre.
NATIONAL ELECTRICITY TRANSMISSION SYSTEM WARNING:
Inadequate Localised Negative Reserve Active Power Margin.
In accordance with Grid Code BC1.5.5, National Energy System Operator hereby gives notification of Inadequate Localised Negative Reserve Active Power Margin (NRAPM) in the following regions:
Beauly region (Scotland)
.
This Inadequate Localised NRAPM is valid for the period from 23:00 hrs on 24/10/2026
to 21:00 hrs on 25/10/2026.
The margin by which the anticipated active power output of generation connected to the transmission network in the region(s) highlighted above (or to distribution networks so connected) can be reduced in respect of the declared inflexibility of such generating plant is considered to be insufficient for the specified period.
The Bid Volume Shortfall is 70 MW.
Would all Generators, in respect of Power Stations connected to the transmission network in the region(s) highlighted above (or to distribution networks so connected), please revisit Balancing Mechanism submissions to ensure that any implied inflexibility is accurate and in line with intended operating plans during these times.
Should the forecast conditions continue to exist then National Energy System Operator may be forced to invoke the provisions of Grid Code BC2 with regard to the desynchronising of inflexible plant.
The situation will be reviewed again by National Energy System Operator at 09:00 on 25/10/2026 and an update issued.
Notification Issued at 23:15 hrs on 24/10/2026
Issued by PSM NESO Electricity Control Centre.
Note: This warning will remain in force for the specified period until updated or cancelled by National Energy System Operator
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid -8.56 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid -14.74 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid -8.56 From NESO: Offer 1168.68; Bid -210.36
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that the planned WA API outage was completed at 11:19 on 23/10/2026.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
Issued by Power System Manager at 11:45 on 23/10/2026
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that there will be a planned outage impacting all WA API connected BMUs to the Balancing Mechanism from 08:00 to 13:00 on 23/10/2026.
Please note: this change does not impact Market Participants that have dedicated communication lines into the Balancing Mechanism. The Balancing Mechanism will be available throughout this outage for those Control Room users.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
All Trading Points should notify their Control Points of this WA API outage to ensure that they are prepared to take telephone instructions or submit dynamic data changes to the ENCC.
WA API Services Impacted during the Outage:
o NESO_Health
o NESO_Normalization
o NESO_Instruction
o NESO_Redeclaration
o NESO_Submission
Issued by Power System Manager at 07:25 on 23/10/2026
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that there will be a planned outage impacting all WA API connected BMUs to the Balancing Mechanism from 08:00 to 13:00 on 23/10/2026.
Please note: this change does not impact Market Participants that have dedicated communication lines into the Balancing Mechanism. The Balancing Mechanism will be available throughout this outage for those Control Room users.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
All Trading Points should notify their Control Points of this WA API outage to ensure that they are prepared to take telephone instructions or submit dynamic data changes to the ENCC.
WA API Services Impacted during the Outage:
o NESO_Health
o NESO_Normalization
o NESO_Instruction
o NESO_Redeclaration
o NESO_Submission
Issued by Power System Manager at 16:45 on 22/10/2026
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid -33.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid -32.34 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid -33.00 From NESO: Offer 1168.68; Bid -210.36
From: Power System Manager – NESO Electricity Control Centre
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION - BALANCING MECHANISM IT SYSTEMS PLANNED OUTAGE
To All Balancing Mechanism (BM) System Users
Please be advised that the planned BM outage (with NO server changeover) was successfully completed today 22/10/2026 at 13:20.
Contact: 0800 917 7111 or 0800 085 4806
Overseas contact: +44 870 521 6121 quoting NETA EDT
Issued at 13:30 hours on 22/10/2026.
Issued by PSM NESO Electricity National Control Centre.
From: Power System Manager – NESO Electricity Control Centre
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION - BALANCING MECHANISM IT SYSTEMS PLANNED OUTAGE
To All Balancing Mechanism (BM) System Users
As previously advised, the planned BM outage will start today 22/10/2026 at 10:10 until 15:10. This will affect EDT, EDL and BSAD and will NOT incur a server changeover.
All Trading Points must notify their Control Points (CP) of the outage and ensure they are prepared to take telephone instructions or submit dynamic data changes by telephone to the ENCC.
NOTE: from the start of the outage CPs should not use EDL until they receive notification of completion of the outage. Any EDL re-declarations will be rejected with an error message (R999). Similarly, when the systems are returning, the EDL link may appear available but will not be.
Further updates will be via BMRS.
Contact: 0800 917 7111 or 0800 085 4806
Overseas contact: +44 870 521 6121 quoting NETA EDT
Issued at 09:30 hours on 22/10/2026.
Issued by PSM NESO Electricity National Control Centre.
From: Power System Manager – NESO Electricity Control Centre
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION - BALANCING MECHANISM IT SYSTEMS PLANNED OUTAGE
To All Balancing Mechanism (BM) System Users
There will be a planned BM outage from 10:10 to 15:10 on 22/10/2026 which will affect EDT, EDL and BSAD communications and will NOT incur a server changeover.
All Trading Points must notify their Control Points (CP) of the outage and ensure they are prepared to take telephone instructions or submit dynamic data changes by telephone to the ENCC.
NOTE: from the start of the outage CPs should not use EDL until they receive notification of completion of the outage. Any EDL re-declarations will be rejected with an error message (R999). Similarly, when the systems are returning, the EDL link may appear available but will not be.
Further updates will be via BMRS and the outage will be confirmed with users via BMRS just before the start.
Contact: 0800 917 7111 or 0800 085 4806
Overseas contact: +44 870 521 6121 quoting NETA EDT
Issued at 15:30 hours on 21/10/2026.
Issued by Power System Manager NESO Electricity National Control Centre.
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that there will be a planned outage impacting all WA API connected BMUs to the Balancing Mechanism from 10:10 to 15:10 on 26/10/2026.
Please note: this change does not impact Market Participants that have dedicated communication lines into the Balancing Mechanism. The Balancing Mechanism will be available throughout this outage for those Control Room users.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
All Trading Points should notify their Control Points of this WA API outage to ensure that they are prepared to take telephone instructions or submit dynamic data changes to the ENCC.
WA API Services Impacted during the Outage:
o NESO_Health
o NESO_Normalization
o NESO_Instruction
o NESO_Redeclaration
o NESO_Submission
Issued by Pat Stewart at 17:30 on 20/10/2026
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that there will be a planned outage impacting all WA API connected BMUs to the Balancing Mechanism from 10:00 to 15:00 on 23/10/2026.
Please note: this change does not impact Market Participants that have dedicated communication lines into the Balancing Mechanism. The Balancing Mechanism will be available throughout this outage for those Control Room users.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
All Trading Points should notify their Control Points of this WA API outage to ensure that they are prepared to take telephone instructions or submit dynamic data changes to the ENCC.
WA API Services Impacted during the Outage:
o NESO_Health
o NESO_Normalization
o NESO_Instruction
o NESO_Redeclaration
o NESO_Submission
Issued by Pat Stewart at 17:15 on 20/10/2026
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid -32.70 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that the planned WA API outage was completed at 16:00 on 19/10/2026.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
Issued by Peter Michael Chandler at 16:35 on 19/10/2026
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that there will be a planned outage impacting all WA API connected BMUs to the Balancing Mechanism from 12:00 to 17:30 on 19/10/2026.
Please note: this change does not impact Market Participants that have dedicated communication lines into the Balancing Mechanism. The Balancing Mechanism will be available throughout this outage for those Control Room users.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
All Trading Points should notify their Control Points of this WA API outage to ensure that they are prepared to take telephone instructions or submit dynamic data changes to the ENCC.
WA API Services Impacted during the Outage:
o NESO_Health
o NESO_Normalization
o NESO_Instruction
o NESO_Redeclaration
o NESO_Submission
Issued by Power System Manager at 09:55 on 19/10/2026
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
From: Power System Manager – NESO Electricity Control Centre
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION - BALANCING MECHANISM IT SYSTEMS PLANNED OUTAGE
To All Balancing Mechanism (BM) System Users
There will be a planned BM outage from 10:10 to 15:10 on 22/10/2026 which will affect EDT, EDL and BSAD communications and will NOT incur a server changeover.
All Trading Points must notify their Control Points (CP) of the outage and ensure they are prepared to take telephone instructions or submit dynamic data changes by telephone to the ENCC.
NOTE: from the start of the outage CPs should not use EDL until they receive notification of completion of the outage. Any EDL re-declarations will be rejected with an error message (R999). Similarly, when the systems are returning, the EDL link may appear available but will not be.
Further updates will be via BMRS and the outage will be confirmed with users via BMRS just before the start.
Contact: 0800 917 7111 or 0800 085 4806
Overseas contact: +44 870 521 6121 quoting NETA EDT
Issued at 20:15 hours on 16/10/2026.
Issued by Power System Manager NESO Electricity National Control Centre.
NATIONAL ENERGY SYSTEM OPERATOR NOTIFICATION of excess energy prices used for settlement outside of BALIT for SO to SO Transactions
over the National Grid/RTE Interconnector.
Prices cover 23:00Hrs Today to 05:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 701.21; Bid -210.36
Prices cover 05:00Hrs Tomorrow to 19:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid -29.00 From NESO: Offer 1168.68; Bid -210.36
Prices cover 19:00Hrs Tomorrow to 23:00Hrs Tomorrow (UK local time) and are in Euro/MWh.
From RTE: Offer 350.00; Bid 0.00 From NESO: Offer 1168.68; Bid -210.36
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that the planned WA API outage was completed at 02:00 on 16/10/2026.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
Issued by PSM at 02:11 on 16/10/2026
To All Balancing Mechanism Wider Access API EDL and EDT Users
Please be advised that there will be a planned outage impacting all WA API connected BMUs to the Balancing Mechanism from 22:00 to 02:00 on 15/10/2026.
Please note: this change does not impact Market Participants that have dedicated communication lines into the Balancing Mechanism. The Balancing Mechanism will be available throughout this outage for those Control Room users.
For any technical issues or incidents, please phone 0800 917 7111 or 0800 085 4806. Overseas callers should use +44 870 521 6121 and quote WA-API.
All Trading Points should notify their Control Points of this WA API outage to ensure that they are prepared to take telephone instructions or submit dynamic data changes to the ENCC.
WA API Services Impacted during the Outage:
o NESO_Health
o NESO_Normalization
o NESO_Instruction
o NESO_Redeclaration
o NESO_Submission
Issued by Power System Manager at 16:20 on 15/10/2026