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Day Ahead Constraint Flows and Limits
Summary
This is a snapshot of power flow limits and actual flows across key transmission boundaries in Great Britain at the day-ahead stage. The data shows constraint boundaries with arrows indicating positive power flow direction, though flows may change after publication.
Why it matters
This data helps market participants understand transmission constraints and power flows for operational planning and trading decisions, though it's historical information that may not reflect real-time conditions.
Key facts
- •Data snapshot taken on 2019-11-05
- •Shows day-ahead stage constraint flows and limits
- •Includes network diagrams with constraint boundaries
- •Flow values represent measurement time only
Areas affected
transmissionwholesale marketgeneratorssuppliers
Related programmes
transmissionmarket_operations
Publisher description
A snapshot of the limits and flows at relevant boundaries at day ahead stage. These flow values are true for when the measurement was taken and will not reflect any changes in the flows following the publication of this data. The network diagrams show the constraint boundaries and arrows indicating the positive direction of power flow across each boundary. <br/><br/>
Full extracted text
A snapshot of the limits and flows at relevant boundaries at day ahead stage. These flow values are true for when the measurement was taken and will not reflect any changes in the flows following the publication of this data. The network diagrams show the constraint boundaries and arrows indicating the positive direction of power flow across each boundary. <br/><br/> 05/06/2025 E&W Master Picasso.v1 to Chapel Cross 132kV to Gretna/ Hawick 132kV to Moffat 400kV to Gretna 400kV 1 2 708 709 752 753 A B 65A 650 60J 60E 2 A B Q60B Q60A 1 39 1 39 F646 672 673 1 2 652 648 651 632 630 2 1 653 620 622 626 624 3 4 1 2 A B C D A B 1 2 646 603 611 2 1 654 65G 602 615 A 616 612 A 600 A B 482 19 1 19 1 2 402 1 401 342 F36A F36B 480 381 1 2 336 337 THORPE MARSH Q284 A 35A F26B F26A 1 2 346 317 360 344 R365 37C A 707 73R 73Q 741 2 1 2 1 2 1 72D 739 729 72E F727 F728 744 743 2 1 629 653 1 A 614 683 68B 638 F685 1 2 A64F 643 644 2 641 65Q 65U 659 494 655 1 2 WALPOLE NORWICH MAIN 1 2 1 2 1 2 403 420 481 442 1 492 1 39 1 39 34A 35D 35A A B 35B 35E 32F 319 323 1 2 38B 38C 38D 348 Q348 19 1 A 2 1 356 A 34A A 347 332 353 354 B F32A 388 A 334 335 MONK FRYSTON 357 358 345 F364 A 39 1 340 380 366 368 367 A B 421 411 427 371 372 392 375 376 378 370 369 1 2 1 2 A F429 2 1 418 415 40A 41B 1 2 417 487 486 F608 F609 2 1 B A605 604 A617 A618 A B 48D 1 2 2 1 2 1 634 633 635 636 A EALING 716 715 714 W 1 19 735 736 1 2 A 836 835 719 41C A B 40D A B BRAMFORD GRIMSBY WEST KILLINGHOLME SALTEND SOUTH SALTEND NORTH SUTTON BRIDGE SIZEWELL CANTERBURY NORTH RAYLEIGH MAIN CORYTON SOUTH TILBURY KINGS- NORTH BRAINTREE THURCROFT BRINSWORTH DUNGENESS HURST CITY ROAD GREYSTONES THORNTON KEADBY HIGH MARNHAM PELHAM EATON SOCON SELLINDGE A RYE HOUSE WARLEY LITTLEBROOK ROWDOWN WEST HAM PUDDING MILL LANE TOTTENHAM 733 1 2 Q726 732 731 2 1 2 1 2 1 723 722 721 720 F753 2 1 711 712 KIRKSTALL WINCOBANK PITSMOOR SHEFFIELD CITY NORTON LEES TEMPLEBOROUGH BOLNEY CHESSINGTON OSBALDWICK EGGBOROUGH WEST MELTON ALDWARKE RATCLIFFE ON SOAR SUNDON ELSTREE BEDDINGTON NEW CROSS ST JOHNS WOOD CHESTERFIELD GRENDON POPPLETON JORDANTHORPE ENDERBY NINFIELD WATFORD SOUTH WIMBLEDON B B A A A B 262 270 268 F388 212 2 2 1 531 A B 202 269 F251 F253 349 334 343 F390 A 390 350 387 333 235 234 1 F285 238 231 236 285 241 F255 579 519 57B 511 57A 51A F508 508 2 2 A697 881 88B 861 844 842 843 610 A 845 F664 F663 F662 F661 692 R84A 2 1 2 1 2 1 2 1 884 865 848 864 883 847 849 846 788 787 785 784 1 84E 839 862 2 1 718 782 783 2 PADIHAM MACCLESFIELD MINETY SOUTH MANCHESTER BREDBURY WHITE- GATE HARKER HUTTON ELLAND BRADFORD WEST SKELTON GRANGE FERRYBRIDGE 'C' STALYBRIDGE WILLINGTON EAST HAMS HALL COWLEY FLEET EAST CLAYDON IVER WEST WEYBRIDGE LALEHAM RAINHILL WHITSON USKMOUTH ROCHDALE NECHELLS FECKENHAM DRAKELOW BRAMLEY CULHAM JET PENWORTHAM STANAH FRODSHAM DAINES LEGACY HEYSHAM RUGELEY BUSHBURY OCKER HILL OLDBURY WALHAM SEABANK IRON ACTON MELKSHAM BUSTLEHOLM IMPERIAL PARK AXMINSTER CHICKERELL RASSAU KIRKBY LISTER DRIVE CAPENHURST WYLFA FFESTINIOG TRAWSFYNYDD SHREWSBURY BISHOPS WOOD KITWELL SWANSEA NORTH COWBRIDGE PYLE MARGAM BAGLAN BAY ABERTHAW UPPER BOAT CARDIFF EAST ALVERDISCOTT INDIAN QUEENS LANDULPH EXETER ABHAM 852 526 B 27J 22F 27F 2 210 F277 2 R292 245 246 274 532 F528 229 230 252 254 233 232 A84F A808 A80K 1 2 A806 A810 812 813 814 815 2 1 810 809 2 1 857 853 Q858 Q859 B A A 867 502 52A 1 F276 1 R293 A 267 250 244 25A 263 B 1 2 266 283 F252 F254 C2N2 226 224 23D 275 A860 816 817 87D 82D 530 586 516 515 1 2 F506 582 583 1 2 27D 240 253 26C 265 1 2 589 529 873 869 2 876 829 834 877 A 1 2 87B 831 1 2 83D B A 1 879 833 871 1 82A B A 855 82K 82J 854 821 820 811 822 F819 F82E 82E 82F 827 829 82H 581 505 504 58B Q279 2 A 1 2 1 A 2 1 2 27G 22C 220 225 226 F223 F224 22B 22E 213 27E 1 258 219 213 214 259 260 247 248 206 205 1 2 201 204 1 2 R214 A B 1 2 A 214 211 1 2 A B F505 F504 521 2 1 524 525 523 527 2 1 F215 F216 B A 2 3 4 2 1 1 2 2 1 1 2 2 1 1 1 1 2 3 2 1 2 1 2 2 2 1 3 1 1 2 3 1 1 2 1 2 1 IFA 1 - FRANCE 2000MW 1 1 2 2 1 2 2 1 2 1 2 1 1 2 2 1 1 2 1 1 2 2 2 F519 A A 1 2 1 1 A696 609 1 693 338 339 34D 32E 30A 30C Q492 Q493 389 391 669 2 4 3 625 623 E F708 F709 A B PATFORD BRIDGE BERKSWELL STAYTHORPE PENTIR 519 514 575 573 32A 394 B B 65B 1 619 TAUNTON A HINKLEY POINT SOUTH HUMBER BANK WASHWAY FARM 264 A KEARSLEY ROCKSAVAGE CARRINGTON 68A F613 F614 F617 F618 BARKING F725 689 WILLESDEN 503 AMERSHAM MAIN DIDCOT LOVEDEAN BOTLEY WOOD 83A 58A Q278 1 B 501 574 CELLARHEAD SSHARN3 355 33A 38A 271 659 660 WALTHAM CROSS LEIGHTON BUZZARD A608 IRONBRIDGE PENN 520 208 207 BIRKENHEAD 33B 347 209 2 FIDDLERS FERRY 34E HUMBER REFINERY 35F 483 SPALDING NORTH WYMONDLEY MAIN STOCKSBRIDGE CREYKE BECK 1 2 332 34C DRAX FLOWSTH 38C 385 F386 F385 386 39 1 39 1 TREMORFA 408 A Q404 A Q421 2 348 R607 A607 1 2 39 1 39 1 1 2 2 1 1 2 COVENTRY 364 361 359 NEEPSEND 237 52B WILLENHALL 621 667 668 F665 7 691 1 B A A 205 C2M6 S206 S207 1 2 2 1 B71C A 101 107 1 2 1 2 750 751 B 60C 2 1 1 2 65H B 645 B 1 1 2 [... truncated]