Weekly Summary and Security of Supply Reporting

Transpower’s Market Operations team supports the operation of the wholesale electricity market, helps implement market initiatives, and investigates how future market developments may impact System Operations. This page is intended as a source for Electricity Market information  including security of supply reporting we are able to make available to our external customers. This includes new types of information, as well as links to information posted elsewhere on the Transpower website.

If you have any comments or questions please contact the Market Operations Team at Market.Operations@transpower.co.nz.

Subscribing to our Weekly Market Movements

We send out weekly updates on a Tuesday covering market trends and security of supply updates. If you wish to suscribe to these click here to be added to our subscription list. 

Latest Report

Latest Weekly Market Movements [ pdf 3.79 MB ]

Weekly Market Movements (from  6 July 2021)

2021
Aug          
Jul 6 Jul [ pdf 3.94 MB ] 13 Jul [ pdf 3.78 MB ] 18 Jul [ pdf 3.79 MB ]    

Market Matters

These reports provide technical explanations and market observations for traders and analysts.

2021
TPM - Removal of RCPD [ pdf 516.05 KB ] 19 July 2021

Does Size Matter [ pdf 187.24 KB ]

30 June 2021
New record demand set on 29 June 2021 [ pdf 128.85 KB ] 30 June 2021
Forecasting Intermittent Generation in NZ [ pdf 1.51 MB ] 29 June 2021
2020
Gas Outlook for Electricity Generation and Security of Supply 2021 [ pdf 950.59 KB ] 3 December 2020
Effect of La Nina and El Nino on New Zealand Hydrological Inflows [ pdf 648.61 KB ] 19 October 2020
Thermal and Water Behaviour Article [ pdf 468.51 KB ] 18 June 2020
Lockdown demand changes [ pdf 411.08 KB ] 27 March 2020
2019
Salt Deposits on HVDC Insulators [ pdf 594.94 KB ] 12 June 2019
NMIR - A Continuous Improvement Journey [ pdf 617.6 KB ] 28 May 2019
Shortfall Indications and Security Notices [ pdf 547.67 KB ] 3 May 2019
Wind Forecasting [ pdf 584.25 KB ] 30 April 2019
Gas Market, Electricity Capacity and the System Operator [ pdf 690.38 KB ] 4 April 2019
Heatwave sets summer demand records [ pdf 597.4 KB ] 5 February 2019
2018
Double Contingency Risk [ pdf 636.23 KB ] 4 December 2018
Filters and HVDC Pole Block Scheme [ pdf 760.55 KB ] 21 November 2018
Unprecedentedly High Prices and How They Relate to the Gas Market [ pdf 770.24 KB ] 7 November 2018
Improvements to Load Forecast Inputs [ pdf 431.44 KB ] 5 October 2018
High Spring Washer Prices 17 September 2018 [ pdf 573.3 KB ] 21 September 2018
Market Node Constraints [ pdf 641.69 KB ] 24 August 2018
What contributes to HVDC utilisation [ pdf 557.72 KB ] 17 August 2018
The effect of wind generation on energy prices 25th and 27th July [ pdf 433.32 KB ] 8 August 2018
What caused very high prices for 12 June 2018 and why were they not forecast [ pdf 541.54 KB ] 20 June 2018

Price Spikes and Price Stacks [ pdf 670.9 KB ]

8 May 2018
Amending Modulation Risk to manage system security [ pdf 531.88 KB ] 2 May 2018
Hawkes Bay High Prices 21 February 2018 [ pdf 591.28 KB ]  16 March 2018
Market Spotlight 2017 the year that was [ pdf 559.22 KB ] 18 January 2018
2017
High Prices [ pdf 560.89 KB ] 18 December 2017
HVDC Outage [ pdf 576.3 KB ] 1 December 2017
Maraetai birds contingent event [ pdf 674.81 KB ] 24 November 2017
Management of North Island Over Frequency Risk [ pdf 390.51 KB ] 10 November 2017
Market impact of reserve sharing [ pdf 718.8 KB ] 2 August 2017
Further pricing details for the 12th to 15th July 2017 [ pdf 686.4 KB ] 31 July 2017
How the HVDC transfer sticky point at 22.5MW occurs and how it affects the market [ pdf 821.04 KB ] 12 July 2017

Historic  Security of Supply and Market Summary Reports

From mid 2017 until 1 July 2021 the security of supply weekly report and the Market Weekly summary were sent out as separate reports. The separate report are available in the below tables.

Security of Supply Weekly Reports up 1 July 2021

2021 Weekly
Jul 1 Jul 21 [ pdf 3.01 MB ]        
Jun 3 Jun 21 [ pdf 2.98 MB ] 10 Jun 21 [ pdf 3.01 MB ] 17 Jun 21 [ pdf 3.04 MB ] 24 Jun 21 [ pdf 2.99 MB ]  
May 6 May 21 [ pdf 2.81 MB ] 13 May 21 [ pdf 2.82 MB ] 20 May 21 [ pdf 2.83 MB ] 27 May 21 [ pdf 2.87 MB ]  
Apr 1 Apr 21 8 Apr 21 15 Apr 21 [ pdf 2.94 MB ] 22 Apr 21 [ pdf 2.79 MB ] 29 Apr 21 [ pdf 2.77 MB ]
Mar 4 Mar 21 11 Mar 21 18 Mar 21 25 Mar 21  
Feb 4 Feb 21 11 Feb 21 18 Feb 21 25 Feb 21  
Jan 14 Jan 21 21 Jan 21 28 Jan 21    
2021 Daily
Monday Tuesday Wednesday Friday
12 Apr [ pdf 2.88 MB ] 13 Apr [ pdf 2.91 MB ] 14 Apr [ pdf 2.91 MB ] 16 Apr [ pdf 2.95 MB ]
19 Apr [ pdf 2.97 MB ] 20 Apr [ pdf 2.85 MB ] 21 Apr [ pdf 2.88 MB ] 23 Apr [ pdf 2.85 MB ]
  27 Apr [ pdf 2.85 MB ] 28 Apr [ pdf 2.85 MB ] 30 Apr [ pdf 2.85 MB ]
3 May [ pdf 2.86 MB ] 4 May [ pdf 2.86 MB ] 5 May [ pdf 2.86 MB ] 7 May [ pdf 2.86 MB ]
10 May [ pdf 2.86 MB ] 11 May [ pdf 2.86 MB ] 12 May [ pdf 2.86 MB ] 14 May [ pdf 2.87 MB ]
17 May [ pdf 2.87 MB ] 18 May [ pdf 2.83 MB ]    
2020
Dec 3 Dec 10 Dec 17 Dec 23 Dec  
Nov 5 Nov 12 Nov 19 Nov 26 Nov  
Oct 1 Oct 8 Oct 15 Oct 22 Oct 29 Oct
Sep 3 Sep 10 Sep 17 Sep 24 Sep  
Aug 6 Aug 13 Aug 20 Aug 27 Aug  
Jul 2 Jul 9 Jul 16 Jul 23 Jul 30 Jul
Jun 4 Jun 11 Jun 18 Jun 25 Jun  
May 7 May 12 May 21 May 28 May  
Apr 2 Apr 9 Apr 16 Apr 23 Apr 30 Apr
Mar 5 Mar 12 Mar 19 Mar 26 Mar  
Feb 5 Feb 13 Feb 20 Feb 27 Feb  
Jan 16 Jan 23 Jan 30 Jan    
2019
Dec 5 Dec 12 Dec 19 Dec    
Nov 7 Nov 14 Nov 21 Nov 28 Nov  
Oct 3 Oct 10 Oct 17 Oct 24 Oct 30 Oct
Sep 5 Sep 11 Sep 19 Sep 26 Sep  
Aug 1 Aug 8 Aug 15 Aug 22 Aug 29 Aug
Jul 2 Jul 9 Jul 16 Jul 25 Jul  
Jun 4 Jun 11 Jun 18 Jun 25 Jun  
May 5 May 12 May 21 May 28 May  
Apr 2 Apr 9 Apr 16 Apr 23 Apr 30 Apr
Mar 5 Mar 12 Mar 19 Mar 26 Mar  
Feb 5 Feb 12 Feb 19 Feb 26 Feb  
Jan 15 Jan 20 Jan 29 Jan    

Market Summaries up to 27 June 2021

2021
Jun 6 Jun 21 [ pdf 794.62 KB ] 13 Jun 21 [ pdf 664.47 KB ] 20 Jun 21 [ pdf 659.31 KB ] 27 Jun 21 [ pdf 669.03 KB ]  
May 2 May 21 [ pdf 788.58 KB ] 9 May 21 [ pdf 797.31 KB ] 16 May 21 [ pdf 626.62 KB ] 23 May 21 [ pdf 555.74 KB ] 30 May 21 [ pdf 1.19 MB ]
Apr 4 Apr 21 [ pdf 649.36 KB ] 11 Apr 21 [ pdf 668.06 KB ] 18 Apr 21 [ pdf 687.52 KB ] 25 Apr 21 [ pdf 610.63 KB ]  
Mar 7 Mar 21 [ pdf 685.63 KB ] 14 Mar 21 [ pdf 849.76 KB ] 21 Mar 21 [ pdf 618.34 KB ] 28 Mar 21 [ pdf 749.55 KB ]  
Feb 7 Feb 21 [ pdf 687.3 KB ] 14 Feb 21 [ pdf 1.12 MB ] 21 Feb 21 [ pdf 668.37 KB ] 28 Feb 21 [ pdf 735.11 KB ]  
Jan 10 Jan 21 [ pdf 797.52 KB ] 17 Jan 21 [ pdf 586.56 KB ] 24 Jan 21 [ pdf 703.27 KB ] 31 Jan 21 [ pdf 1.13 MB ]  
2020
Dec 6 Dec 20 [ pdf 880.61 KB ] 13 Dec 20 [ pdf 870.08 KB ] 20 Dec 20 [ pdf 1.08 MB ]    
Nov 1 Nov 20 [ pdf 597.6 KB ] 8 Nov 20 [ pdf 1.87 MB ] 15 Nov 20 [ pdf 2.21 MB ] 22 Nov 20 [ pdf 854.31 KB ] 29 Nov 20 [ pdf 910.55 KB ]
Oct 4 Oct 20 [ pdf 808.32 KB ] 11 Oct 20 [ pdf 791.24 KB ] 18 Oct 20 [ pdf 980.56 KB ] 25 Oct 20 [ pdf 958.58 KB ]  
Sep 6 Sep 20 [ pdf 759.34 KB ] 13 Sep 20 [ pdf 928.41 KB ] 20 Sep 20 [ pdf 944.11 KB ] 27 Sep 20 [ pdf 982.81 KB ]  
Aug 2 Aug 20 [ pdf 1.25 MB ] 9 Aug 20 [ pdf 754.2 KB ] 16 Aug 20 [ pdf 783.09 KB ] 23 Aug 20 [ pdf 923.24 KB ] 30 Aug 20 [ pdf 795.23 KB ]
Jul 4 Jul 20 [ pdf 409.88 KB ] 12 Jul 20 [ pdf 423.1 KB ] 19 Jul 20 [ pdf 837.42 KB ] 26 Jul 20 [ pdf 962.71 KB ]  
Jun 7 Jun 20 [ pdf 327.58 KB ] 14 Jun 20 [ pdf 342.66 KB ] 21 Jun 20 [ pdf 330.1 KB ] 28 Jun 20 [ pdf 396.69 KB ]  
May 3 May 20 [ pdf 380.88 KB ] 10 May 20 [ pdf 886.88 KB ] 17 May 20 [ pdf 394.69 KB ] 24 May 20 [ pdf 292.63 KB ] 31 May 20 [ pdf 259.77 KB ]
Apr 5 Apr 20 [ pdf 258.44 KB ] 12 Apr 20 [ pdf 624.31 KB ] 19 Apr 20 [ pdf 312.67 KB ] 26 Apr 20 [ pdf 256.27 KB ]  
Mar 1 Mar 20 [ pdf 267.63 KB ] 8 Mar 20 [ pdf 238.19 KB ] 15 Mar 20 [ pdf 278.94 KB ] 22 Mar 20 [ pdf 307.71 KB ] 29 Mar 20 [ pdf 275.05 KB ]
Feb 2 Feb 20 [ pdf 272.21 KB ] 9 Feb 20 [ pdf 278.94 KB ] 16 Feb 20 [ pdf 242.88 KB ] 23 Feb 20 [ pdf 371.54 KB ]  
Jan 6 Jan 20 [ pdf 218.08 KB ] 12 Jan 20 [ pdf 226.3 KB ] 19 Jan 20 [ pdf 315.67 KB ] 26 Jan 20 [ pdf 265.4 KB ]  
2019
Dec 1 Dec 19 [ pdf 392.1 KB ] 8 Dec 19 [ pdf 303.38 KB ] 15 Dec 19 [ pdf 225.4 KB ]    
Nov 3 Nov 19 [ pdf 433.74 KB ] 10 Nov 19 [ pdf 561.32 KB ] 17 Nov 19 [ pdf 372.48 KB ] 24 Nov 19 [ pdf 596.33 KB ]  
Oct 6 Oct 19 [ pdf 581.68 KB ] 13 Oct 19 [ pdf 434.31 KB ] 20 Oct 19 [ pdf 324.09 KB ] 28 Oct 19 [ pdf 465.79 KB ]  
Sep 1 Sep 19 [ pdf 651.32 KB ] 8 Sep 19 [ pdf 654.14 KB ] 15 Sep 19 [ pdf 499.48 KB ] 22 Sep 19 [ pdf 536.34 KB ] 29 Sep 19 [ pdf 629.63 KB ]
Aug 4 Aug 19 [ pdf 928.05 KB ] 11 Aug 19 [ pdf 554.58 KB ] 18 Aug 19 [ pdf 485.49 KB ] 25 Aug 19 [ pdf 688.91 KB ]  
Jul 7 Jul 19 [ pdf 765.97 KB ] 14 Jul 19 [ pdf 848.25 KB ] 21 Jul 19 [ pdf 906.59 KB ] 28 Jul 19 [ pdf 779.1 KB ]  
Jun 2 Jun 19 [ pdf 768.6 KB ] 9 Jun 19 [ pdf 672.33 KB ] 16 Jun 19 [ pdf 819.98 KB ] 23 Jun 19 [ pdf 849.02 KB ] 30 Jun 19 [ pdf 696.18 KB ]
May 5 May 19 [ pdf 554.12 KB ] 12 May 19 [ pdf 642.78 KB ] 19 May 19 [ pdf 617.27 KB ] 26 May 19 [ pdf 717.39 KB ]  
Apr 7 Apr 19 [ pdf 601.83 KB ] 14 Apr 19 [ pdf 519.5 KB ] 21 Apr 19 [ pdf 526.18 KB ] 28 Apr 19 [ pdf 491.85 KB ]  
Mar 3 Mar 19 [ pdf 530.66 KB ] 10 Mar 19 [ pdf 509.99 KB ] 17 Mar 19 [ pdf 474.91 KB ] 24 Mar 19 [ pdf 506.88 KB ] 31 Mar 19 [ pdf 515.23 KB ]
Feb 5 Feb 19 [ pdf 494 KB ] 12 Feb 19 [ pdf 489.2 KB ] 17 Feb 19 [ pdf 475.36 KB ] 24 Feb 19 [ pdf 560.89 KB ]  
Jan 13 Jan 19 [ pdf 495.9 KB ] 20 Jan 19 [ pdf 502.28 KB ] 27 Jan 19 [ pdf 479.88 KB ]    
2018
Dec 2 Dec 18 [ pdf 576.92 KB ] 9 Dec 18 [ pdf 608.76 KB ] 16 Dec 18 [ pdf 553.44 KB ]    
Nov 4 Nov 18 [ pdf 669.38 KB ] 11 Nov 18 [ pdf 514.6 KB ] 18 Nov 18 [ pdf 495.63 KB ] 25 Nov 18 [ pdf 556.57 KB ]  
Oct 7 Oct 18 [ pdf 627.41 KB ] 14 Oct 18 [ pdf 479.64 KB ] 21 Oct 18 [ pdf 456.36 KB ] 28 Oct 18 [ pdf 698.89 KB ]  
Sep 2 Sep 18 [ pdf 597.29 KB ] 9 Sep 18 [ pdf 590.31 KB ] 16 Sep 18 [ pdf 594.24 KB ] 23 Sep 18 [ pdf 597.5 KB ] 30 Sep 18 [ pdf 586.15 KB ]
Aug 5 Aug 18 [ pdf 501.94 KB ] 12 Aug 18 [ pdf 561.06 KB ] 19 Aug 18 [ pdf 541.51 KB ] 26 Aug 18 [ pdf 497.5 KB ]  
Jul 1 Jul 18 [ pdf 597.48 KB ] 8 Jul 18 [ pdf 532.2 KB ] 15 Jul 18 [ pdf 494.1 KB ] 22 Jul 18 [ pdf 488.52 KB ] 29 Jul 19 [ pdf 514.62 KB ]
Jun 3 Jun 18 [ pdf 492.17 KB ] 10 Jun 18 [ pdf 570.53 KB ] 17 Jun 18 [ pdf 496.53 KB ] 24 Jun 18 [ pdf 483.7 KB ]  
May 6 May 18 [ pdf 485.41 KB ] 13 May 18 [ pdf 547.54 KB ] 20 May 18 [ pdf 659.94 KB ] 27 May 18 [ pdf 506.23 KB ]  
Apr 1 Apr 18 [ pdf 637.51 KB ] 8 Apr 18 [ pdf 669.64 KB ] 22 Apr 18 [ pdf 526.19 KB ] 29 Apr 18 [ pdf 571.92 KB ]  
Mar 4 Mar 18 [ pdf 672.25 KB ] 11 Mar 18 [ pdf 563.85 KB ] 18 Mar 18 [ pdf 542.65 KB ] 25 Mar 18 [ pdf 517.91 KB ]  
Feb 4 Feb 18 [ pdf 718.4 KB ] 11 Feb 18 [ pdf 681.38 KB ] 18 Feb 18 [ pdf 726.86 KB ] 25 Feb 18 [ pdf 619.99 KB ]  
Jan 14 Jan 18 [ pdf 659.62 KB ] 21 Jan 18 [ pdf 654.46 KB ] 28 Jan 18 [ pdf 659.23 KB ]    
2017
Dec 3 Dec 17 [ pdf 647.72 KB ] 10 Dec 17 [ pdf 602.4 KB ] 17 Dec 17 [ pdf 690.26 KB ]    
Nov 5 Nov 17 [ pdf 782.39 KB ] 12 Nov 17 [ pdf 626.41 KB ] 19 Nov 17 [ pdf 636.32 KB ]    
Oct 1 Oct 17 [ pdf 734.7 KB ] 8 Oct 17 [ pdf 605.35 KB ] 15 Oct 17 [ pdf 605.9 KB ] 22 Oct 17 [ pdf 632.49 KB ] 29 Oct 17 [ pdf 655.24 KB ]
Sep 3 Sep 17 [ pdf 694.4 KB ] 17 Sep 17 [ pdf 651.1 KB ] 24 Sep 17 [ pdf 634.33 KB ]    
Aug 6 Aug 17 [ pdf 695.46 KB ] 13 Aug 17 [ pdf 822.39 KB ] 27 Aug 17 [ pdf 710.61 KB ]    
Jul 9 Jul 17 [ pdf 416.1 KB ] 16 Jul 17 [ pdf 500.69 KB ] 23 Jul 17 [ pdf 623.14 KB ] 30 Jul 17 [ pdf 699 KB ]