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Network load management Network load management

Information as at 31 March 2017   1:32 a.m.

Current loading and load management measurements

Orion normally controls load to keep it just below our network limit (currently 575 MW ).  We also control load for other reasons, including to avoid localised peaks, to limit our contribution to the region load on the national transmission grid, or in response to faults or emergencies.

Network load Shedding Uncontrolled load Shedable Restorable Temperature
252 MW 0 % 252 MW 37 MW 0 MW 14 °C

Pricing periods

A significant proportion of our costs are driven by the need to meet peak loading demands.  To ensure that consumers make appropriate decisions about when and where to use electricity, we signal this cost driver in our delivery charging via the use of peak periods (for general connections) and control periods (for major customer connections).  Our regular load management tends to flatten out any peaks, so we calculate “uncontrolled load” (our estimate of the loading levels that would have occurred if we had not controlled load) and use this to trigger our pricing periods.  We adjust the on and off trigger points throughout the year to focus on the periods of highest loading without exceeding our target annual duration.  The current trigger points and status of pricing periods are:

  Current
uncontrolled
On
(MW)
Off
(MW)
Group Status Current period
duration (min)
Major customer control period 252 MW 595 575 1 Off 0
      2 Off 0
General connections peak period 252 MW 590 570   Off 0
Generation period         Off 0

Note that pricing periods have minimum durations and our system has load checks to ensure stable operation of the signals – this results in delays for a pricing period to turn on or off once the trigger is reached.

Load Graphs

The following graphs show our current load and load management activities, or you can use the date selector to view graphs from previous days.
Note that the network limit (the black line) is set as a target to keep costs and prices down. The network can cope with higher loading levels, but we will then need to invest in more capacity to maintain an appropriate buffer for growth and security.
Also note that the uncontrolled load (the red line) is not the actual loading level – it’s an estimate of the loading level that would have occurred if we hadn’t tried to keep it down.

Select date to graph:
v
Limit at 01:30 
 575 MW Limit at 01:25 
 575 MW Limit at 01:20 
 575 MW Limit at 01:15 
 575 MW Limit at 01:10 
 575 MW Limit at 01:05 
 575 MW Limit at 01:00 
 575 MW Limit at 00:55 
 575 MW Limit at 00:50 
 575 MW Limit at 00:45 
 575 MW Limit at 00:40 
 575 MW Limit at 00:35 
 575 MW Limit at 00:30 
 575 MW Limit at 00:25 
 575 MW Limit at 00:20 
 575 MW Limit at 00:15 
 575 MW Limit at 00:10 
 575 MW Limit at 00:05 
 575 MW Limit at 00:00 
 575 MW Network load at 01:30 
 252 MW Network load at 01:25 
 255 MW Network load at 01:20 
 257 MW Network load at 01:15 
 262 MW Network load at 01:10 
 265 MW Network load at 01:05 
 270 MW Network load at 01:00 
 273 MW Network load at 00:55 
 278 MW Network load at 00:50 
 283 MW Network load at 00:45 
 288 MW Network load at 00:40 
 287 MW Network load at 00:35 
 284 MW Network load at 00:30 
 285 MW Network load at 00:25 
 285 MW Network load at 00:20 
 287 MW Network load at 00:15 
 289 MW Network load at 00:10 
 294 MW Network load at 00:05 
 297 MW Network load at 00:00 
 300 MW Uncontrolled load at 01:30 
 252 MW Uncontrolled load at 01:25 
 255 MW Uncontrolled load at 01:20 
 259 MW Uncontrolled load at 01:15 
 262 MW Uncontrolled load at 01:10 
 265 MW Uncontrolled load at 01:05 
 270 MW Uncontrolled load at 01:00 
 274 MW Uncontrolled load at 00:55 
 279 MW Uncontrolled load at 00:50 
 283 MW Uncontrolled load at 00:45 
 288 MW Uncontrolled load at 00:40 
 285 MW Uncontrolled load at 00:35 
 284 MW Uncontrolled load at 00:30 
 285 MW Uncontrolled load at 00:25 
 285 MW Uncontrolled load at 00:20 
 287 MW Uncontrolled load at 00:15 
 290 MW Uncontrolled load at 00:10 
 294 MW Uncontrolled load at 00:05 
 297 MW Uncontrolled load at 00:00 
 300 MW Percent shed at 01:30 
 0 % Percent shed at 01:25 
 0 % Percent shed at 01:20 
 0 % Percent shed at 01:15 
 0 % Percent shed at 01:10 
 0 % Percent shed at 01:05 
 0 % Percent shed at 01:00 
 0 % Percent shed at 00:55 
 0 % Percent shed at 00:50 
 0 % Percent shed at 00:45 
 0 % Percent shed at 00:40 
 0 % Percent shed at 00:35 
 0 % Percent shed at 00:30 
 0 % Percent shed at 00:25 
 0 % Percent shed at 00:20 
 0 % Percent shed at 00:15 
 0 % Percent shed at 00:10 
 0 % Percent shed at 00:05 
 0 % Temperature at 01:30 
 14 °C Temperature at 01:25 
 14 °C Temperature at 01:20 
 14 °C Temperature at 01:15 
 14 °C Temperature at 01:10 
 14 °C Temperature at 01:05 
 14 °C Temperature at 01:00 
 14 °C Temperature at 00:55 
 14 °C Temperature at 00:50 
 14 °C Temperature at 00:45 
 14 °C Temperature at 00:40 
 14 °C Temperature at 00:35 
 14 °C Temperature at 00:30 
 14 °C Temperature at 00:25 
 14 °C Temperature at 00:20 
 14 °C Temperature at 00:15 
 14 °C Temperature at 00:10 
 14 °C Temperature at 00:05 
 14 °C Temperature at 00:00 
 14 °C USI load at 01:30 
 488 MW USI load at 01:25 
 492 MW USI load at 01:20 
 497 MW USI load at 01:15 
 504 MW USI load at 01:10 
 507 MW USI load at 01:05 
 513 MW USI load at 01:00 
 519 MW USI load at 00:55 
 527 MW USI load at 00:50 
 534 MW USI load at 00:45 
 540 MW USI load at 00:40 
 538 MW USI load at 00:35 
 539 MW USI load at 00:30 
 542 MW USI load at 00:25 
 544 MW USI load at 00:20 
 547 MW USI load at 00:15 
 553 MW USI load at 00:10 
 561 MW USI load at 00:05 
 568 MW USI load at 00:00 
 572 MW Network load at 01:30 
 252 MW Network load at 01:25 
 255 MW Network load at 01:20 
 257 MW Network load at 01:15 
 262 MW Network load at 01:10 
 265 MW Network load at 01:05 
 270 MW Network load at 01:00 
 273 MW Network load at 00:55 
 278 MW Network load at 00:50 
 283 MW Network load at 00:45 
 288 MW Network load at 00:40 
 287 MW Network load at 00:35 
 284 MW Network load at 00:30 
 285 MW Network load at 00:25 
 285 MW Network load at 00:20 
 287 MW Network load at 00:15 
 289 MW Network load at 00:10 
 294 MW Network load at 00:05 
 297 MW Network load at 00:00 
 300 MW

Water heating (residential)

Our load management primarily focuses on storage water heating, where supply can be interrupted for a period of time without affecting the availability of hot water.  Our control simply delays the heating of water cylinders until the peak load or network constraint has passed.  To ensure that customers are not adversely affected by our load management activities, we agree a set of long term service level targets with electricity retailers.  We then aim to limit load (and therefore delivery costs and charges) to the maximum extent possible without breaching these agreed service level targets - this is a challenging cost/quality trade-off to achieve, and we actively report on our results.

The following tables show the extent of shedding for residential and business customers with water heating linked to an ‘economy’ or ‘composite’ electricity option. Customers with night option or night with an afternoon boost are not affected by this load control. Numbers in the table are in hours and minutes.

Residential load management channels
Service level target: No more than 4 hours off in any 8 hour period
Performance: Average duration
(hours off)
Longest duration
(hours off)
In the last 8 hours (see graph) 0:00 0:00
In any 8 hour period today 0:00 0:00
In any 8 hour period yesterday 0:00 0:00

The following spreadsheet shows a history of residential water heating service performance:

Residential water heating service performance history (xslx)

Percent shed at 01:30 
 0 % Percent shed at 01:25 
 0 % Percent shed at 01:20 
 0 % Percent shed at 01:15 
 0 % Percent shed at 01:10 
 0 % Percent shed at 01:05 
 0 % Percent shed at 01:00 
 0 % Percent shed at 00:55 
 0 % Percent shed at 00:50 
 0 % Percent shed at 00:45 
 0 % Percent shed at 00:40 
 0 % Percent shed at 00:35 
 0 % Percent shed at 00:30 
 0 % Percent shed at 00:25 
 0 % Percent shed at 00:20 
 0 % Percent shed at 00:15 
 0 % Percent shed at 00:10 
 0 %

Water heating Business

Business load management channels
Service level target: No more than 2 hours off in any 5 hour period
Performance: Average duration
(hours off)
Longest duration
(hours off)
In the last 5 hours (see graph) 0:00 0:00
In any 5 hour period today 0:00 0:00
In any 5 hour period yesterday 0:00 0:00

Percent shed at 01:30 
 0 % Percent shed at 01:25 
 0 % Percent shed at 01:20 
 0 % Percent shed at 01:15 
 0 % Percent shed at 01:10 
 0 % Percent shed at 01:05 
 0 % Percent shed at 01:00 
 0 % Percent shed at 00:55 
 0 % Percent shed at 00:50 
 0 % Percent shed at 00:45 
 0 % Percent shed at 00:40 
 0 % Percent shed at 00:35 
 0 % Percent shed at 00:30 
 0 % Percent shed at 00:25 
 0 % Percent shed at 00:20 
 0 % Percent shed at 00:15 
 0 % Percent shed at 00:10 
 0 %

Pricing periods history

The following spreadsheets provide a history of our pricing periods:

General Connection Peak period (xlsx)
  The last peak period occurred on 24/08/2016 from 17:26 to 19:11.

Major customer control period Group 1 (xlsx)
  The last group 1 control period occurred on 24/08/2016 from 17:51 to 18:54.

Major customer control period Group 2 (xlsx)
  The last group 2 control period occurred on 24/08/2016 from 17:51 to 18:55.

Generation period (xlsx)
  The last generation period occurred on 08/09/2016 from 10:32 to 15:05.


Disclaimer

Orion injects ripple signals into its network to identify its pricing periods (peak periods, control periods and generation periods) which are used to establish charges for delivery and credits for export and generation. The records of these pricing periods, as listed in the linked spreadsheets, are verified at the end of each season.

Orion also provides email and text messages to notify pricing periods and a range of other information which is displayed on the dashboard web page. These additional messages and information are provided to assist customers and retailers, but their accuracy and availability is not guaranteed. In our experience, email and text messages are occasionally delayed or lost and, from time to time, the information on this web page may not be available or may be incorrect. We do not accept liability for any direct or indirect loss or damage that may be suffered as a result of using this additional information.

Please email us if you find any errors on this page or have any comments or suggestions for improvements.