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Live Australian Electricity Generation Data (NEM)

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From the live supply and demand graph designer…

We (at GLOBAL-ROAM Pty Ltd) are pleased to be able to work with the RenewEconomy team to assist readers to understand what the fuel mix is that supplies the electricity consumed in Australia’s two main grids, and how this changes over time.

We’ve prepared the following notes to provide some more context to this widget.


This widget was first developed in 2015, and saw several updates after that. At the time it was supply-side focused, and named a “Live Generation Widget”.

Towards the end of 2017, in time for the commissioning of the Tesla/Neoen battery at Hornsdale in SA, we re-built the widget to show both sides of the battery operations. This required the addition of a view of total electricity consumption on a regional basis. Hence we have also upgraded the name to be “Live Supply and Demand Widget”.

We would like to continue developing this widget over time – and we would be grateful whatever feedback you can provide us to guide its ongoing development (you might find answers to your questions in the FAQs page here).


Version 3 of this widget now contains a view of both Supply and Demand for the two main electricity grids that cover the vast majority of Australian electricity consumption:

  1. The eastern half of the country is covered by a single contiguous grid that supports Australia’s National Electricity Market (NEM);
  2. The second main grid is the South-Western Interconnected System (SWIS) that supports the Wholesale Electricity Market (WEM) in the south-western corner of WA, focused on the state capital of Perth.

Here’s three main points to keep in mind, with respect to the data:

Units of measure The widget shows an instantaneous rate of production and consumption (i.e. MWh per hour – or simply MW).
Time of measurement All data is shown as close to your current viewing time as possible.

The widget uses a time stamp of “NEM Time”, which is the time that is used to operate the NEM – with apologies to our clients in Western Australia.

“NEM time” is UTC + 10 hours, which is Brisbane time. NEM time does not adjust for daylight savings.

Source of the data The widget uses three principle sources for the data:

  1. In most cases, data is SCADA data published by AEMO (for Scheduled Generators & Loads, plus some of the larger Semi-Scheduled plant). We aggregate unit level data to fuel type using mapping established in our Generator Catalog.
  2. To show a fuller context of consumption, the widget was updated (March 2015) to match NEM-Watch v10 in also including “APVI Small Solar”. Mouse-over the APVI solar generation for each state to see its individual time-stamp as it can be different for each state/region. The APVI solar data we use is derived by the Australian Photovoltaic Institute (APVI) and published here:Australian PV Institute (APVI) solar map, funded by the Australian Renewable Energy Agency (ARENA)
  3. To show a fuller picture of the fuel source mix used in electricity supply across the country, the widget was also updated (July 2015) to include similar data for the South-West Interconnected System (SWIS) in Western Australia – using data originally published by the Independent Market Operator (IMO-WA), and now by AEMO West, following the merger. Note that this data comes in ½ hourly time steps – the most recent data is shown.

With respect to this supply-side data, we have constructed an equivalent view of demand (i.e. to ensure an “apples-to-apples” comparison). Charging of batteries (pumped storage, or chemical batteries) are shown explicitly.

For more information… For those who want more information about the data, we’re in the process of compiling a more detailed explanation here.

If this page does not answer the questions you have about the Widget, you might find answers on this fuller page of Frequently Asked Questions.

If you can’t find the answers you are looking for, don’t hesitate to provide us your feedback directly (or you can just call us on +61 7 3368 4064).


The “Generation by Fuel Type” widget is one of many charts provided within our NEM-Watch™ software application.

NEM-Watch™ is a dashboard application that most of a diverse range of clients run 24×7 to enable them to keep an eye on how the NEM is operating.

NEM-Watch™ is one of the software products developed by us at GLOBAL-ROAM Pty Ltd (a company focused on making the complexity in Australia’s energy markets understandable to a broad range of people since 2000).

Original source “Renew Economy

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