NEM-Watch is installed with an empty database.

When NEM-Watch first starts, it will download the most recent 24 hours of market history – this may take a few minutes, depending on your internet connection speed. You can track the progress of this operation with the status indicator, which will show in the top-right of the display, as shown here:



If you were to keep NEM-Watch running continuously, it will store up to 30 days’ worth of data, removing the old data periodically in order to manage the database size.

The data updated into NEM-Watch comes from a variety of providers, as follows:


AEMO data


The Australian Energy Market Operator (AEMO) operates the NEM.

They publish huge volumes of data (some in real time, some delayed for confidentiality reasons) into the public domain.

NEM-Watch updates a core set of this relevant information to help you filter through the noise to see a clear picture of what’s most important in a market overview.

Here’s an explanation of what NEM-Watch conveys.


APVI data


Beginning with version 10 in 2015, we have introduced a near real-time feed of estimated live aggregate solar output for each region of the NEM.

This estimate is compiled by the Australian PV Institute (APVI) following from development work completed based on funding from ARENA.

This page explains the data provided by the APVI.


BOM data


Beginning in 2001 with the release of NEM-Watch v3, we incorporated into NEM-Watch a feed of weather data for large-size cities around the states that made up the NEM.

This data set is further explained here.


Miscellaneous data


In response to the NEM-wide drought of 2007, we introduced a display of relevant water storages at water in the upgrade to NEM-Watch v8.

As explained here, this required the weekly sampling of a significant number of 3rd party sources to be able to publish a NEM-wide view of relevant (hydro and thermal) water storage capacity.




We continue to be on the lookout for other relevant data sets that will further enhance the value of NEM-Watch as a clear overview of the NEM.

If you have particular data sets in mind, please let us know?