How do microgrids work?

A microgrid is a small network of power generation, storage and control technologies that are designed to supply a small group of consumers with electricity while operating independently of the central grid. 

A microgrid can operate autonomously, supplied by energy sources like solar generation, battery storage and diesel power, when power supply from the main grid is disrupted by extreme weather events or is otherwise unavailable. 

A microgrid is designed to increase the reliability and resilience of the network and the community.

What was being planned for this project?

The first step in this trial was to develop a low voltage connected microgrid at Merriwa, capable of supplying power to identified premises along Bettington Street, in the centre of town during major outages.

The microgrid includes small scale power generation (solar panels and a back-up diesel generator), storage (batteries) and control technologies. The microgrid will be able to operate during planned and unplanned power interruptions – switching on to maintain supply automatically to homes and businesses in the trial area.

It will also include powering two locations that can act as ‘Community Hubs’ to improve Merriwa’s resilience to disruptive events by providing services such as refrigeration, laundry and showering facilities and a central meeting point. These Community Hubs will be at the Merriwa RSL and the Merriwa Country Women’s Association rooms.

What is a community hub? 

A community hub is a place for the community to come together during an emergency and access essential services – for example charging phones, satellite wi-fi internet, washing, refrigeration and cooking.

A community hub is generally located at a large and easily accessible venue like a community hall.

As part of the Merriwa microgrid trial, we have worked with the community to determine that they see value in the Community Hubs and what services they should deliver. We will continue work with local partners to design and run the community hub to meet community needs. 

What location and technology did Ausgrid choose for the microgrid? 

Ausgrid has considered a range of possible locations, with a focus on areas where we need to improve system reliability and resilience for customers. Merriwa has been selected as the preferred location because: 

• the existing network configuration means there is a risk of extended outages to the area 
• the conditions at our Merriwa Depot are right for this project, with the right amount of space, sunlight and support for an effective trial 
• our climate assessments show that the Merriwa and Upper Hunter areas will be some of the most impacted by climate change across Ausgrid's system in coming decades. 

The technology is now at a stage that we are confident it will work reliably and cost effectively. 

The microgrid generation and storage infrastructure has been installed at Ausgrid’s Merriwa Depot.

What are the benefits of this project? 

Ausgrid climate impact research for the Upper Hunter shows by 2050 we can expect to see an increase in all types of climate risks such as heat, storms and bushfire.

A microgrid allows Ausgrid to provide a more resilient electricity supply to customers. The microgrid maintains electricity to connected customers, and customers outside the microgrid area can access services provided within the proposed Community Hub, which will be connected to the microgrid.

Can you provide an update on the copper theft and how has it delayed the project?

Due to recent theft of copper earthing bars from both the 33kV power line that connects Merriwa to the Ausgrid network and the 11kV power lines that link parts of the town, we have need to perform repairs. This has required some planned outages.

Unfortunately, there has been an increase in copper theft across Ausgrid’s network. Copper theft puts lives at risk, costs customers and disrupts the safe delivery of energy. If you see disconnected wiring, cut cables or fallen powerlines always assume they are live, stay at least eight metres back and call Ausgrid on 13 13 88. Ausgrid has reported all known copper theft incidents to the police. Anyone who may have any information is urged to contact Crimestoppers on 1800 333 000.

For more information 

If you would like to contact us, please email the Ausgrid Innovation Program on innovation@ausgrid.com.au.