High Temperatures Cause Power Spikes in Victoria & South Australia


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  • Further weekday incidents in February and March are likely occur, say the Australian Energy Council
  • Victoria’s power network is taking the heat as high temperatures cause price spikes
  • Imports of energy kept the price below the national grid cap amidst fears of the grid being under strain
  • Retail customers shouldn’t feel the pinch, but energy retail companies might depending on their arrangements with wholesalers
  • The Reliability and Emergency Reserve Trader (RERT) is a mechanism in place by the AEMO to help out the grid in periods of extreme demand.

Victoria’s power network is again under scrutiny as high temperatures on Wednesday 7th February caused price hikes in Victoria and South Australia.

At the end of January a heatwave caused the power network to fail when demand levels reached 9144 megawatts in Victoria. Fuses blew out at local power substations leaving 90,000 households without power for their air conditioners.

Temperatures in the high 30s on Wednesday caused further issues for Victoria and South Australia. The power network stayed functional but unprecedented demand caused concerns by the Australian Energy Market Operator (AEMO) about the grid being stretched to capacity and the levels of reserve power available.

Prices were predicted to reach nearly $14,000 a megawatt hour, the national grid cap price, but instead peaked at $6846 a megawatt hour in Victoria and $8001 a megawatt hour in South Australia, thanks to imports of energy reserves. In comparison, NSW peaked at $131 and Queensland peaked at $112 a megawatt hour during the same period.

Unlike the January incident, this latest high demand period occurred during a working week, with many businesses now back in full operation after the summer holidays. The Australian Energy Council (AEC) said that increased loads on the system and heat affecting the infrastructure could cause more weekday incidents.

“As a general rule, February and March demand can be higher than January as there is a lot more industrial load,” said AEC chief executive Matthew Warren.

Grattan Institute’s Energy Director Tony Wood, had a more positive outlook on the grid’s performance and said that although February might push it to its limits, it would take a series of failures before the system experienced a major incident.

Those hardest hit by high temperatures and soaring power prices will be Victorian and South Australia energy retailers who don’t have long term deals with generators or hedging arrangements. Retail customers with existing caps in their contracts shouldn’t be affected by the price spikes.

The AEMO has been monitoring the situation but doesn’t feel the need to pull the trigger on the Reliability and Emergency Reserve Trader (RERT) mechanism. The RERT is a range of dispatchable resources, including battery storage, diesel generation, that can return power to the grid and keep the price below the national grid cap.

Under the RERT around 1,150 megawatts of strategic reserve power can be secured by smelters or large manufacturers who have agreed to reduce their energy consumption, or generate power themselves, to help out the grid in periods of extreme demand.


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Understanding Batteries

Off-Grid Systems

For some households a battery system can be of great benefit and minimise a home’s reliance on the grid. However, it’s important to understand for a battery to be useful your solar system needs to be generating excess energy for the battery to store, which you can then use at night or when the sun is not out.

When selecting a battery, you’ll want to invest in a system that is most suited to your home and can drive the best return on investment (ROI). Despite a larger upfront cost, a higher quality battery may significantly increase your ROI.

    Battery systems start from $6,000 and costs can vary greatly based on the following factors:

  1. Cycle Life-Time

    The number of times a battery can fully charge and discharge.

  2. Battery Power (kW)

    How fast it can be charged or discharged.

  3. Storage Capacity (kWh)

    The maximum amount of energy a battery system can store.

  4. Battery Management System (BMS)

    An electronic ‘smart’ system that gathers data and manages the battery ensuring it does not overload or operate outside of its safe functioning zone..

  5. Inverter

    Battery systems require their own inverter if your solar system does not have a hybrid inverter.

  6. 'All-In-One Unit’

    A system which includes the battery, BMS and an inverter all in one unit.

  7. Warranty

    Length of time or cycles the battery system is under guarantee.

  8. Blackout Protection/Backup

    It’s important to note this is not a common feature of a battery system and could cost thousands of dollars to include. Blackout protection not only requires additional components but also a specialised installation and rewiring. For grid-connected homes, the cost for blackout protection can outweigh the benefit.

Additionally, if your purpose for adding battery is to go Off-Grid and become completely independent from the grid you will need to ensure your solar system can generate enough energy to power your home and your battery system is large enough to store this energy. For homes in metro areas going Off-grid is not cost effective and is only recommended for those in remote areas with limited access to the grid. Off-grid solar systems with battery start at approximately $30,000.

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