By 2018, solar energy had established itself as an economically viable option for supplying energy to large cities . Projections indicate that by 2040, half of all electricity will be generated locally at the point of consumption, marking significant progress in the energy transition. This trend anticipates the end of reliance on coal as the primary source of electricity generation, particularly in countries like Australia.
The impact of solar energy in Queensland
A recent report by The Guardian highlighted how, for the first time ever, the price of electricity in Queensland fell into negative territory for half the day. This occurred in an environment where the average price per megawatt typically ranges between $40 and $50. The price drop in Queensland was mainly due to the rise of solar power, particularly the installed capacity of over 350.000 buildings with solar panels , contributing 1.100 MW of electricity to the grid during peak demand hours.
Typically, low energy prices occur in the early morning hours when demand is lower. However, solar power defied this pattern, driving prices down at midday when coal-fired generators would normally be most profitable. This resulted in many coal-fired generators failing to make significant profits throughout the year.
According to Prime Minister Tony Abbott, Australia has long been considered a land of cheap energy, thanks to its abundant coal reserves. However, the real problem lies in the high distribution costs and energy taxes . This has encouraged Australians to increasingly opt for self-sufficient solutions such as solar panels.
Projections for solar energy adoption in Australia
The cost of installing solar panels, coupled with the benefits of self-sufficiency, has led to projections of exponential growth in the adoption of this technology. By 2023 and 2024, it is expected that 90% of businesses and 75% of homes in Australia will be equipped with solar panels. This trend will be accompanied by energy storage systems (batteries), allowing residential users to store energy and avoid losses from unused surpluses.
Unlimited access to solar panel installation, coupled with the availability of battery storage, allows consumers to consider permanently disconnecting from the electrical grid . In remote areas, where electricity distribution costs are high, this solution is particularly viable. Even in large cities, this transition is being seen as economically feasible and is anticipated for the near future.
The challenge of a possible oversupply of solar energy
Despite the progress, the massive growth of solar energy also presents challenges. One of the main problems is the risk of overloading the grid during periods of low demand, something that, according to the Australian Energy Markets Agency (AEMO), could destabilize the system. A clear example of this occurred in the state of Victoria, where, on a sunny weekend day in 2024, rooftop solar panel production surged, reducing grid demand to dangerously low levels.
To avoid grid disruptions, AEMO implemented several emergency measures such as temporarily disconnecting solar panels and limiting the discharge of surplus energy. In addition, battery owners were notified to keep them empty to absorb excess solar energy.
Although these types of situations present a challenge, they also show the need to advance in the intelligent management of energy surpluses and in the adaptation of the grid infrastructure to cope with the growing penetration of renewable energies.
One of the main problems with solar energy is that its production is intermittent and does not always coincide with peak demand. Therefore, a flexible generation and storage system is needed to harness excess energy during periods of low demand and release it when demand is higher. Large-scale battery installations , both residential and industrial, are one of the proposed solutions.
With the rapid adoption of renewable energy in Australia, solar power is expected to cover up to 70% of the country's electricity needs in the near future , on days with peak solar radiation. This would make Australia a global leader in clean energy and reduce its historical dependence on coal.
The rapid growth of rooftop solar and investment in large solar farms position Australia as a key destination for renewable energy expansion. However, it will be crucial to continue optimizing its electricity grid to handle the increasing volume of solar energy and to more efficiently implement storage solutions that enable greater flexibility in the electricity system.