The World Has Chosen Solar and Batteries. Now Comes the Hard Part.

Ember’s Global Electricity Review 2026 arrived with the kind of headline numbers that would have seemed implausible just a few years ago. Renewables overtook coal in global power generation for the first time in the modern era. Solar met three-quarters of all new global electricity demand growth in 2025. And for only the fifth time this century, total fossil fuel generation fell year-on-year.

For anyone who has spent time in Australia’s solar sector, none of this is surprising. We have been watching the momentum build for years. What is significant now is that the tipping point has arrived, and the data confirms it. The question for Australian solar asset owners is no longer whether to invest in solar and batteries. It is whether they are prepared to manage what they have already invested in.

A Global Shift With Australian Fingerprints

The Ember report highlights two developments that deserve close attention from anyone operating in the Australian energy market.

The first is the trajectory of the world’s two largest fossil fuel consumers. China recorded its first fall in fossil generation since 2015, with solar alone meeting two-thirds of the country’s electricity demand growth last year. India, which had spent four years posting strong fossil fuel increases following its post-COVID economic rebound, also reversed course, recording a decline in fossil generation of 3.3 per cent. These are not incremental movements. They represent a structural shift in how the world’s most energy-hungry nations are choosing to power themselves.

The second development is more relevant to Australia specifically, and it is where the story gets interesting for battery storage.

Australia Is Leading the Battery Transition

The report identifies Australia as one of only two markets globally, alongside Chile, that installed enough battery capacity in 2025 to shift more than 50 per cent of its new solar generation. In Australia’s case, that figure sits at 53 per cent. That is a remarkable achievement for a market of our size.

More telling still is what that battery capacity is actually doing. In the fourth quarter of 2025, batteries were setting peak evening power prices in the National Electricity Market 36 per cent of the time, up from 18 per cent in the same period the year before. The result was a wholesale price reduction of $39 per megawatt-hour during those critical 18:00 to 20:00 hours, bringing average spot prices down from around $100 per MWh to roughly $61 per MWh.

This matters because the evening peak has historically been the most expensive and most fossil fuel-reliant period of the grid’s daily cycle. Batteries are now displacing gas and hydro as the price-setters during precisely the hours when it is most valuable to do so. The economic signal is clear: batteries are not a supplementary technology. They are becoming the backbone of reliable, affordable evening power.

“Set and Forget” Was Always a Myth. Now It Is a Financial Risk.

Here is where the global enthusiasm for solar and storage needs to be grounded in operational reality.

Australia already leads the world in residential solar generation per capita, with 43 per cent of Australian households now carrying their own solar panels. Commercial and industrial deployments have scaled rapidly alongside this. And now battery storage is being layered on top, increasing both the complexity and the value of the assets involved.

The assumption that solar and batteries will simply run themselves, generating returns indefinitely without active management, was never well-founded. But as these systems age and as battery assets are added to the mix, that assumption becomes actively dangerous.

The data on underperformance is not difficult to find. A significant proportion of solar systems across Australia are not generating at their rated capacity, with faults often going undetected by remote monitoring alone. The most common causes are not dramatic failures. They are the accumulated effects of loose connections, degraded components, inadequate ventilation around inverters, and the kind of gradual deterioration that only becomes visible during a hands-on inspection. By the time a fault registers as a performance anomaly on a monitoring dashboard, the losses have often been compounding for weeks or months.

Battery systems introduce additional variables. Thermal management, cycle performance, state-of-health tracking and the interaction between storage assets and the broader energy management system all require active oversight. The more value a battery system provides by responding dynamically to market prices, the more critical it becomes that the system is operating within its designed parameters.

The Maintenance Gap Is the Opportunity Gap

Australia’s solar sector has a well-documented maintenance problem. Systems are installed, commissioned and then left to their own devices. Maintenance is treated as reactive, something that happens after a fault becomes impossible to ignore, rather than as an ongoing investment in the performance of a productive asset.

This approach made more sense when a degraded solar system represented a modest shortfall in generation. It makes far less sense when the same system is integrated with battery storage, when wholesale prices are increasingly volatile, and when the difference between a well-maintained and a poorly maintained system can translate directly into measurable changes in grid revenue and energy cost reduction.

The Ember data shows what is possible when solar and storage work as they should. Evening wholesale prices cut nearly in half. Fossil fuel dependency reduced during the grid’s most critical hours. Returns that justify the investment and then some.

Achieving those outcomes requires more than good hardware. It requires maintenance as a discipline, not an afterthought.

What This Means for Australian Asset Owners

The global energy story of 2025 is one of clean power becoming the default. Solar and batteries won the economic argument, and the grid is now reorganising itself around them. Australia is not watching this from the sideline. We are one of the front-runner markets, and the decisions Australian asset owners make about how to maintain and manage their systems will determine whether they capture the full value of that position.

Regular preventative maintenance, independent of installation or manufacturer bias, data-driven performance monitoring, and proactive identification of degradation before it becomes a fault: these are not optional extras for assets that are expected to deliver returns across a 20-year lifecycle. They are the conditions under which those returns actually materialise.

The world has made its choice. Solar and batteries are the future of electricity. The question is whether your system is maintained well enough to deliver on that promise.