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Key Points
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- Renewable energy and storage supplied 51 percent of National Electricity Market electricity in Q4 2025, the first time the majority threshold was crossed in the market's 25-year history.[1]
- Coal-fired generation fell to an all-time quarterly low of 11,544 megawatts and wholesale electricity prices dropped 44 percent year-on-year to $50 per megawatt hour.[1]
- Wind generation grew 29 percent year-on-year and battery discharge nearly tripled, with 3,796 megawatts of new battery capacity entering service across the NEM.[1]
- The federal Capacity Investment Scheme, expanded to 40 gigawatts in July 2025, will support around $73 billion in electricity sector investment through 2027.[11]
- Coal communities in the Hunter Valley, Latrobe Valley and Bowen Basin face accelerating transition pressures, and Australia has yet to establish a national coal exit framework to coordinate orderly capacity retirement.[8]
- AEMO's 2026 Integrated System Plan requires total NEM generation and storage capacity to triple from 82 gigawatts to 297 gigawatts by 2050 to maintain reliability.[6]
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Australia crossed a historic energy threshold in late 2025.
Renewable sources, including battery storage, supplied 51 percent of National Electricity Market electricity. The milestone marks a structural break from more than five decades of coal dominance.
The Australian Energy Market Operator confirmed the result in its Q4 2025 Quarterly Energy Dynamics report. Wind generation rose 29 percent while grid-scale solar climbed 15 percent compared with Q4 2024. Battery discharge nearly tripled to an average of 268 megawatts across the quarter.[1]
Coal-fired generation fell to an all-time quarterly low as cheap renewable supply displaced fossil fuels. Wholesale electricity prices simultaneously halved to an average of $50 per megawatt hour. Both trends confirm the transition is structural and accelerating beyond earlier projections.[2]
The Historic Milestone: Measuring the Shift
The fourth quarter of 2025 became the most consequential period in Australian electricity history. Renewable energy and storage delivered 51 percent of National Electricity Market supply. AEMO's Quarterly Energy Dynamics report, released on 29 January 2026, confirmed the threshold was crossed.[1]
The NEM stretches across six states and the ACT, forming one of the world's longest interconnected alternating current systems. Individual states had previously achieved temporary renewable majorities during brief periods of high solar output. A sustained majority across a full calendar quarter confirms a structural rather than transient shift.[3]
AEMO's chief executive confirmed the result reflected years of sustained investment across the electricity system. Increased renewable and storage output lowered both average spot prices and high-priced interval incidence. The energy component of wholesale prices fell from $71 per megawatt hour in Q4 2024 to $47 in Q4 2025.[1]
Western Australia's Wholesale Electricity Market simultaneously reached 52.4 percent renewable and storage supply. Renewable output in that market peaked at 91.1 percent late in the quarter. The parallel milestone confirmed the transition was occurring across all of Australia's main grids.[2]
AEMO distinguishes sustained structural majorities from temporary weather-driven surges through quarterly averaging. A single quarter encompasses more than 2,200 half-hourly dispatch intervals across the entire NEM. Maintaining a majority share across that full interval set validates the structural nature of the shift.[1]
Climate Council analysis in May 2025 documented a record Q1 renewable share of 43 percent of NEM supply. Grid-scale solar, battery generation and wind each set new first-quarter records in that period. The trajectory confirmed the renewable majority was a matter of months rather than years away.[4]
The renewable share dipped to 46.5 percent in Q1 2026, a new Q1 record but below 50 percent. Seasonal factors reduce solar output during the southern hemisphere autumn and winter months. The Q1 2026 result marked the highest renewable share ever recorded for a first quarter.[5]
The Technology Breakdown: Wind, Solar and Hydro
Wind energy delivered the single largest variable renewable contribution to the Q4 2025 milestone. Variable renewable energy output averaged 6,627 megawatts across the quarter, a new all-time record. Wind generation rose 29 percent year-on-year, reflecting new capacity and improved seasonal wind conditions.[1]
Grid-scale solar output climbed 15 percent from Q4 2024, adding significant midday generation capacity. Rooftop solar, installed on more than three million Australian homes, supplied approximately 15 percent of NEM supply. Combined rooftop and utility solar made solar collectively the largest renewable technology by energy contribution.[1]
Rooftop solar's growth has fundamentally reshaped the NEM's daily demand profile. Midday grid demand has fallen sharply as household generation reduces the need for wholesale supply. AEMO incorporated best estimates of distributed photovoltaic generation into its supply mix calculations.[1]
Wind generation growth was strongest in Victoria and Queensland during the 2025 transition period. New South Wales recorded new highs in grid-scale solar output, contributing to that state's renewable lift. Transmission constraints in several NEM regions continue to limit the full export of available renewable generation.[6]
Hydro generation declined in Q4 2025, partially offsetting gains from wind and solar platforms. Snowy Hydro 2.0, Australia's largest pumped storage project, remains under construction with completion delayed. Existing hydro assets in Tasmania and the Snowy scheme provided essential dispatchable backup across the quarter.[6]
Battery discharge nearly tripled during Q4 2025, averaging 268 megawatts across all NEM regions. New large-scale battery capacity of 3,796 megawatts and 8,602 megawatt hours entered service from late 2024. Batteries now absorb excess midday solar and release it during evening peaks, displacing gas generation.[1]
South Australia demonstrated the upper limit of current renewable penetration at a regional level. The state reached 98.7 percent renewable generation in September 2025, its highest recorded share. The minimum synchronous generator requirement was reduced to a single unit to enable that result.[3]
Coal's Contraction: Plant Closures and Stranded Assets
Coal-fired generation fell to an all-time quarterly low across the NEM in Q4 2025. Average output reached just 11,544 megawatts, a 4.6 percent decline from Q4 2024. Both black and brown coal generators recorded new quarterly lows in the same period.[1]
AGL Energy's Liddell power station in the Hunter Valley closed in April 2023 after 52 years of operation. AGL plans to build a 500 megawatt battery at the Liddell site as part of a Hunter Energy Hub. Origin Energy's Eraring station, Australia's largest at 2.8 gigawatts, had its closure delayed for grid stability planning.[7]
AGL's coal assets account for approximately 8 percent of Australia's total greenhouse gas emissions. The company's climate transition plan commits to eliminating coal combustion and replacing it with renewable capacity. AGL's ASX disclosures recognise accelerating closure timelines driven by economics rather than regulatory mandate.[7]
Queensland's state-owned CS Energy operates the Callide and Kogan Creek coal stations across the state's grid. The 2021 Callide C explosion demonstrated the reliability risks inherent in ageing coal infrastructure. Rising operating costs and renewable competition challenge coal's financial viability across the Queensland fleet.[6]
EnergyAustralia's Yallourn brown coal station in Victoria's Latrobe Valley is scheduled to close in 2028. Western Australia's Collie power station is slated for closure in 2027 and Muja in 2029. The combined retirement of these plants accelerates the removal of baseload fossil fuel capacity nationally.[6]
AEMO's 2026 Integrated System Plan Step Change Scenario projects coal remaining in the NEM until 2048 to 2049. This timeline reflects Queensland's energy roadmap and slower closure schedules in New South Wales and Victoria. AEMO cautions that higher operating costs and renewable competition may drive earlier exits than projected.[6]
State and federal governments hold obligations to coal communities under several transition frameworks. The Net Zero Authority identifies the Hunter, Latrobe Valley and Central Queensland as priority regions. Community leaders warn that current transition support funding falls short of the scale these communities require.[8]
Grid Stability and Storage: Managing the Transition
Battery storage has become the critical enabler of renewable energy integration across the NEM. New large-scale battery capacity of 3,796 megawatts and 8,602 megawatt hours entered service from late 2024. Battery dispatch displaced significant volumes of expensive gas generation during critical evening peaks.[1]
AEMO's 2026 Integrated System Plan requires approximately 40 gigawatts of storage nationally by 2050. That total comprises 35 gigawatts of short and medium-duration batteries for daily firming needs. A further 5 gigawatts of long-duration storage will cover extended periods of low renewable generation.[6]
Interconnector capacity linking NEM regions remains a critical constraint on renewable energy distribution. Several transmission projects in AEMO's actionable Integrated System Plan have missed their construction milestones. Infrastructure Australia values the unconstrained national transmission and generation pipeline at $163 billion for 2024 to 2029.[6]
Virtual power plants aggregate distributed household batteries into a dispatchable network resource. Trials by AGL, Simply Energy and the South Australian government have demonstrated grid support potential. Regulatory barriers prevent full dispatch of virtual power plants into the NEM spot market under current frameworks.[9]
CIS Tender 8 results, announced in June 2026, contracted 4.2 gigawatts and 16.1 gigawatt hours of storage. Fifteen successful projects span New South Wales, Queensland, South Australia and Victoria. The tender attracted 76 gigawatts of competing bids, demonstrating strong industry confidence in storage investment.[10]
The NEM experienced significantly reduced high-priced volatility events in Q4 2025 compared with the previous year. Cap returns, representing spot price intervals above $300 per megawatt hour, fell by $74 per megawatt hour. Price volatility in New South Wales in late November and December arose from supply tightness during peak demand periods.[1]
Snowy Hydro 2.0 remains one of the most significant delayed infrastructure projects in the energy transition. Construction challenges have pushed the project's completion timeline well beyond its original 2025 target. The delay leaves a gap in long-duration storage capacity at a critical juncture for the NEM.[6]
Policy Architecture: Federal and State Frameworks
The Capacity Investment Scheme is the federal government's primary mechanism for underwriting the energy transition. Expanded to 40 gigawatts in July 2025, the scheme supports around $73 billion in energy sector investment. Auctions for generation and dispatchable capacity run from 2024 to 2027 across the NEM and WEM.[11]
The CIS operates through revenue underwriting agreements, providing investment certainty for long-term projects. This model shares structural features with the United Kingdom's contract for difference scheme for renewable energy. Australia's CIS places greater emphasis on dispatchable firming capacity alongside renewable generation.[11]
The Safeguard Mechanism, reformed in 2023, imposes declining emissions baselines on major industrial emitters. The mechanism is intended to create financial incentives for industries to shift from gas to grid electricity. Climate analysts argue its current trajectory falls short of driving accelerated industrial electrification at scale.[9]
New South Wales has established three renewable energy zones to guide large-scale wind and solar investment. Victoria's legislation targets 95 percent renewable electricity by 2035 and 300 percent by 2040. South Australia's sustained renewable majority sets the benchmark toward which other states are now progressing.[9]
Queensland's 2025 Energy Roadmap extended the timeline for some coal assets, complicating NEM transition planning. The state faces tension between coal royalty revenues and statutory renewable energy obligations. Queensland's large coal fleet represents the single largest remaining fossil fuel concentration in the NEM.[6]
The Australian Energy Regulator monitors conduct in the NEM's wholesale and retail electricity markets. Questions persist about whether some incumbent generators withheld dispatchable capacity during high-priced intervals. The AER's quarterly retail energy market reviews remain the primary public evidence base for such conduct assessment.[12]
From CIS Tender 9 onward, a First Nations set-aside dedicates capacity for projects with equity sharing agreements. Projects must commit to 5 percent or higher equity or revenue sharing with First Nations communities. The set-aside reflects the First Nations Clean Energy Strategy's commitment to genuine economic participation.[11]
Economic and Social Dimensions: Costs, Benefits and Equity
The Q4 2025 renewable majority delivered an immediate and measurable wholesale price outcome. Average wholesale electricity prices across the NEM fell 44 percent from Q4 2024 to $50 per megawatt hour. The fall represented one of the sharpest single-quarter wholesale price reductions in the NEM's history.[1]
Wholesale price falls translate imperfectly into retail bill reductions under fixed-term household contracts. Households on variable-rate tariffs experienced faster benefit pass-through during the Q4 2025 price fall. Average NEM wholesale prices fell a further 12 percent year-on-year in Q1 2026, sustaining the downward trend.[5]
Energy hardship remains concentrated in regional coal communities facing simultaneous plant closures and job losses. ABS census data identifies postcodes in the Hunter Valley, Latrobe Valley and Bowen Basin as high economic vulnerability areas. The Net Zero Authority identifies these communities as priority regions for coordinated economic transition support.[8]
Australia's unconstrained energy infrastructure pipeline is valued at $163 billion for the five years from 2024 to 2029. The pipeline covers transmission, grid-scale solar, wind and pumped hydro projects across all NEM jurisdictions. Only 24 gigawatts of solar and wind projects will be operational by 2030 under current delivery rates.[6]
First Nations communities in renewable energy zone corridors hold significant land rights across proposed project areas. The CIS tender structure mandates community benefit sharing and requires genuine co-design processes from applicants. CIS Tender 8 projects committed more than $220 million in First Nations benefits across fifteen contracts.[10]
The cost of continued coal operation includes growing carbon liability under the reformed Safeguard Mechanism. Rising maintenance costs and unplanned outages compound coal's economic disadvantage against renewable alternatives. AEMO's modelling confirms renewable energy firmed with storage is the lowest-cost electricity supply option for Australia.[9]
CIS Tender 8 battery projects are forecast to create more than 6,800 jobs across construction and maintenance. Regional communities hosting renewable energy infrastructure receive direct revenue sharing under current tender conditions. These arrangements represent a structural shift from the extractive model that characterised Australia's coal era.[10]
International Dimensions and Future Trajectories
Germany, Spain and Denmark each exceeded 50 percent annual renewable generation by 2023, ahead of Australia's quarterly milestone. These nations benefit from high interconnection density that allows excess renewable energy to flow across borders. Australia's geographic scale and exclusively domestic grid create distinct integration challenges those systems have avoided.[9]
A renewables-majority grid substantially strengthens Australia's green hydrogen export proposition. Green hydrogen, produced by electrolysis powered by renewable electricity, carries zero direct carbon emissions. Australia's announced hydrogen project pipeline is valued at more than $225 billion.[13]
ARENA announced funding in 2025 for two flagship renewable hydrogen projects. The Murchison Green Hydrogen Project in Western Australia and the Hunter Valley Hydrogen Hub are the first Hydrogen Headstart recipients. Both projects receive long-term production credits to support operational costs over a ten-year period.[14]
Japan and South Korea have established formal bilateral hydrogen and clean energy partnerships with Australia. The European Union's Carbon Border Adjustment Mechanism taxes the carbon content of imports from trading partners. A greening electricity grid reduces the embodied emissions in Australian exports, improving competitiveness under that mechanism.[15]
AEMO projects a 422 percent increase in grid-scale wind and solar capacity is required by 2050. Total NEM generation and storage capacity must triple from 82 gigawatts today to 297 gigawatts by 2050. Achieving that trajectory requires approximately 6,000 kilometres of new transmission infrastructure across the NEM.[6]
Transmission planning approvals and construction timelines represent a systemic risk to the energy transition. Social licence challenges in renewable energy zones continue to delay project delivery in several states. The mismatch between the renewable generation pipeline and approved transmission capacity widens with each passing year.[6]
In the first half of 2025, renewables globally surpassed coal in electricity generation for the first time. Australia's NEM milestone aligns with that global trajectory while confronting distinctive structural challenges. Accelerating grid-scale storage deployment and resolving transmission bottlenecks remain the defining tasks of the next decade.[9]
Australia's Q4 2025 renewable majority represents a genuine structural turning point in the nation's electricity history. Sustained investment in wind, solar and battery technology drove a transition that arrived ahead of most central projections. The electricity system that powered Australia's industrial economy for a century is being fundamentally remade.
The transition exposes serious governance gaps. Coal communities in the Hunter Valley, Latrobe Valley and Bowen Basin face accelerating dislocation. Australia requires a national coal exit framework to coordinate the orderly retirement of remaining capacity.
Grid infrastructure lags behind generation investment, threatening delivery of Australia's 82 percent renewable target by 2030. Transmission bottlenecks and delayed interconnector projects limit the full value of the renewable energy already installed. Resolving these constraints demands institutional urgency beyond what current planning frameworks have achieved.
The milestone is meaningful but the transition remains unfinished. How Australia manages coal exits and shares renewable wealth will determine whether outcomes are equitable. Political will must now match the scale of the task.
References
1. Quarterly Energy Dynamics Q4 2025. AEMO's authoritative quarterly market analysis confirming renewables and storage exceeded 50 percent of NEM supply for the first time, with detailed generation, price and storage data.
2. Renewables Supply More Than Half of Quarterly Energy Supply. AEMO's official media release on Q4 2025 outcomes, confirming the historic renewable majority across the NEM and corresponding records in Western Australia's WEM.
3. Quarterly Energy Dynamics Q3 2025. AEMO's Q3 2025 Quarterly Energy Dynamics report, documenting records in variable renewable energy output and South Australia's 98.7 percent renewable generation in September 2025.
4. Power Surge: Renewable Energy Hits Record High as Coal Splutters. Climate Council analysis of AEMO's Q1 2025 data, documenting record renewable generation, battery output and the ongoing decline of coal-fired generation availability.
5. Australia's Energy Transition Gathers Pace. Australian Government media release covering Q1 2026 energy market outcomes, including a new Q1 renewable energy record of 46.5 percent and a 12 percent year-on-year fall in wholesale prices.
6. Renewable Generation. Infrastructure Australia's analysis of Australia's renewable energy infrastructure pipeline, AEMO's 2026 Draft Integrated System Plan projections, and generation and storage capacity requirements to 2050.
7. Farewell Liddell: What to Expect When One of Australia's Oldest Coal Plants Closes. Climate Council analysis of the Liddell power station closure, AGL's coal fleet transition obligations and the reliability challenges facing the NEM as coal capacity retires.
8. Enabling the Transition. Australian Government Net Zero Authority framework, identifying priority regions for just transition support including the Hunter Valley, Latrobe Valley and Central Queensland.
9. An Aussie Roadmap: Building a Clean, Reliable and Low-Cost Electricity Grid. Climate Council's roadmap for Australia's electricity grid, covering AEMO's Integrated System Plan, the economics of renewable energy firmed with storage, and state and federal policy settings.
10. Australia Awards 4.2GW/16.1GWh of Battery Storage Under Capacity Investment Scheme Tender 8. Detailed reporting on CIS Tender 8 outcomes, including contracted storage capacity, First Nations benefit commitments and job creation forecasts across fifteen successful projects.
11. Capacity Investment Scheme. Australian Government's Capacity Investment Scheme program page, detailing the 40 gigawatt target, $73 billion investment support and First Nations equity set-aside provisions from Tender 9 onward.
12. Electricity Generation. Australian Government's official Australian Energy Statistics on electricity generation by fuel source, confirming on-grid renewables reaching 42 percent in calendar year 2025.
13. Growing Australia's Hydrogen Industry. Australian Government DCCEEW page on growing Australia's hydrogen industry, covering the 2024 National Hydrogen Strategy, ARENA funding commitments and the Guarantee of Origin certification scheme.
14. Hydrogen Energy. ARENA's renewable hydrogen program page, detailing the Hydrogen Headstart initiative and 2025 funding announcements for the Murchison Green Hydrogen Project and Hunter Valley Hydrogen Hub.
15. Australia's International Climate and Clean Energy Partnerships. Australian Government DCCEEW page covering bilateral clean energy partnerships with Japan, South Korea and the European Union, and the Carbon Border Adjustment Mechanism context for Australian exports.
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