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Solar is driving most new renewable capacity, but the shift in global power depends on more than building panels and turbines. Battery storage, grid connections, investment, policy and the uneven spread of projects will help determine how much clean electricity reaches consumers. The latest reported figures describe 2025; projections for 2026 and 2030 are forecasts, not final results.
1. Solar is supplying most of the new renewable capacity
The International Energy Agency (IEA) estimates that the world added 800 GW of renewable capacity in 2025. Solar photovoltaic (PV) supplied more than three-quarters of those additions, making it the clear driver of new renewable build-out. By the end of 2025, cumulative solar PV capacity was about 2,800 GW.
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Capacity measures the potential output of installed equipment, not the electricity it actually generates. A solar project’s production varies with sunlight, location and system conditions, so capacity figures alone do not show how much power it delivered.
2. Solar is changing the electricity growth picture
Solar’s influence shows up in both energy demand and electricity generation, but those are different measures. The IEA says solar met more than one-quarter of the growth in global primary energy demand in 2025. For electricity generation, the IEA records a 600 TWh annual increase in solar output, while Ember reports a 636 TWh increase in its dataset. These figures should be read as separate estimates from different publishers, not averaged into a single total.
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Rising electricity use makes the generation mix especially important. The IEA forecasts global electricity demand growth of 3.6% in 2026 and 3.8% in 2027. Those are forecasts, not confirmed growth rates; they indicate the scale of the demand that new generation and grid infrastructure will need to serve.
3. Wind additions rebounded, while weather shaped generation
Wind capacity additions also grew in 2025. The IEA estimates that around 160 GW was added worldwide, almost 40% more than in 2024. But new capacity and electricity output do not move in lockstep: wind generation rose about 8%, with poor wind conditions in major markets limiting output.
That distinction matters when comparing technologies. An annual addition of capacity describes new equipment; generation measures electricity produced over time. Weather can change generation even when the installed fleet is larger.
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4. Renewables reached a generation milestone, but the accounting differs
Ember’s accounting puts renewables at 33.8% of global electricity generation in 2025, ahead of coal at 33.0%. The IEA’s latest available data for its comparison says renewable output virtually matched coal instead. The agencies’ different results reflect differences in datasets, definitions, estimation methods and update timing, so neither figure should be presented as if all publishers reported the same share.
The IEA’s mid-year update forecasts that renewables will overtake coal in 2026. That is a forecast, not a completed full-year 2026 result. More broadly, a higher renewable share does not mean coal has disappeared: it means renewables account for a larger portion of total electricity generation under the stated accounting.
5. Batteries are beginning to move solar power into later hours
Solar generation is concentrated in daylight hours, while electricity demand continues after sunset. Ember estimates that battery deployment reached 250 GWh in 2025, up 46% from the previous year. It estimates that installed battery capacity could shift 14% of new solar generation from midday to other hours.
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That potential is useful, but it is not a claim that batteries store all excess solar power or eliminate variability. Storage shifts electricity across time; grids still need to connect generators and users, balance supply and demand, and handle periods when renewable output is low.
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6. Grid queues are keeping projects from becoming delivered power
Projects can be planned, financed or even built yet still wait for permission and infrastructure to connect to the electricity system. The IEA reports more than 2,500 GW of renewable, storage and large-load projects stalled in connection queues worldwide. That queue is a pipeline of proposed projects, not a measure of capacity already operating or guaranteed to be built.
The IEA estimates that a combination of flexible connection agreements and grid-enhancing technologies could unlock 1,200–1,600 GW of advanced-stage projects. The estimate concerns projects further along in development; it does not mean every queued project will connect or that grid upgrades are unnecessary.
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7. Transmission investment and smarter network use need to catch up
The IEA says annual grid investment would need to rise by roughly 50% by 2030 from USD 400 billion today to meet forecast demand. This is an investment need, not a report that the increase has already occurred. New transmission can carry power across greater distances, while improved use of existing lines can ease some bottlenecks sooner.
- Flexible connection agreements can allow a project to connect under operating conditions that vary with grid capacity, rather than requiring the network to accommodate its full output at all times.
- Dynamic line ratings adjust estimates of how much electricity a line can safely carry to reflect changing conditions.
- Power-flow controls can direct electricity through available network paths more effectively.
These measures can make better use of existing infrastructure, but they do not remove the need for sufficient transmission investment as electricity demand grows.
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Where capacity is added matters as well as how much is added. The IEA estimates that China installed nearly 500 GW of renewable capacity in 2025, accounting for more than 60% of global growth by its measure. IRENA’s separate statistics put China, the United States and the European Union together at 79.5% of renewable capacity additions; Africa represented 1.6% in that accounting.
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The organizations report different global totals for 2025, so these regional figures should be understood within each agency’s own dataset rather than combined as if they shared one methodology.
| Publisher and measure | Reported 2025 result |
|---|---|
| IEA: global renewable capacity additions | 800 GW |
| IRENA: global renewable capacity additions | 692 GW |
| IRENA: share of global power additions that were renewable | 85.6% |
The 800 GW and 692 GW totals are not interchangeable estimates to average together. Their difference reflects distinct datasets, definitions, estimation methods and update timing.
9. Policy and market design can quickly change project economics
Renewable projects depend on the rules that determine how power is sold, which incentives are available and how permits and grid connections are handled. The IEA describes China’s move from fixed tariffs to competitive auctions, a change in how projects compete for support and revenue. It also says changes to US tax incentives, restrictions and permitting affected its outlook for renewable deployment there.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteThese are jurisdiction-specific developments, not evidence of one global policy direction. An auction, incentive or permitting change can alter the expected economics and timeline of projects in the affected market, but the effect cannot be assumed to apply everywhere.
10. The 2030 tripling ambition remains ahead of the IEA’s main case
The IEA’s main case projects cumulative global renewable capacity of 9,530 GW by 2030. The capacity corresponding to tripling 2022 levels is about 11,500 GW, leaving the main-case projection below that ambition. The IEA’s accelerated case reaches more than 10,400 GW if barriers are addressed, but it too remains below the tripling level stated in the comparison.
These are scenario projections, not confirmed 2030 outcomes. Their practical message is that strong additions do not, by themselves, guarantee the tripling goal: deployment, grid access, investment and policy conditions all shape the path.
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