IEA outlook reveals urgent need for grid upgrades to accelerate clean power transition by 2030

The International Energy Agency’s latest outlook sketches a power sector in transition but not yet transformed: by 2030 roughly half of global electricity supply will be drawn from low‑emission sources , principally renewables and nuclear , yet coal and gas will still supply a substantial share of generation and remain operationally central in many countries.

According to the IEA’s World Energy Outlook 2023, renewable output is set to expand rapidly, adding about 1,000 terawatt‑hours a year through to 2030, with solar responsible for more than 60% of that gain. That pace corresponds to average annual growth in renewable generation of about 8% across the forecast period. In aggregate the IEA projects global electricity consumption to rise from roughly 28,200 TWh in 2025 to around 33,600 TWh in 2030, an increase driven primarily by emerging markets and industry, and amplified by the rapid deployment of data centres and other digital infrastructure.

The geography of demand growth is concentrated. Emerging economies will account for more than 80% of the additional consumption to 2030, and China alone is expected to supply close to half of the incremental demand. The industrial sector , including manufacturing of solar panels and batteries , is the leading driver, while advanced economies are also returning to demand growth after a long plateau, in part because data centre expansion is now a major new load. The IEA notes that, in the United States, data centres are forecast to represent around half of electricity demand growth through to 2030.

Despite the heavy renewable additions, fossil fuels do not disappear. Globally coal remains the single largest source of electricity today, and while its share is forecast to decline , from about 34% now to roughly 27% by 2030 , the pace of reduction varies markedly across regions. The IEA projects coal‑fired output to fall on average by 0.9% per year from 2026–2030. Advanced economies are shifting faster: the United States is expected to see coal generation decline at about 6% per year over that window, and the European Union at around 16% per year. By contrast, China’s coal generation is projected to decrease only marginally , about 0.5% per year , even as its overall coal share falls from near 55% to about 43% because of rapid growth in other sources. India’s electricity system will remain heavily coal dependent, with coal still supplying more than 60% of power in 2030 despite an average annual reduction in coal output of roughly 2.3%.

Carbon intensity of electricity is falling, and the IEA expects that decline to accelerate. After reductions of 2.6% in 2024 and 3.0% in 2025, the agency projects an average annual drop of 3.7% between 2026 and 2030 , approaching a near‑20% fall in carbon intensity by 2030 relative to today’s levels. The EU emerges as a standout in the model, with a steep annual reduction trajectory that would halve its carbon intensity by 2030. China will contribute materially to global decarbonisation in absolute terms: the IEA’s pathway implies China reducing average emissions intensity of electricity from around 530 gCO2/kWh to about 415 gCO2/kWh by 2030. India and parts of Southeast Asia record slower progress, with India’s intensity falling to roughly 585 gCO2/kWh by 2030 and Southeast Asia’s remaining comparatively high.

But technical progress on generation is colliding with system‑level constraints. The IEA highlights that, as of 2025, about 1,700 GW of renewable projects and more than 600 GW of battery storage schemes were queued for grid connection in advanced stages of development. At least 150 GW of planned data‑centre capacity faced the same bottlenecks. Those queues reflect underinvestment and limited capacity in transmission and distribution networks, and the mismatch is already driving higher rates of curtailment , the forced shedding of otherwise available low‑carbon output. Chile reported around 15% curtailment of wind and solar in 2024, the highest level since 2017, illustrating how rapid VRE deployment without commensurate grid upgrades can blunt the climate benefits of new capacity.

Industry and system planners face two linked imperatives. First, the IEA’s scenarios imply that renewables, gas and nuclear together can meet the world’s additional electricity needs through 2030, but the balance is sensitive to deployment rates. In the EU the modelling shows renewables meeting all demand growth to 2030, with solar accounting for more than 70% of added capacity between 2025 and 2030. In contrast, in the United States, Southeast Asia and India the share of renewables in total generation is expected to reach only about 20–30% by 2030 under current trajectories, meaning fossil fuels will be needed alongside renewables to meet surging demand.

Second, grid investment must rise rapidly if additional low‑emission capacity is to deliver usable power. The IEA calculates that annual spending on networks would need to increase by around 50% by 2030 to avoid persistent curtailment and connection delays. Without that scaling of transmission, distribution and system flexibility , including storage, smarter grid control and regulatory reform to speed connections , countries risk wasting renewables, prolonging reliance on thermal plants to balance the system, and undermining the economics of clean‑energy projects.

For industrial decarbonisation stakeholders the message is practical: accelerating renewables build alone will not secure emissions declines at scale. Policymakers and utilities must synchronise generation rollout with targeted grid upgrades, market rules that reward flexibility, and planning that anticipates concentrated loads such as data centres and battery industrial parks. The IEA’s outlook shows that the technical potential to deliver a much cleaner power mix by 2030 exists, but realising it will require coordinated investment and policy action to resolve bottlenecks that currently risk converting low‑emission capacity into unused potential.