2025 Global Energy Transition Highlights: Solar and Wind Power Lead Power System Transformation

2025 Global Energy Transition Highlights: Solar and Wind Lead Power System Transformation

Introduction: 2025 marks a milestone in the global energy transition. The latest analysis by energy think tank Ember shows that solar and wind have, for the first time, exceeded global electricity demand growth over a sustained period, and renewable electricity generation has surpassed coal for the first time. Meanwhile, plunging battery costs are making "24/7 solar" a reality. The rise of China as an "electric nation" and accelerated development in emerging markets are reshaping the global energy landscape. This article reviews the key highlights of the global energy transition in 2025 and looks ahead to future trends.

Industry Background

Over the past decade, the global power system has been undergoing profound transformation. Solar and wind installed capacity has continued to expand rapidly, with costs declining steadily, making them the most economical source of new power capacity. Data from the International Energy Agency and other institutions shows that the share of renewables in the global power mix is rising steadily. However, 2025 is a landmark year.

Ember data shows that in the first three quarters of 2025, solar and wind together supplied 17.6% of global electricity, up from 15.2% in the same period of 2024. Adding hydropower and other low-carbon sources, low-carbon electricity accounted for 43%. Even more notably, renewable electricity generation (including solar, wind, hydropower, etc.) exceeded coal for the first time over a sustained period. The core driver of this shift is solar—the growth in solar generation in 2025 was more than three times that of any other power source, confirming its dominant role in reshaping the global power system.

Global renewable capacity additions are also accelerating. Ember projects that the world will add 793 GW of renewable capacity in 2025, an 11% increase from 717 GW in 2024. At this pace, as long as annual new installations maintain moderate growth, the world is on track to achieve the goal of tripling renewable capacity by 2030.

Current Developments

Solar and Wind Outpace Demand Growth

A report released by Ember in November 2025 shows that the pace of solar and wind expansion is now sufficient to meet all additional global electricity demand. This is no longer about "catching up" with demand but "surpassing" it. This turning point means clean electricity is leading the direction of the global energy system. In the past, new electricity demand was typically met by fossil fuels; that logic has now changed.

Emerging Markets Accelerate

In 2025, solar energy started to take off in markets that have long lagged behind. Africa stood out: in the 12 months to June 2025, China's solar panel exports to Africa grew by 60%, with total imports reaching 15 GW, compared with 9.4 GW a year earlier. South Africa remains the largest buyer, and 20 other countries set import records. Algeria's imports grew 33-fold, Zambia 8-fold, Botswana 7-fold, and Sudan 6-fold, while Liberia, the Democratic Republic of the Congo, Benin, Angola, and Ethiopia also more than doubled.Central Europe is also showing strong momentum. In June 2025, solar power accounted for more than 40% of electricity generation in Hungary, while Poland and the Czech Republic also set new monthly solar power records.

BRICS countries have become the center of global solar power generation. In 2024, the ten BRICS countries together accounted for 51% of global solar power generation, compared with just 15% a decade earlier. This shows that the center of gravity of the global energy transition has clearly shifted eastward.

Milestones in Major Economies

Several major economies set new records in 2025. In August, Brazil's wind and solar generation exceeded one-third of electricity demand in a single month for the first time. In June, solar became the largest single source of electricity in the European Union. In Spain, the expansion of wind and solar has weakened fossil fuel generators' pricing power by 75% since 2019. In September, the UK's wind and solar generation exceeded half of its total electricity generation for the first time. Solar has also become the largest source of electricity in California. In India, an Ember analysis in October pointed out that, as long as solar, wind, and storage targets are met, India does not need to build new coal power capacity beyond its National Electricity Plan 2032.

These cases show that once clean electricity reaches a certain share, it begins to set electricity prices, weakens the influence of expensive fossil fuel generation, and reduces dependence on energy imports. The former "growth story" is now simultaneously changing market dynamics, affordability, and energy security.

The Electrotech Revolution Accelerates

In 2025, efficient electric technologies—represented by solar, wind, batteries, electric vehicles, and heat pumps—became the main driver of global energy growth. Solar installed capacity has roughly doubled every three years over the past 30 years; battery storage has nearly doubled every year since 2020; and electric vehicle sales have grown fifteen-fold since 2017, reaching 17.5 million units.

China, the world's first "electric nation," is leading this transition. China accounts for half of global solar panel installations, 60% of electric vehicle sales, and two-thirds of global electricity demand growth since 2019. In the first half of 2025, fossil fuel demand in China's electricity sector fell by 2%. From Vietnam to Mexico, from South Africa to India, emerging markets are surpassing the United States in solar power share. Mastering the electric technology stack—batteries, motors, and power electronics—is now crucial for industrial growth, employment, and strategic autonomy.

Battery Cost Declines Bring 24/7 Solar

The sharp decline in battery costs and rapid deployment are making solar a nearly around-the-clock reliable power source. An Ember analysis from June 2025 shows that in regions with high solar irradiance, solar paired with batteries can provide 24/7 electricity at a cost of about $104 per megawatt-hour, lower than new coal and nuclear power, making "solar as baseload power" both technically and economically viable.Mexico is one of the potential beneficiaries. Falling battery prices can unlock tens of gigawatts of new solar power and reduce dependence on imported fossil fuels. Ember estimates that Mexico could avoid about $1.6 billion in annual natural gas import expenditures. Heavy industry in India is also exploring new opportunities: by combining solar, wind, and energy storage, large industrial consumers can meet 80% of their annual electricity demand at costs comparable to or even lower than coal power.

Batteries have also become a versatile tool for the power sector. In addition to storing surplus renewable energy, they can provide key grid services such as fast frequency response and black start capability, enhancing system reliability.

Clean electricity becomes the foundation of global AI competition

The growth of artificial intelligence and data centers has become one of the most closely watched energy issues in 2025. Countries and companies that can meet growing electricity demand will gain an advantage in technological competition. Clean electricity has become a new source of competitiveness for modern economies. Data centers are increasingly being located in regions with abundant renewable energy and strong power grids.

Impact on energy systems

The developments described above have had a profound impact on global energy systems.

A fundamental shift in the energy supply structure: Solar and wind are no longer "supplementary" energy sources but the mainstay of new electricity supply. Renewables surpassing coal marks a new stage in the global power system.

Enhanced energy security: By reducing dependence on imported fossil fuels, especially in countries like Spain and Mexico, clean electricity has improved energy autonomy. Distributed solar and battery storage have also strengthened grid resilience.

Lower electricity costs: The marginal cost of renewables is nearly zero, and large-scale deployment has pushed down wholesale electricity prices. Spain's experience shows that wind and solar have significantly weakened the pricing power of gas-fired generation, thereby reducing overall electricity costs.

New challenges for grid stability, but also new solutions: A high share of variable power sources requires a more flexible grid. Technologies such as battery storage, smart grids, and demand response are becoming key to maintaining stability. In addition to storing energy, batteries provide ancillary services such as frequency regulation, demonstrating their multi-functional value.

Restructuring of the industrial chain: The development of electrotech has driven growth in manufacturing sectors such as batteries, electric vehicles, and power electronics. China's dominant position in the supply chain has drawn attention to supply chain security in various countries and also promoted regionalized manufacturing layouts.

Accelerated carbon reduction: The power sector is one of the main sources of global carbon emissions. The rising share of clean electricity directly advances the decarbonization process. Renewables surpassing coal means a significant decline in the carbon intensity of the power sector.

Challenges ahead

Despite significant progress, the global energy transition still faces multiple challenges.

Energy storage deployment still needs to accelerate: Although battery costs are falling rapidly, there remains a huge gap in storage capacity to ensure stable supply with a high share of renewables. Especially in the field of long-duration energy storage, technological maturity and costs still need improvement.Grid infrastructure lags behind: In many regions, transmission networks cannot adapt to the rapid growth of renewable energy. Grid connection queues and insufficient transmission capacity have become major factors in project delays. Strengthening grid upgrades and cross-regional interconnection is an urgent priority.

Project financing pressure: Renewable energy projects in emerging markets often face high financing costs and difficulty in accessing capital. Although global green investment is growing, capital allocation is uneven, and parts of Africa and South Asia still need substantial support.

Policy uncertainty: Policy swings in some countries, subsidy phase-downs, or regulatory changes may affect investor confidence. A stable policy framework is key to ensuring the continued expansion of renewable energy.

Raw material supply chain risks: Batteries and photovoltaic modules depend on critical minerals such as lithium, cobalt, and rare earths. Supply chain concentration and price volatility may constrain the speed of technology deployment.

Uneven technology maturity: Although solar and wind energy have matured, key technologies such as long-duration energy storage and green hydrogen are still in the early stages and require further R&D and demonstration.

Future Outlook

Looking ahead 5 to 20 years, the global energy transition will enter an acceleration phase.

Energy mix changes: Solar and wind will continue to be the mainstay of new installed capacity. As battery costs decline further, "solar + storage" is expected to become a baseload power source in many regions. By 2030, the share of renewable energy in power generation may rise significantly. Although the global goal of tripling renewable energy is challenging, it is not out of reach given current trends.

Investment trends: Clean energy investment will continue to grow, especially in key technologies such as batteries, grids, and electrolyzers. ESG capital will place greater emphasis on actual emission reduction outcomes. Emerging markets are expected to attract more investment, driven especially by policy improvements and falling costs.

Technology development directions: Battery technologies (including sodium-ion, solid-state batteries, etc.) will continue to advance, and long-duration energy storage, green hydrogen, and smart grid technologies will gradually mature. Electrification will further expand into transportation, buildings, and industry. The integration of AI with energy systems will improve efficiency but also bring new electricity demand.

Global energy competition landscape: Electrotech capabilities will become the core of national competitiveness. China's leading position in manufacturing and deployment may continue, but other countries are also actively catching up, forming a multipolar landscape. Energy geopolitics will shift from fossil fuels to critical minerals and technology supply chains.

Policy and market design: Countries will push forward electricity market reforms to accommodate a high share of renewable energy. Mechanisms such as capacity markets, ancillary services markets, and real-time electricity pricing will be improved. Policies such as carbon pricing and green hydrogen certification will be accelerated and expanded.

In summary, 2025 has demonstrated that the global energy transition is no longer a distant vision, but an ongoing systemic transformation. Clean electricity has become the dominant force in global energy growth. In the future, countries that seize opportunities and address challenges will gain an advantage in economic and geopolitical competition.