The way the world produces electricity is changing.
For generations, coal, oil and natural gas powered homes, factories, transport and economic growth. These fuels helped build the modern world, but burning them also releases greenhouse gases and air pollutants. Today, countries are increasingly adding cleaner sources of energy to their electricity systems.
Solar panels now appear on everything from suburban rooftops to enormous solar farms. Wind turbines generate electricity both on land and offshore. Hydropower continues to supply large amounts of renewable electricity, while battery storage is making it easier to use solar and wind power when the sun isn’t shining or the wind isn’t blowing.
This isn’t simply a vision of what might happen decades from now. The transition is already well underway. Renewables supplied around 34% of global electricity in 2025, and renewable generation was virtually level with coal generation worldwide. IEA
What Is Green Energy?
Green energy generally refers to energy produced from sources that have a much lower environmental impact than conventional fossil fuels.
The main renewable sources include solar, wind, hydropower, geothermal energy and sustainably produced forms of bioenergy.
Unlike coal, oil and natural gas, renewable resources can be naturally replenished. Sunlight returns each day, winds continue to blow and water continues through the natural water cycle.
Renewable doesn’t automatically mean impact-free. Solar farms require land and materials, wind turbines require manufacturing and infrastructure, hydropower can alter river ecosystems, and batteries require minerals that must be extracted and processed.
The important difference is that these technologies can generate energy without continually burning fossil fuels.
Renewable Energy Is Growing Rapidly
One of the clearest indications of change is simply how much renewable generating capacity is being built.
According to the International Renewable Energy Agency, 692 gigawatts of renewable power capacity were added during 2025. Renewables accounted for 85.6% of all new power capacity added worldwide that year. IRENA
Solar has become particularly important. The International Energy Agency reported that solar PV accounted for more than three-quarters of new renewable capacity additions in 2025. IEA
This doesn’t mean fossil fuels have disappeared. Coal and natural gas remain major parts of the world’s energy system, and the energy mix differs considerably from one country to another.
But the direction of investment and new electricity capacity has shifted substantially towards renewables.
Why Solar Energy Has Become So Important
Solar power has one enormous advantage: it can be used at vastly different scales.
A small solar system can provide electricity to an isolated home. Rooftop panels can reduce the amount of electricity a household or business draws from the grid. At the other end of the scale, enormous solar farms can supply electricity to hundreds of thousands of consumers.
Solar panels also have no moving parts while generating electricity, which can make them relatively straightforward to operate and maintain.
The technology still has an obvious limitation — solar panels don’t generate electricity at night and their output changes with weather conditions.
That is why solar increasingly works as part of a larger system involving electricity grids, other generation sources, energy storage and smarter management of when electricity is consumed.
Wind and Hydropower Remain Major Players
Wind energy has also grown into a major source of renewable electricity.
Modern wind turbines convert the movement of air into electricity, and wind farms can contain anything from a handful of turbines to enormous offshore developments.
Hydropower works differently. Moving or falling water drives turbines that generate electricity. It remains the world’s largest individual source of renewable electricity generation, although solar and wind are expanding rapidly. IEA
Geothermal energy, bioenergy and emerging technologies such as marine energy add further diversity.
There isn’t one renewable technology capable of solving every energy problem. Different countries and regions have different resources, climates, geography and electricity needs.
Batteries Are Changing What Renewables Can Do
One of the traditional challenges for solar and wind is variability.
Electricity demand doesn’t conveniently rise and fall according to sunshine and wind conditions.
Energy storage helps bridge that gap.
A battery can store electricity when production is high and release it later when electricity is needed. At household scale, this might mean storing excess rooftop solar during the afternoon and using it after sunset.
At grid scale, batteries can respond rapidly to changing electricity supply and demand.
Battery storage is expanding quickly. The IEA reported that almost 110 GW of battery storage capacity was added globally during 2025, an increase of around 40% from the previous year. IEA
Storage isn’t the only answer to renewable variability. Strong transmission networks, flexible generation, demand management and better connections between regions all play a role.
Cleaner Energy Can Also Mean Cleaner Air
Climate change is a major reason for moving away from fossil fuels, but it isn’t the only one.
Burning coal, oil and gas can produce air pollutants as well as carbon dioxide.
Wind turbines and solar panels generate electricity without combustion. Replacing some fossil-fuel generation with these technologies can therefore reduce emissions associated with electricity production.
Clean-energy technology already has a measurable effect. The IEA estimates that deployment of solar, wind, nuclear power, electric cars and heat pumps since 2019 was avoiding around three billion tonnes of carbon dioxide emissions annually by 2025. IEA
The Electricity Grid Must Change Too
Building more solar panels and wind turbines is only part of the transition.
Electricity grids were largely designed around predictable power stations generating electricity and sending it towards consumers.
Modern energy systems are becoming far more complicated.
Electricity can now flow from rooftop solar systems as well as large power stations. Batteries can switch between consuming and supplying electricity. Electric vehicles create substantial new demand but may also eventually provide useful storage. Large renewable projects can be located far from the cities that need their electricity.
Transmission lines, distribution networks, smart meters, storage and grid-management technology therefore matter almost as much as the generators themselves.
As renewable generation expands, the IEA says grid expansion, modernisation and greater system flexibility will be critical to integrating larger amounts of solar and wind power. IEA
There Are Still Real Challenges
Green energy isn’t a magic solution.
Renewable projects can face community opposition, environmental concerns, long approval processes and delays connecting to electricity grids.
Solar panels, wind turbines and batteries also require raw materials and eventually reach the end of their working lives. Recycling, responsible mining and better product design will become increasingly important as clean-energy technologies expand.
Cost can also vary dramatically between countries and individual projects.
And electricity systems still need reliable power when renewable generation is low.
These aren’t reasons to dismiss renewable energy. They are engineering, environmental, economic and policy problems that need to be addressed as energy systems evolve.
What Does the Future Look Like?
The International Energy Agency expects global renewable power capacity to increase by around 4,600 GW between 2025 and 2030, with solar PV accounting for almost 80% of that expansion. IEA
That doesn’t mean every country will follow the same path or move at the same speed.
Some will rely heavily on solar. Others have exceptional wind, hydropower or geothermal resources. Many will use a mixture of technologies alongside storage, stronger electricity grids and other low-emission sources.
What appears increasingly clear is that renewable energy is moving from the edges of the electricity system towards its centre.
A Cleaner Energy Future
The future of energy isn’t likely to depend on one miraculous invention.
It will come from thousands of improvements working together: better solar panels, larger and more efficient wind turbines, improved batteries, stronger electricity grids, smarter homes and businesses, cleaner transport and technologies that haven’t yet reached widespread use.
The transition won’t happen overnight, and it won’t be without difficulties.
But green energy is no longer simply an alternative to the traditional energy system.
Increasingly, it is becoming part of the system itself.
