When discussing the green transition, the sun and the wind almost always take center stage. They are visible, recognizable, and easy-to-understand symbols of change. Solar panels on rooftops and wind turbines on the horizon send a clear message that the energy system is moving away from fossil fuels. Yet this picture is incomplete. The energy system of the future cannot rely solely on sources that depend on weather conditions and natural cycles.
The sun does not produce energy at night, and the wind does not always blow when demand is at its highest. These are not shortcomings, but objective physical facts. The problem arises when intermittent sources are expected to carry the burden of a system that must operate continuously. The energy of the future, therefore, is not about choosing a single “greenest” source, but about intelligently combining different solutions into a stable whole.
In such a system, an important role is played by sources that can operate continuously. Hydropower, where natural conditions allow, has fulfilled this role for decades by providing relatively stable and predictable production. Geothermal energy, although less visible in public debates, offers a similar advantage: it does not depend on the weather and is available throughout the year, making it extremely valuable for long-term planning.
A special role is also played by energy from biomass and biogas. Organic waste from agriculture, forestry, and everyday life contains energy that can be deliberately harnessed. Unlike the sun and the wind, these sources can be controlled and adjusted to the needs of the system. They link energy issues with waste management and rural development, making them beneficial on multiple levels.
Another often overlooked element is systems that convert the unavoidable remainder of waste into energy. This is not about replacing recycling, but about complementing it. In every society, there is a portion of waste that cannot be materially recycled. Instead of ending up in landfills, this residual waste can serve as a stable energy source, simultaneously reducing waste volumes and contributing to security of supply.
The role of energy storage and smart grids should not be overlooked either. Batteries, thermal storage, and flexible consumption systems make it possible to use energy produced from intermittent sources when it is most needed. They do not generate energy themselves, but they are essential for connecting different sources into a functional system.
The energy of the future, therefore, is not a simple story with two main characters. It is a complex mosaic in which each source has its role. The sun and the wind are important, but without stable, controllable, and complementary sources, the system remains unbalanced and vulnerable. Sustainability is not measured only by the cleanliness of sources, but by the system’s ability to reliably meet the needs of society.
A true energy transition begins when we stop searching for a single solution to all problems. Only when we embrace the diversity of sources and their interconnection can we speak of the energy of the future as a realistic, rather than an idealized, concept. In this sense, the sun and the wind are the beginning of the story—but by no means its end.
