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Whether rooftop solar panels are worth the cost is largely dependent in Switzerland on local compensation rates for solar power and on electricity prices in general – these are the findings of a study by researchers at ETH Zurich and the University of Bern. Many power grid operators pay too little, thereby limiting the expansion of solar power.

Patchwork of issues limits solar expansion

Solar power is becoming an increasingly important source of energy worldwide. At present, photovoltaic systems are predominantly being used in Germany. For sunny countries, solar tower power plants are a valuable addition. They store heat and can generate electricity at any time – even when the sun is not shining.

Solar tower power plants - sunlight becomes electricity on demand

EPFL chemical engineers have invented a solar-powered artificial leaf, built on a novel electrode which is transparent and porous, capable of harvesting water from the air for conversion into hydrogen fuel. The semiconductor-based technology is scalable and easy to prepare.

A step towards solar fuels out of thin air

Concentrating solar thermal systems are still little known in Germany, although they are a highly efficient approach to producing heat from solar energy. In such a system, specialised mirrors arranged in different geometries are used to focus the Sun’s rays on a defined area, such as a circle or a line. This heats a heat transfer medium, which then flows through a heat exchanger.

Concentrating solar thermal technology ready for efficient use in Germany

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