The researchers said that most of the current demand for electricity in developed industrial countries can be met by wind and solar energy. However, in order to fully meet the requirements of the countries, additional efforts will have to be made.
According to the study, the most reliable systems, which are dominated by wind energy, are able to meet the electricity needs of countries 72-91% of the time, even without energy storage. With the addition of a 12-hour energy reserve, such systems meet demand 83-94% of the time. At the same time, huge reserves and excess generating capacities are not needed.
The scientists also noted that a complete transition to alternative energy sources may be easier for larger countries at lower latitudes, which can rely on the sun all year round.