As the consequences of climate change become ever more apparent, investments in renewable energy are seen as crucial to safeguarding the future of the planet.
Renewable sources, including wind, solar and hydroelectric, currently account for about a quarter of global electricity generation – a proportion that is set to increase as part of efforts to decarbonise.
However, the sector still suffers from constraints. The most common criticism of renewables is reliability because output fluctuates according to, for example, the time of day, the weather and, in the case of hydroelectric power, seasonal river flows.
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