![]() ![]() Several key terms are useful for understanding the issue of intermittent power sources. Though power grids are already designed to have some capacity in excess of projected peak demand to deal with these problems, significant upgrades may be required to accommodate large amounts of intermittent power. Existing power grids already contain elements of uncertainty including sudden and large changes in demand and unforeseen power plant failures. Matching power demand to supply is not a problem specific to intermittent power sources. Smaller isolated grids may be less tolerant to high levels of penetration. Solutions include energy storage, demand response, availability of overcapacity and sector coupling. These, along with renewables typically being asynchronous generators, provide a challenge to grid operators, who must make sure supply and demand are matched. Characteristics of variable renewables include their unpredictability, variability, and low operating costs. However, in 2021 Denmark, Luxembourg and Uruguay generated over 40% of their electricity from wind and solar. The penetration of intermittent renewables in most power grids is low: global electricity generation in 2021 was 7% wind and 4% solar. More connections between the energy sector and the building, transport and industrial sectors may also help. Options to absorb large shares of variable energy into the grid include using storage, improved interconnection between different variable sources to smooth out supply, using dispatchable energy sources such as hydroelectricity and having overcapacity, so that sufficient energy is produced even when weather is less favourable. Using larger amounts of intermittent power may require upgrades or even a redesign of the grid infrastructure. ![]() The use of small amounts of intermittent power has little effect on grid operations. Variable renewable energy ( VRE) or intermittent renewable energy sources (IRES) are renewable energy sources that are not dispatchable due to their fluctuating nature, such as wind power and solar power, as opposed to controllable renewable energy sources, such as dammed hydroelectricity or biomass, or relatively constant sources, such as geothermal power. Grids with high penetration of renewable energy sources generally need more flexible generation rather than baseload generation The Andasol plant uses tanks of molten salt to store solar energy so that it can continue generating electricity even after sunset. Class of renewable energy sources The 150 MW Andasol solar power station is a commercial parabolic trough solar thermal power plant, in Spain.
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