Intermittency is a well-known weakness of solar and wind power, they’re good when the sun shines and the wind blows, say critics, but what about when it doesn’t? (Though there are some questions about all that.) The response of alternative energy enthusiasts tends to come in two flavors: better grid balancing–where reliable power sources, such as nuclear, take up the slack when needed or improved energy storage. The trouble with many of today’s storage methods, though, is that they are either not very good or too expensive. There are several new ones, including salt, but none are yet ready at scale. If you wanted to be hopeful about renewables, you might look at a project 900 miles off the coast of Spain, on the smallest of the Canary Islands. El Hierro measures only 104 square miles, but it is being viewed as a model for projects combining renewable power with pumped hydropower storage–perhaps the most viable currently available storage method. El Hierro’s $87 million scheme consists of an 11.5 megawatt wind farm (five turbines) that will provide the island’s 11,000 inhabitants with the majority of their power. Source: FastCompany.com
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