Portugal recently made headlines after running for four days straight on renewable energy alone. [83] Liquid biofuels include bioalcohols, such as bioethanol, and oils, such as biodiesel. The United States conducted much early research in photovoltaics and concentrated solar power. Each REC represents the environmental benefits of 1MWh of renewable energy generation. ", E. Lantz, M. Hand, and R. Wiser ( 13–17 May 2012), Ken Berlin, Reed Hundt, Marko Muro, and Devashree Saha. As the cost of solar electricity has fallen, the number of grid-connected solar PV systems has grown into the millions and utility-scale solar power stations with hundreds of megawatts are being built. 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It is popular to repower old dams thereby increasing their efficiency and capacity as well as quicker responsiveness on the grid. Renewable energy can be defined as a kind of energy that’s collected from renewable resources, which are naturally replenished on a man timescale. Implementation of energy storage, using a wide variety of renewable energy technologies, and implementing a smart grid in which energy is automatically used at the moment it is produced can reduce risks and costs of renewable energy implementation. Renewable energy is energy that is generated from natural processes that are continuously replenished. Essentially, … As of 2017 only 4 other countries have deployments above 100 MW:[18] South Africa (300 MW) India (229 MW) Morocco (180 MW) and United Arab Emirates (100 MW). This would require wind turbines to be installed over large areas, particularly in areas of higher wind resources, such as offshore. 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