Renewable energy commercialization involves the deployment of three generations of renewable energy technologies dating back more than 100 years. First-generation technologies, which are already mature and economically competitive, include biomass, hydroelectricity, geothermal power and heat.

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Policy makers often debate the constraints and opportunities of renewable energy. Renewable electricity production, from sources such as wind power and solar power, is sometimes criticized for being variable or intermittent.

Vietnam utilizes four main sources of renewable energy: hydroelectricity, wind power, solar power and biomass. At the end of 2018, hydropower was the largest source of renewable energy, contributing about 40% to the total national electricity capacity.

Renewable energy in Greece accounted for 29 percent of its electricity from renewable sources in 2021. By 2030, renewables are expected to have a capacity of 28 GW, and exceed 61 percent of Greece's electricity consumption.

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Asia may help lead the renewable energy era. Here is how Ember describes it: Electricity is now the fastest-growing type of energy use, and it has surpassed oil usage globally.

As of 2023, renewable energy sources accounted for about 22% of the Philippines' total installed electricity generation capacity, according to the Department of Energy. The Philippines remains a net importer of fossil fuels, which underscores the government's push to expand local renewable energy options.

In Honduras, there is an important potential of untapped indigenous renewable energy resources. Due to the variability of high oil prices and declining renewable infrastructure costs, such resources could be developed at competitive prices.