When Life Gives You Oranges Make . . . Electricity?

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Seville's streets are lined with gorgeous orange trees (Credit: Simon & Vick/CC-BY-NC 2.0/Flickr)

The over 48,000 orange trees that permeate all corners of Seville, Spain, not only fill the city's air with the pleasant smell of azhar, or orange blossoms, in spring; they also yield over 16,500 tons of fruit every winter. Though that gives the capital of southern Spain’s Andalusia region the bragging rights of being Europe's top orange-producing city, the fruit is too tart to be consumed fresh. While some of the produce is used to make marmalade and orange liqueur, most of it ends up in Seville's landfills. However, that may change soon thanks to an ingenious idea to use the oranges to produce clean energy.

The pilot program is being launched by the city’s council and parks department in collaboration with Emasesa, Seville’s water supply and sanitation division. Juice extracted from 38.6 tons of oranges will be left to ferment in an existing biogas facility. The methane released from the fermented liquid will be captured and used to drive a generator to produce clean power. The officials estimate the test run will generate about 1,500 kWh of energy — enough to run one of Emasesa's water purification plants. To ensure there is no waste, the orange skins, peels, and pulp will be used as fertilizer or compost.

The electricity produced during the pilot program will be used to power a water purification plant (Credit: Emasesa)

“The juice is fructose made up of very short carbon chains, and the energetic performance of these carbon chains during the fermentation process is very high,” said Benigno López, the head of Emasesa’s environmental department. “It’s not just about saving money. The oranges are a problem for the city, and we’re producing added value from waste.”

If successful, by 2023, the city hopes to recycle all the oranges and add the electricity generated back to its grid. In trial runs, 1000 kilos (2200 pounds) of oranges yielded 50 kWh of clean energy — enough to fulfill the daily electricity needs of five homes. The project team estimates that if all the fruit is recycled, it will produce enough energy to power as many as 73,000 residences.

The oranges will eventually be able to power 73,000 homes daily (Credit: Emasesa)

“Emasesa is now a role model in Spain for sustainability and the fight against climate change,” Juan Espadas Cejas, the mayor of Seville, said in the press conference announcing the pilot scheme. “This project will help us to reach our targets for reducing emissions, energy self-sufficiency, and the circular economy.”

The latest endeavor is among the many initiatives being implemented across Spain to achieve the country's goal of switching its electricity system to renewable sources by 2050 — and if everything goes according to plan, fully decarbonizing its economy shortly after that.

Resources: FastCompany.com, Guardian.co.uk,

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214 Comments
  • darklight_rp
    darklight_rpWednesday, July 7, 2021 at 10:13 pm
    oranges can make electricity?!?!!? *shocked*
    • mattchien
      mattchienThursday, June 10, 2021 at 11:34 pm
      That is literally the most amazing thing I have ever seen!(and I do not say things like that very often.) : )
      • candycrybaby
        candycrybabyTuesday, June 1, 2021 at 1:45 pm
        me and my sixth grade class are doing a project on this and so far im LOVING it
        • emeralddragon17
          emeralddragon17Wednesday, May 19, 2021 at 10:22 pm
          With this, i can make electricity for 10 years!
          • purplerain44
            purplerain44Wednesday, May 19, 2021 at 11:58 am
            LIKE WOW!!!
            • purplerain44
              purplerain44Thursday, May 6, 2021 at 8:59 am
              Wow
              • theminecraftkid
                theminecraftkidTuesday, May 4, 2021 at 8:16 am
                That's a lot of electricity wow!
                • sockie
                  sockieMonday, May 3, 2021 at 4:42 am
                  I am doing a current event for this article!
                  • undyneiscool
                    undyneiscoolThursday, April 29, 2021 at 8:28 am
                    oh btw doglover5 I like dogs too especialy my own
                    • undyneiscool
                      undyneiscoolThursday, April 29, 2021 at 8:26 am
                      I like this website