Final Completion of Masdar City, the carbon-neutral development being built just outside Abu Dhabi, will be delayed until at least 2020, four years after its original deadline.

In an emailed statement released to Dow Jones, the government-backed renewable energy company said the city’s first phase would now be completed in 2015. It also stated that completion on the site would not take place until between 2020 and 2025.

Masdar also added that it may also bring in renewable power from external sources, contrary to its initial plan to use only onsite resources.

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