What is the name of the planned eco-city located in the UAE?

Masdar City is recognized as the planned eco-city located in the UAE, specifically designed to be sustainable and environmentally friendly. It aims to reduce carbon emissions and foster a community that uses renewable energy resources. This city serves as a model for sustainable urban living, featuring advanced technologies and innovative designs to minimize energy use and promote clean transportation.

In contrast, the other options do not represent eco-cities focused specifically on sustainable development in the same context as Masdar City. Dubai City is generally associated with the broader metropolitan area of Dubai, which while has many aspects of modern architecture and development, is not specifically a planned eco-city. Abu Dhabi Eco-City is a less recognized name and does not refer to a specific planned project like Masdar City. Energy City, while it implies a focus on sustainable energy, is not the designated name for the specific planned eco-city in the UAE that embodies these principles. Masdar City stands out for its purposeful design as an eco-city, making it the correct answer.