Elon Musk, the famous CEO billionaire of Tesla Motors, has never been shy about expressing ambitious goals. One of his biggest projects is SolarCity, which is meant to be a benchmark for powering the planet using clean energy. To showcase that this can be done, the company is powering an entire island using only solar energy.

The acquisition of SolarCity by Tesla was recently concluded, The Verge reports, costing the carmaker $2.6 billion in the process. To demonstrate that the payoff is going to be worth it, Tesla installed thousands of solar panels on the island of Ta’u, located American Samoa. Right now, all 600 residents of the remote area are enjoying sustainable, clean energy.

Originally, the island got its power mostly from diesel generators, which was not ideal. The practice was expensive and it was also causing pollution in what would otherwise be a pristine area. This is why Ta’u was the perfect test bed for proof of concept that communities can rely solely on solar power to work.

The success of the showcase is also incredibly important for Tesla because acquiring SolarCity was a risky move. Not only was the venture operating at a loss at $6 to every $1, it is also highly unfavorable during a time when the incoming U.S. president is a fierce denier of climate change. Under his administration, it’s very likely that clean energy companies are going to lose tax credits and subsidies, which could spell their undoing.

More than anything else, however, the island test is also meant to be an example of how the technology can be implemented right now. Entire cities that run on solar power drawn from microgrids don’t have to be a simple dream of tomorrow, Futurism reports. Fortunately, the demand for clean energy is still growing strong within the U.S. and especially among European countries.