Driverless cars, drones, and artificial intelligence may be the talk of Silicon Valley, but  Bill Gates wants to steer disrupters back toward one industry in particular: renewable energy.

The Bill and Melinda Gates Foundation's annual letter details its efforts to reduce hunger, poverty, and disease, among other issues. The theme of this year's letter: "If you could have one superpower, what would it be?" Bill Gates wished for more energy, while Melinda Gates wished for more time.

While Bill Gates thinks that today's teenagers will be the ones to make a breakthrough, he says it wouldn't hurt if they took a few lessons from the Silicon Valley leaders who came before them.

"A few dozen more people like Elon Musk would be great," he told Bloomberg on Monday.

Past topics of the foundation's annual letters include government spending and how organizations can measure progress,  but the overall message is the same. As Bill Gates wrote in his 2012 letter, "innovation is the key to improving the world. When innovators work on urgent problems and deliver solutions to people in need, the results can be magical."

Gates believes that in 2016, the world should focus on creating a "clean, cheap energy source." He explained that creating a better source of renewable energy would not only slow the affects of climate change, he believes it will also lift many of the nearly 1.2 billion people who live without electricity out of poverty.

While Gates writes that, "governments have a big role to play in sparking new advances, as they have for other scientific research," he calls on Generation Z, "one of the most globally minded in history," to stay active in energy and climate change issues. 

"If you're someone with some crazy-sounding ideas to solve our energy challenge, the world needs you. Study extra hard in your math and sciences. You might just have the answer," Gates writes. 

Despite the ambitious task at hand, Gates says he believes that the world will have a clean energy breakthrough within the next 15 years.