It looks like solar powered is advancing in a way with the Solara, a drone that can reportedly stay up in the skies for as long as 5 years and performing various tasks as deemed needed.
Called the Solara, the solar powered drone comes from Titan Aerospace. It is an unmanned drone which will remain airborne for about 60,000 feet above the earth. To keep it up there, the Solara will turn to its solar power capabilities which will be channelled through 3,000 solar cells capable of producing 7 kW each.
Once above the clouds, it can perform a variety of different tasks, such as crop or fire monitoring, providing internet access, scientific research, and even anti-piracy surveillance for those out at sea.