Uranus delivers more energy than it gets from the sun.

"Using decades of space data, scientists have cracked the mystery of Uranus’s hidden heat. While weaker than other gas giants, this internal warmth rewrites what we know about the icy planet — and fuels excitement for a long-awaited NASA mission. Credit: Shutterstock" (ScitechDaily, A Hidden Heat Source on Uranus Just Changed What We Know About Planets)

Outcoming particle flow can form a point-shaped thermal point in the atmosphere.

Can that extra energy form in friction, or in internal radioactive decay? Or does some kind of external radiation beam push energy to that planet's atmosphere? If some kind of beam of energetic particles hits Uranus's atmosphere, it forms a thermal point at that impact area. 

Uranus and its internal heat source challenge theories about planet formation. The heat source is visible in the Uranus atmosphere. That means Uranus shines more energy than it gets from the sun. There is a rocky planet inside that great atmosphere. The size of that structure compared to the planet's size is very small. That rocky planet is smaller, or its gravity is weaker than on Earth. The large atmosphere around that planet is the thing that we see when we look at that distant gas giant. The thermal source on that planet can form in a similar way to that on Earth. The mass of Uranus is far higher than that of Earth if we measure it from the highest point of the planet’s atmosphere. 

Uranus's pole can also pull high-energy particles into that planet's atmosphere. And that particle flow can raise Uranus's temperature. 

The atmosphere forms most of Uranus ' mass. The temperature of that atmosphere is about 45 Kelvin. And its top temperature is about 50 Kelvin. Or, 50 degrees over absolute zero. Hydrogen, maybe methane, and helium form that atmosphere. In theories, there was a small rocky planet somewhere in the Kuiper Belt, or in some theories, Uranus was a rogue planet that collected its atmosphere around it in extremely stable conditions. In extremely stable conditions, the small planet can collect a huge gas shell around it. The tilt axis of Uranus supports the theory that it could be some kind of rogue planet. The thing that makes Uranus interesting is that it's lighter than it should be. Neptune is far heavier, and that causes discussions about the origin of Uranus, which is the same size but far lighter than Neptune. 

The internal radioactive material, like radioactive potassium, can form an internal temperature that is measurable on Earth. Uranus’s atmosphere is far colder than Earth's, and that means that IR systems can detect that thermal source more easily than on warmer planets. The other thing is that the layers in Uranus's atmosphere don’t move at the same speed. The difference between the speeds of the atmosphere’s layers can cause friction. The laying axle of that planet means that Uranus acts like a locked planet. The temperature difference between night and day causes massive winds in its atmosphere. Uranus' rotation is 17 hours 14 minutes. But because the planet’s tilt is 82 degrees, that means Uranus turns its other pole to the Sun. 

The other explanation can be that the wind in the Uranus atmosphere forms friction at the point where gas meets ice or liquid form. That means the energy source can be in friction in the liquid or gas layers in Uranus’s structures. In models, there is liquid gas around the icy layer that surrounds the rocky layer. When energy from the sun hits Uranus's atmosphere, it raises its temperature. The thing that makes gas move is the difference in temperatures in the atmosphere. Even if Uranus has no solid surface, there can be structures that can cause friction in that planet’s atmosphere. The secrets of Uranus are big. There might be many secrets that wait for their finder in that icy and mysterious world's atmosphere. 

https://scitechdaily.com/a-hidden-heat-source-on-uranus-just-changed-what-we-know-about-planets/

https://en.wikipedia.org/wiki/Uranus