The white "cloud" is an unidentified object. Further more frames.
“If the object had stayed on our territory for a few seconds, it would most likely not have been noticed when watching the video. However, the object was in the camera lens for about an hour,”said Hillar Nuut, head of the West Estonian branch of the energy company Fortum Termest.
The video camera filmed a luminous ball, about a meter in diameter, slowly moving at a distance of 30 meters from the camera. He flew up to the container with spare parts and was near it for some time. The object did not reflect off the walls or the ground. For a while, he disappeared from the camera lens, and then came back again.
“I don't believe it was fireball. I looked for information on this and found out that the ball lightning is in one place for several seconds, and not for an hour,”Nuut said. The object disappeared early in the morning when it began to brighten. So far, the managers of the thermal power plant have not released the video to the general public. Therefore, UFO experts have so far refrained from commenting.