one of the energy geysers

The energy geysers of Marni II are a special natural phenomenon of the second planet in the Marni system. These geysers spit a small amount of energy out every few minutes, hours, days or years (depending on which, the shortest is only 3 minutes and the longest is an impressive 400 years). These geysers exist because of a special type of energy stored in the planets core which crawls up slowly until reaching the surface where it bursts out of the ground. The geysers are in the places they are because of special 'pipes' of lower density in the mantle lead to a certain point. The amount of energy that comes free might look large but it would only be capable of running a primitive 2017 tablet for about 1 minute.