Hydro energy production involves the use a huge amount of underground pipes and water tunnels. The inspection of this critical infrastructure requieres time and the use of specially trained staff. Some activities also involves risks for humans, such as the inspection of vertical or inclined penstocks, normally existing in hydro power plants. Hovering Solutions robots are able to cover a whole penstock inspection in less than 1 hour, or gather data along 7km of hydro tunnels in a single flight with no human intervention.