A monkey, falling onto a transformer at the Gitaru hydroelectric power station in Kenya, caused a nationwide blackout on Tuesday.

KenGen, the operator of Gitaru dam and Kenya’s largest electricity producer, posted a photo on Facebook of the dastardly monkey still perched atop the transformer. Using our crack zoological skills, it appears to be a vervet monkey, which is native to Kenya.

The monkey climbed onto the roof of the Gitaru power station and then dropped onto a transformer, tripping it. This then caused the other transformers to overload and trip, which in turn caused the whole power station to go offline. The loss of 180MW from the hydro plant was enough to cause a national blackout, according to KenGen.