My guineas stay inside a very large cage within a large completely wire-enclosed dog pen at night. There is no electricity anywhere near it. My chickens have a coop with electricity ran to it via entension cords right now. The coop is large and can be secured at night. We had a medical emergency run to Illinois this past Sunday and I couldn't find anyone home to see to the poultry since I knew we would not make it back home till way after dark. I worried myself sick about the poultry not being locked up. When we returned home...all were safely inside the coop including ducks and guineas!!! Now the guineas go into the coop on their own each night when the chickens go to roost. I am so happy they all get along so great as now I will not worry about the guineas being warm this winter. They will be safe and secure in with the chickens!!