If the power goes out and your electric skylight is stuck open, here’s how to close it: First, you’ll need a 5/32-inch Allen wrench. (For skylights manufactured between January 2010 and October 2012, you’ll need a 2.5-millimeter Allen wrench.)
Insert the 5/32-inch Allen wrench into the hole in the center of the plastic cap on the bottom middle of the skylight sash (the inner frame). Turn the wrench counterclockwise until the chain is free from the sash. Release the chain, lay it in the skylight frame and gently lower the skylight. Secure the chain back to the sash after power has been restored.