Some airplanes have a ram air turbine that is lowered when electrical power is lost to provide a backup to power a hydraulic pump and limited electrical generator. As for the loss of the engines, all airplanes can glide to a landing.

Yes, a plane can safely land even if all its engines fail, as aircraft are designed to glide through the air rather than fall out of the sky. A typical commercial jet has a glide ratio of approximately 10:1 or 12:1, meaning for every mile of altitude it loses, it can travel about 10 to 12 miles forward. If a plane suffers a total engine failure at a cruising altitude of 36,000 feet (about 6 miles up), it can glide for roughly 60 to 70 miles, giving the pilots 20 to 30 minutes to find a suitable runway or landing site. Famous examples include the "Miracle on the Hudson" and Air Transat Flight 236, which glided for 17 minutes to a safe landing in the Azores. Pilots are rigorously trained in "dead-stick" landings, and during almost every flight, the engines are set to "idle" during descent, meaning you have likely experienced the sensation of gliding already. As long as the aircraft maintains sufficient forward airspeed to generate lift over the wings, it remains fully controllable and can be steered to a safe touchdown by a skilled flight crew.