Puerto Princesa then Mayor Edward S. Hagedorn unveiled the environment-friendly and economical electric-powered “Trikebayan” (which does not emit any noise or carbon monoxide) at the Kapihan sa Sulo forum, Sulo Hotel, Quezon City. The Trikebayan costs only or $1.20 per day to operate, while a gasoline-powered tricycle operation would cost . Rolly Concepcion, who conceptualized the Trikebayan, said that converting a tricycle engine to electric costs . The rechargeable battery under the passenger seat can run for 12 hours. Mr. Conception died before the project was completed.