Costco loses power on Opening DayGUILDERLAND, N.Y. (WNYT) — A power outage briefly left Guilderland’s new Costco in the dark on opening day. NewsChannel 13’s Zach Richter said shoppers inside said they were told to check out before the registers ran out of battery. Everybody just was waiting, patiently waiting,” said shopper GeoffreyVan Epps. As lines grew, the store temporarily closed and some people waited outside to get in or sign up for memberships. “When we approached the door and a Costco sales reps or worker said that the store was closed, they weren’t letting anybody in because the power was out,” said Shopper Patricia McEvoy.