Escanaba voters overwhelmingly approved a referendum on Tuesday that would allow the city to close the power plant if the sale to Escanaba Green Energy falls through. Mayor Marc Tall says he is “gratified” that the referendem passed, by a vote of 509 to 229. That was well above the 60% threshhold needed for approval. At the same time, Tall says he remains confident that the sale to EGE will be finalized this week. That company has promised a check for more than two million dollars will be given to the city on Friday.