I work at a ski resort and we are having a power fluctuation problems that has been present for the last 3-4 years. We have a ski lift located just outside our maintenance office building and whenever it is on, it starts affecting our surge protectors and battery backups for our computer system, enough to cause some battery backups to die completely. At our 480v panel downstairs, we have a 75KVA 480v - 208y/120v 150C rise transformer that is used to supply power to the whole building. The 480v panel also supplies the power to the ski lift that affects our system. Measured voltage fluctuations are 107v to 155v.