Canadian transformer manufacturer PSI Transformers received the order to replace a transformer for a hydropower station. The new transformer had to be able to switch between one transmission line at 250 kV and another at 143 kV. The test voltage required was a massive 1,000 kV. "To build a tap-changer for such extreme requirements, from our point of view, there was only one supplier we wanted to work with – and that was Reinhausen," states George Partyka Jr., Vice President of PTI Transformers.