Because the wholesale electricity price fluctuates between $15,000 a megawatt hour and negative $1000 a megawatt hour the hotel owner installed a diesel generator, along with solar panels on the hotel roof, so when the wholesale price of electricity became too high, they could disconnect from the grid and generate their own power to save money. They had to monitor the price of electricity manually, and then when the price reached their desired limit, send a staff member out to the generator to switch it on, synchronise with the grid, and disconnect from the grid. They had to do the reverse when the price went back down to acceptable levels.