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Five diesel generators provide emergency backup power to the facility. In a complete failure of mains power, the centre requires only two to keep it up and running. This allows HP to take an entire generator offline for maintenance, without impacting redundancy. The start-up time for the generators is 50 seconds, well within the 1 hour window that the facility's uninterruptible power supply (UPS) systems provide for fail-over. These systems are responsible for the site's 99.982 per cent uptime guarantee.