Data Centre for NEXTDC Limited. M1 is NEXTDC's flagship Australian data centre facility located less than 3km from Melbourne's CBD. The Melbourne facility is the largest independent colocation data centre in the city, with six data halls measuring 1,000m² each and features a 400kW rooftop photovoltaic solar array – the largest privately funded installation in Australia, making it the first data centre in Asia Pacific to use solar power as a supplementary energy source.