Amazon's cloud-computing unit says that one day it will rely solely on renewable power. But Greenpeace reports that a ramp-up in data-center construction in Virginia, where electricity comes mostly from coal and nuclear plants, makes that goal elusive. From the report: Apple, Google, Facebook, and newcomer Switch are taking some of the greatest strides towards 100% renewable energy, while companies such as Netflix, Amazon Web Services, and Samsung are lagging. The findings in Greenpeace USA's report outlines the energy footprints of large data center operators and nearly 70 of the most popular websites and applications. "Amazon continues to talk a good game on renewables but is keeping its customers in the dark on its energy decisions. This is concerning, particularly as Amazon expands into markets served by dirty energy," said Greenpeace USA Senior IT Analyst, Gary Cook. "Like Apple, Facebook, and Google, Netflix is one of the biggest drivers of the online world and has a critical say in how it is powered. Netflix must embrace the responsibility to make sure its growth is powered by renewables, not fossil fuels and it must show its leadership here," continued Cook.