When Apple released its “Apple Facilities Report 2012” on President’s Day, it disclosed what will likely be the largest privately owned, onsite PV array in the world: A 20-megawatt photovoltaic array at its new Maiden, N.C., datacenter, which has achieved LEED Platinum status.

While it’s a step in the right direction, the company needs to do more, according to Greenpeace.

The array is being built adjacent to the datacenter on 100 acres. It will help power the datacenter’s massive energy needs, as will a 5-MW, biogas powered fuel cell system, which is expected to come online later this year. Together the two plants are expected to produce roughly 82 million kilowatt hours of electricity annually for the facility.

“In terms of the solar facility for onsite generation, it’s great that Apple’s doing it,” said Gary Cook, IT analyst for Greenpeace. “It’s a significant scale of solar that’s great.”

Greenpeace tracks how much clean energy IT companies and datacenters use based on local power plants and information given by the companies.

But Greenpeace said Apple should do more.

The organization already ran a successful campaign to get Apple to eliminate hazardous materials from its supply chain and increase recycling efforts. It recently released its Cool IT Leaderboard and will soon update its “How Dirty is Your Data?” report.

“We’ll certainly be taking a close look at this,” Cook said.

The solar and fuel cell are only expected to make up between 8 percent and 10 percent of the energy used at the site, but Apple hasn’t said how much power the site will use.

“Assuming they don’t tell us anymore,” said Cook, “what we estimated conservatively is that the data center could be 100 megawatts.”

While Cook praised Apple for taking this step, he said Greenpeace is concerned about where the energy being used at Apple’s sites is coming from.

“It’s a very energy intensive facility in an area of the country where the majority of electricity comes from coal,” he said. “Their Maiden facility is 30 miles from one the biggest coal plants in the country.”

Apple should work, like Google, to influence where their electricity suppliers get their power from, according to Cook.

Apple also announced plans for another new “green” datacenter, which it will build in Oregon. Cook also is concerned about Apple’s electricity procurement strategy there.

“They seem to be doubling down on coal exposure for the iCloud,” he said.

In the report, however, Apple said it is working toward a net-zero energy goal for its corporate facilities across the world.

“Our facilities located in Cork, Ireland; Munich, Germany; Austin, Texas; and Elk Grove, California are currently using 100 percent renewable energy resources,” said Apple in a release.

The company also is pursuing strategies to reduce energy use, add in more onsite generation and offsite renewable energy generation.