Environmentalists will love the fact that Apple is moving in this direction. While large companies like Facebook and Google are looking into it as well, not forgetting that Facebook is building a data center in Iowa that will be fully powered by wind energy, it’s good to see Apple take such an initiative.

Special report: Apple’s ground-breaking bet on its clean energy infrastructure, with exclusive photos

In an unprecedented move — and one that hasn’t yet been repeated by other companies — Apple spent millions of dollars building two massive solar panel farms and a large fuel cell farm near its data center. These projects and are now fully operational and similar facilities (owned by utilities) have cost in a range of $150 million to $200 million to build. Apple’s are the largest privately-owned clean energy facilities in the U.S. and more importantly, they represent an entirely new way for an internet company to source and think about power.

One of the quirky parks of this setup is how Apple is going to keep the grass trimmed nicely.

Apple manages the grass under the panels in a variety of ways, but one of those is a little more unusual. Apple works with a company that ropes in sheep that eat the grass on a portion of the solar farm; when the sheep finish grazing on one spot, they’re moved to the next.

It’s a more sustainable option than running gas-powered mowers across the farm, and also has the added benefit that sheep can get into smaller spaces and up close to the panels. Some companies use goats to eat grass on plots of land, but goats could chew on the farm’s wiring and solar panel parts.