Efforts by some of the world’s largest Internet companies like Google, Facebook and Amazon to reduce the amount of energy their data centers consume is now bearing fruit.
According to a new report released on Monday from Lawrence Berkeley National Laboratory, the number of data centers has grown rapidly over the past several years to power our connected devices and always-on lifestyles. But the energy needed to support that growth has actually been flat.
That’s a big deal because it means that data centers don’t need to be as power-hungry as they once were. An analysis in 2008 also conducted by the Lawrence Berkeley Lab found that the amount of energy that data centers consumed was doubling every five years.
If data centers continued on that energy-intensive path, they would consume far more than the nearly 2% of total U.S. electricity they currently devour. This naturally caused major concern with Internet companies, which would have to pay for the extra costs for the additional power, along with policy-makers and environmentalists.
For more on data centers watch our video.
Instead, in recent years some of these massive Internet companies have intently focused on making their data centers operate more efficiently. These changes include building new data centers so that they use the outside air for cooling, instead of depending on power-hungry air conditioners to cool down servers, the computers that run the Internet.
Companies like Google eagerly adopted energy efficiency software in data centers, and built servers so they can automatically switch to a lower-power state when they’re not being used heavily. Companies also opted to use fewer servers by running each server they had more aggressively.
The result of these types of efforts is that U.S. data centers consumed 70 billion kilowatt hours in 2014, or about 1.8% of total U.S. electricity consumption in that year, the report found. That’s about the same as data centers consumed in 2010.
The energy use by data centers only grew 4% between 2010 and 2014. In contrast it grew 90% from 2000 to 2005, and 24% from 2005 to 2010. The report predicts that data center energy use will only grow another 4% between 2014 and 202o.
While the Internet companies that adopted these measures should be applauded, there’s another benefit to lowering energy consumption beyond environmentalism: savings. The collective energy savings from all these data centers over the past decade could equal $60 billion, says the report.
Get Data Sheet, Fortune’s technology newsletter.
The major energy savings are mostly coming from the new mega data centers built by Internet giants and cloud companies like Google (GOOG), Facebook (FB), Apple (AAPL), Amazon (AMZN) and Rackspace (RAX).
However, these types of savings aren’t being seen in most smaller and less efficient data centers by other companies. That could be because the companies that operate smaller data centers don’t have the resources of a company like Google to make upgrades. Google, for example, designs and makes its own servers, which most companies don’t do.
Smaller data centers will still account for about 60% of the energy used by data centers in the U.S. by 2020, the report predicts. But this means that there is still plenty of room for the smaller companies with data center to adopt the energy efficiency practices of the larger companies.