"But our goal is to power all of them with 100% renewable energy. So we're tapping into energy from solar, wind, micro-hydro, biogas fuel cells, and geothermal sources," the company said. "We're designing new buildings and updating existing ones to use as little electricity as possible."
Apple has also been heavily investing in onsite energy production and partnering with third-party utilities that supply power from renewable sources.
"Even though we're manufacturing and shipping more products than ever, our carbon emissions per product have been dropping since 2011," the report said.
Apple's corporate offices, data centers and retail stores represent only 1% of the company's carbon footprint, while manufacturing in the U.S. and abroad makes up the lion's share.
From 2013 to 2014, Apple saw a 5% increase in manufacturing emissions attributed to the production needs of increased memory and storage capacity of its iOS devices and laptops.
But, the company said, its green corporate centers and retail stores "reflect our values, and we want them to act as models for others to follow. This is why we are constantly making our facilities more energy efficient and aggressively investing in renewable energy."
Over the past three years, Apple has reduced its facility emissions and those created by purchased electricity by 48%, "even while our overall energy consumption greatly increased."
Apple has been busily constructing new solar power plants around the country. Apple over the next year or so is expected to surpass Walmart as the largest corporate user of solar power.