![]() What Is the Difference Between RECs and Offsets?Ī renewable energy certificate, or REC (pronounced: rěk, like wreck), is a market-based instrument that represents the property rights to the environmental, social, and other non-power attributes of renewable electricity generation.Renewable Electricity: How Do You Know You Are Using It? (pdf) This fact sheet provides an overview of RECs, overview of REC tracking systems, review of how to ensure that the RECs are not double-counted, overview of the roles of electricity regulators, overview of renewable generators and purchasers, and a brief discussion of the international use of RECs.Įxplore the sections below to learn more about renewable energy certificates (RECs). National Renewable Energy Laboratory, 2015.Voluntary Renewable Energy Markets (pdf) (692.68 KB) Compare the version number listed there to the version number on your "Software Update" screen, and you'll know for sure whether you have the latest version for your particular device.Describing Purchaser Impact in U.S. ![]() ![]() If all else fails, you can always see the latest release of iOS listed on Apple's support website under "Get the latest software updates from Apple." Those listings show compatible devices, too. Apple traditionally supports older iPhones with iOS updates for about five years before moving on.Īnother reason that you might not see an update is that when Apple releases new versions of iOS, it rolls them out by region over the course of about a day, so if you're anticipating a download but it hasn't shown up yet, check again later in the day. The most common reason is that you have an older iPhone and the latest update isn't compatible with your device. If you know that there's a newer version of iOS available, but you aren't seeing it when you check for updates, there could be a few reasons why. Related: How to Back Up Your iPhone With iTunes (and When You Should) If an Update Isn't Showing up as Expected ![]()
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