How the Electrical Grid Works

When there is more than one power source to choose from in a region, how do utilities choose the power? And what does "PPA" stand for?

Michael Goggin of the American Wind Energy Association answered these questions and more in a blog post aimed at clearing up some misinformation about wind power. 

Click through to read more:

Here’s a brief excerpt from the post:

Say you deposit $20 in the ATM near your office. A short time later, you withdraw it from the ATM near your house. You now have a different bill than the one you deposited, but that’s irrelevant; you still have $20.

This aspect of the banking system is analogous to how the electric power system works: it aggregates all sources of electricity supply and demand over a large geographic area, allowing one to add wind energy in one area and use an equivalent amount of electricity somewhere else on the grid.


Read the full blog post here.