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The Grid
EPA - U.S. Environmental Protection Agency
U.S. Electricity Grid & Markets
This is a short, general explanation of the electricity grid, with some information on the use of the grid to transmit electricity from renewable sources.
CFR - Council on Foreign Relations
How does the U.S. Power Grid Work?
This article covers a variety of issues - a description of the grid, how it is regulated, what are its vulnerabilities, what are its strengths, how can it be improved and more.
Wikipedia - Electrical Grid
This article in Wikipedia describes the electrical grid, its history, its extent, how it is built, its functionality and its implicit impact on climate change.