Electric Transmission 101: How the Grid Works

The document describes the electric transmission grid as an interconnected system that moves electricity from generation sites to consumers via the path of least resistance. It outlines the grid's division into three major interconnections—Western, Eastern, and Ercot—and notes that transmission is governed by a mix of federal, regional, state, and local entities. The text highlights the necessity of transmission for delivering remote clean energy and the requirement for billions of dollars in investment to meet electricity demand and support expanded generation from renewable and conventional sources.

• The electric transmission grid is an integrated system that moves power over long distances from generation sites to consumers, characterized by the fact that electricity flows via the path of least resistance and cannot be routed or controlled like other transportation mechanisms.
• The power system is organized into three major interconnections—Western (West of the Rockies), Eastern (East of the Rockies), and Ercot (Texas)—which collectively comprise 8 regions and 135 balancing authorities.
• Transmission infrastructure is critical for accessing remote clean energy resources in rural areas and will require billions of dollars in investment to accommodate predicted short-term demand and the expansion of both renewable and conventional generation.

APA

Environmental and Energy Study Institute (2009). Electric Transmission 101: How the Grid Works. https://www.eesi.org/briefings/view/electric-transmission-101-how-the-grid-works120

Chicago

Environmental and Energy Study Institute. Electric Transmission 101: How the Grid Works. 2009. https://www.eesi.org/briefings/view/electric-transmission-101-how-the-grid-works120.

Wikipedia

{{cite report |author=Environmental and Energy Study Institute |title=Electric Transmission 101: How the Grid Works |date=15 January 2009 |url=https://www.eesi.org/briefings/view/electric-transmission-101-how-the-grid-works120 |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{environmentalandenergystudyinstitute2009electric, author = {{Environmental and Energy Study Institute}}, title = {{Electric Transmission 101: How the Grid Works}}, institution = {Environmental and Energy Study Institute}, year = {2009}, month = jan, url = {https://www.eesi.org/briefings/view/electric-transmission-101-how-the-grid-works120}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }