![Transmission line right-of-way at the summit of Blue Mountain, Monroe County, Pennsylvania, along the Appalachian Trail. [Credit: Nicholas A. Tonelli, CC BY 2.0, via Wikimedia Commons.]](https://macskamoksha.com/wp-content/uploads/2025/12/Transmission_8483100539-scaled.jpg)
Transmission line right-of-way at the summit of Blue Mountain, Monroe County, Pennsylvania, along the Appalachian Trail. [Credit: Nicholas A. Tonelli, CC BY 2.0, via Wikimedia Commons.]
Mention “renewable energy infrastructure” and most people will probably picture solar and wind farms out in the country. What’s usually not envisioned is how the power from these often remote sites is brought to the cities and towns where it’s used. Obviously that part is essential, and it’s accomplished with high-voltage transmission lines, usually aerial (rather than buried). “High-voltage” is anything from 115 kilovolts (kV) up. For long distances, 354 kV and 500 kV lines are common.
Currently (no pun intended) the US has 200,000-240,000 miles of high-voltage transmission lines. In order to decarbonize or electrify the nation’s energy supply, many miles of new transmission lines would be needed. How many? The most commonly mentioned estimate is to double the present amount by 2035. However, according to a well-known and oft-cited Princeton study, two to five times as much will be required by 2050 to reach net-zero, which translates to a million or more new miles of lines.
Transmission lines are not benign structures. They have their own environmental impacts, both on-site and off-, that are not trivial. Besides the lines and towers themselves, there are also transformers, substations and other related infrastructure including roads.
On-site impacts include:
- Habitat loss (locally)
- Habitat fragmentation (regionally)
- Bird injury and death
Off-site impacts result from the manufacturing of the components themselves, and include everything from raw material extraction to component manufacturing to transportation.
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