Electric Utilities

1. Duke Energy Corporation (Ticker: DUK)
   • One of the largest electric power holding companies in the US. Operates in multiple states and provides electricity to millions of customers.
2. NextEra Energy, Inc. (Ticker: NEE)
   • A leader in renewable energy, including wind and solar. Operates Florida Power & Light and other subsidiaries.
3. Dominion Energy, Inc. (Ticker: D)
   • Provides electricity and natural gas to various regions. Active in renewable energy development.
4. Southern Company (Ticker: SO)
   • Operates electric utilities in the southeastern US and focuses on expanding its clean energy portfolio.
5. Exelon Corporation (Ticker: EXC)
   • A major player in the electric and natural gas markets, with a focus on zero-carbon energy generation.

Renewable Energy

1. First Solar, Inc. (Ticker: FSLR)
   • Specializes in solar panel manufacturing and large-scale solar power project development.
2. SunPower Corporation (Ticker: SPWR)
   • Focuses on solar energy systems and panels for residential and commercial applications.
3. Enphase Energy, Inc. (Ticker: ENPH)
   • Designs and manufactures solar microinverters and energy storage systems.
4. Plug Power Inc. (Ticker: PLUG)
   • Focuses on hydrogen fuel cell systems for energy storage and electric mobility.

Electric Infrastructure & Technology

1. Tesla, Inc. (Ticker: TSLA)
   • While primarily known for electric vehicles, Tesla also has a significant presence in energy storage and solar products.
2. Schneider Electric SE (Ticker: SBGSF)
   • Operates in the US through subsidiaries, providing energy management and automation solutions.
3. Eaton Corporation (Ticker: ETN)
   • Focuses on power management technologies, including grid systems and renewable energy support.

If you're interested in exploring specific sectors, let me know!

Here are some prominent US-listed companies specializing in electric infrastructure—including electric wires, transformers, and related equipment:

Electric Wires, Cables, and Accessories

1. Southwire Company (Privately Held)
   • Although not publicly listed, Southwire is a significant player in the US for electric wires and cables.
2. General Cable Corporation (Acquired by Prysmian Group)
   • Previously listed, now part of Prysmian Group, a global leader in wire and cable manufacturing.
3. Encore Wire Corporation (Ticker: WIRE)
   • Manufactures copper and aluminum wire for residential, commercial, and industrial applications.
4. Belden Inc. (Ticker: BDC)
   • Produces signal transmission solutions, including cables for energy and data.

Transformers and Electrical Components

1. Eaton Corporation (Ticker: ETN)
   • A major player in power distribution and transformer technologies, including smart grid solutions.
2. ABB Ltd. (Ticker: ABB)
   • Specializes in transformers, substations, and grid automation. Operates globally with a significant presence in the US.
3. Siemens Energy AG (Ticker: SMEGF)
   • Produces transformers, circuit breakers, and high-voltage equipment. Although based in Germany, it operates widely in the US.
4. GE Vernova (Part of General Electric, Ticker: GE)
   • The energy division of General Electric focuses on power equipment, including transformers and grid systems.
5. Powell Industries, Inc. (Ticker: POWL)
   • Manufactures electrical infrastructure, including switchgear and transformer enclosures.

Utility-Scale Infrastructure Providers

1. Quanta Services, Inc. (Ticker: PWR)
   • Specializes in infrastructure solutions for electric power and renewable energy.
2. MasTec, Inc. (Ticker: MTZ)
   • Focuses on the construction and maintenance of electric utility systems, including transmission lines and substations.
3. Ameresco, Inc. (Ticker: AMRC)
   • Provides energy efficiency and infrastructure solutions, including transformer upgrades for utilities.

Specialty Components and Smart Grid

1. AMETEK, Inc. (Ticker: AME)
   • Manufactures electronic instruments and electromechanical devices, including transformers for industrial use.
2. Schneider Electric SE (US Subsidiary)
   • Produces energy management systems, transformers, and smart grid components.
3. Cooper Power Systems (Part of Eaton)
   • Produces transformers and voltage regulators, focusing on reliability and efficiency.