close icon

Energy Generation

Delivering a Clean & Reliable Energy Portfolio

Constellation is America's largest producer of clean energy. We’re focused on securing America's energy future with resilient energy sources that businesses, homes and public sector customers can rely on. Our diverse fleet of nuclear, hydro, wind, solar, geothermal and natural gas generation facilities generates more than 10% of the nation's emissions-free electricity, producing over 55 gigawatts of capacity.

As proven energy experts, our customers count on us to generate and provide electricity that's secure, resilient and available 24/7. We operate the U.S.' largest fleet of emissions-free nuclear power plants with an industry-leading nuclear capacity factor of 94% or higher.

 

We operate a broad range of energy facilities across different regions, markets and technologies as part of our commitment to provide reliable and sustainable solutions that meet our customers' needs. Our diverse generation portfolio includes a mix of zero- and low-carbon energy sources, including the nation's largest nuclear fleet, and hydro, wind, solar, geothermal and natural gas facilities.

 

Constellation has been a trusted leader in the drive toward a cleaner energy future for decades. We continuously invest in the latest technologies and solutions to strengthen and expand our portfolio, and our focus on securing America’s energy future is supported by the full strength of our fleet of nuclear, hydro, wind, solar, geothermal and natural gas facilities.

Our team of almost 16,500 employees drives our industry-leading performance through their commitment to our customers, communities and the environment.

Constellation is working to build an integrated grid that combines existing clean power facilities with new distributed generation technologies. Our culture of innovation provides new opportunities and promotes the early adoption of new technologies and processes. As we move toward a clean future of energy, all our energy sources will work together to provide the reliable power upon which the nation relies.

 

 

With Nuclear and Power as our core generation divisions, Constellation is the nation's leading clean energy producer with the largest nuclear fleet and the lowest carbon emissions intensity in the United States. Our operations produce more than 10% of the United States' emissions-free energy.

For 20 consecutive years, our nuclear plants have maintained an exceptional performance record, achieving a 2024​​ capacity factor of 94.6%. Our consistent performance enabled our nuclear fleet to produce approximately 182 million megawatt hours (MWh) of electricity in 2024.​​ 

Constellation Power manages, operates and maintains the Constellation's historic fleet of natural gas, hydroelectric, wind, ​solar and oil assets.

Calpine manages, operates and maintains Calpine's fleet of geothermal, natural gas, solar and battery storage assets.

We leverage our decades of expertise to support plant operators and generation owners across the country through a variety of outsourced products and services, including:

 

  • Constellation Generation Solutions (CGS): We work to meet the needs of the nuclear industry as a leading outage, maintenance and technical services provider, continuously strengthening, streamlining and expanding our services so we’re always prepared to address the work execution of the nuclear fleet.

    Learn more about Constellation Generation Solutions. 

  • PowerLabs: Since 1911, we have performed quality calibrations and testing services. We are also an approved nuclear supplier with a Quality Program that meets the requirements in 10 CFR 50; Appendix B, 10 CFR 21, NQA-1 and ANSI N45.2. Our extensive inventory of lab equipment performs the full spectrum of calibration, testing and analysis services, including failure analysis, parts quality testing, commercial-grade dedication testing and laser scanning.

    Learn more about PowerLabs.

 

We operate a broad range of energy facilities across different regions, markets and technologies as part of our commitment to provide reliable and sustainable solutions that meet our customers' needs. Our diverse generation portfolio includes a mix of zero- and low-carbon energy sources, including the nation's largest nuclear fleet, and hydro, wind, solar, geothermal and natural gas facilities.

 

Constellation has been a trusted leader in the drive toward a cleaner energy future for decades. We continuously invest in the latest technologies and solutions to strengthen and expand our portfolio, and our focus on securing America’s energy future is supported by the full strength of our fleet of nuclear, hydro, wind, solar, geothermal and natural gas facilities.

Our team of almost 16,500 employees drives our industry-leading performance through their commitment to our customers, communities and the environment.

Constellation is working to build an integrated grid that combines existing clean power facilities with new distributed generation technologies. Our culture of innovation provides new opportunities and promotes the early adoption of new technologies and processes. As we move toward a clean future of energy, all our energy sources will work together to provide the reliable power upon which the nation relies.

 

 

With Nuclear and Power as our core generation divisions, Constellation is the nation's leading clean energy producer with the largest nuclear fleet and the lowest carbon emissions intensity in the United States. Our operations produce more than 10% of the United States' emissions-free energy.

For 20 consecutive years, our nuclear plants have maintained an exceptional performance record, achieving a 2024​​ capacity factor of 94.6%. Our consistent performance enabled our nuclear fleet to produce approximately 182 million megawatt hours (MWh) of electricity in 2024.​​ 

Constellation Power manages, operates and maintains the Constellation's historic fleet of natural gas, hydroelectric, wind, ​solar and oil assets.

Calpine manages, operates and maintains Calpine's fleet of geothermal, natural gas, solar and battery storage assets.

We leverage our decades of expertise to support plant operators and generation owners across the country through a variety of outsourced products and services, including:

 

  • Constellation Generation Solutions (CGS): We work to meet the needs of the nuclear industry as a leading outage, maintenance and technical services provider, continuously strengthening, streamlining and expanding our services so we’re always prepared to address the work execution of the nuclear fleet.

    Learn more about Constellation Generation Solutions. 

  • PowerLabs: Since 1911, we have performed quality calibrations and testing services. We are also an approved nuclear supplier with a Quality Program that meets the requirements in 10 CFR 50; Appendix B, 10 CFR 21, NQA-1 and ANSI N45.2. Our extensive inventory of lab equipment performs the full spectrum of calibration, testing and analysis services, including failure analysis, parts quality testing, commercial-grade dedication testing and laser scanning.

    Learn more about PowerLabs.

Related Articles

Go To Newsroom
Constellation Completes Calpine Transaction, Powering America's Clean Energy Future

date picker Jan 07, 2026

Constellation Completes Calpine Transaction, Powering America's Clean Energy Future
Learn More
NRC Greenlights Constellation's $167 Million Digital Modernization Plan for Limerick Clean Energy Center; State-of-the-Art Technology Upgrades Will Enhance Reliability, Diagnostic Capability and Cyber Resilience

date picker Jan 06, 2026

NRC Greenlights Constellation's $167 Million Digital Modernization Plan for Limerick Clean Energy Center; State-of-the-Art Technology Upgrades Will Enhance Reliability, Diagnostic Capability and Cyber Resilience
Learn More
NRC Renews Operating Licenses for Clinton & Dresden; Constellation Investing $370 Million in State-of-the-Art Upgrades to Keep These Illinois Nuclear Facilities Online, Meet Rising Power Demand and Support Economic Growth

date picker Dec 16, 2025

NRC Renews Operating Licenses for Clinton & Dresden; Constellation Investing $370 Million in State-of-the-Art Upgrades to Keep These Illinois Nuclear Facilities Online, Meet Rising Power Demand and Support Economic Growth
Learn More
Constellation Wins Platts Global Energy Award for Crane Clean Energy Center Restart

date picker Dec 12, 2025

Constellation Wins Platts Global Energy Award for Crane Clean Energy Center Restart
Learn More
W. L. Gore & Associates Advances Its Emissions Reduction Efforts with Constellation's Hourly Carbon-Free Energy Matching Offering

date picker Dec 09, 2025

W. L. Gore & Associates Advances Its Emissions Reduction Efforts with Constellation's Hourly Carbon-Free Energy Matching Offering
Learn More
See More
Go To Newsroom