Electricity demand is expected to grow faster in the next 10 years than it has in the last 30 years. This growth is creating an urgent need for new generation to come online quickly to service load from data centers, advanced manufacturing, and electrification. The need for more power raises questions around whether new power plants can be built at the scale and speed of projected demand while maintaining an affordable and reliable grid.
Factsheet: Adding Power Without Building New Power Plants
While new power plants will certainly need to be built over the long term, and competitive power suppliers are investing billions of dollars in new generation resources, one timely and cost-effective way to add power to the grid is by expanding the capacity of existing facilities. Often overlooked, this path presents a critical and practical option to meeting America’s growing electricity demand in the immediate term.
In addition to building new plants, competitive power generators are already delivering this solution, often faster and with fewer constraints than building entirely new infrastructure. Instead of starting over with new sites, new permits, and new interconnections, existing facilities can be upgraded and repurposed through several well-established pathways:
- Uprates: Opportunities to increase output through equipment upgrades, efficiency improvements, or operational changes.
- Fuel Conversions: Converting existing plants to be more efficient, often converting “peaker” plants to baseload power or installing an alternative fuel source.
- Reactivations: Plants once slated for retirement are being reactivated or extended due to rising electricity demand.
- Hybridization: Many plants are adding batteries or other technologies to expand capacity and flexibility.
These approaches expedite getting new generation online without the regulatory delays, many of which can take years, that are present when breaking ground on a new power plant.
Faster Paths to Capacity
The advantage of upgrading existing infrastructure becomes clear when comparing timelines:
| Approach | Typical Timeline |
| New plant | 5–10 years |
| Uprate | 1–3 years |
| Fuel conversion | 2–4 years |
| Reactivation | Months–2 years |
Bringing a new power plant online can take up to a decade thanks to legal and regulatory processes like siting, permitting, financing, interconnection queues, and construction, all of which can add years to a project’s timeline. Uprates can be completed in one to three years. Fuel conversions, which transition plants from coal to natural gas or add dual-fuel capability, typically take two to four years. Reactivating retired units can happen in months.
These timelines are being executed by competitive generators right now. Independent power producers (IPPs) are delivering capacity additions while new generating resources work their way through the permitting and construction phase.
EPSA Members Lead by Example
EPSA member companies are proving that substantial new capacity can be added in a timely manner by updating existing infrastructure. LS Power, Vistra, NRG, Calpine, Talen Energy, Constellation, and AlphaGen are investing in projects that add or preserve thousands of megawatts of reliable capacity across U.S. power markets while improving efficiency and reducing emissions:
- LS Power has proposed projects in PJM that add steam cycles to existing simple-cycle plants, effectively converting them into combined-cycle facilities, significantly increasing output – adding about 70
- NRG has converted several coal units to natural gas. At the WA Parish plant in Texas, for example, parts of a coal facility have been transitioned to dual-fuel capability, improving flexibility and reducing emissions.
- Talen Energy is converting its Brunner Island facility in Pennsylvania into a dual-fuel, natural gas-capable plant.
- Vistra is growing its generation capacity and supporting grid reliability through new construction and uprates at existing sites, including some natural gas and nuclear plants. The company recently signed an agreement with Meta for 2,600 MW of capacity powered by Vistra’s nuclear plants in PJM. Through this agreement, Meta will purchase 2,176 MW of nuclear energy and support 433 MW of new generation capacity through uprates at Vistra’s three PJM nuclear sites. This new generation is the largest nuclear uprate supported by a corporate customer in the United States. With this agreement in place, Vistra is planning for license extensions at all three plants, which would extend operations of these carbon-free assets for another 20 years.
- Separately, Vistra signed a 20-year agreement with Amazon to supply up to 1,200 MW from Comanche Peak Nuclear Power Plant beginning in 2027.
- In September 2025, Vistra announced plans to build two advanced natural gas units totaling 860 MW at its Permian Basin Power Plant in Texas, more than tripling the site’s capacity from 325 MW to 1,185 MW. Since 2025, the company has also added more than 400 MW of capacity across its existing Texas gas fleet through upgrades.
- Constellation is pursuing license extensions and uprates, including projects tied to the Crane Clean Energy Center (Three Mile Island), helping maintain long-term nuclear generation capacity. Restarting the Crane Clean Energy Center would restore 835 MW of reliable, carbon-free energy to the grid.
- AlphaGen is advancing repowering and battery storage projects to support New York City’s long-term grid reliability, modernizing aging infrastructure in one of the nation’s most demanding energy markets.
- AlphaGen has also submitted approximately 2,700 MW of generation uprate and expansion projects at its existing facilities in PJM across Maryland, New Jersey, and Ohio. The proposals span ten distinct projects and include uprates to existing combined-cycle units and new dispatchable generation expansions. AlphaGen CEO Curt Morgan noted that “By focusing on uprates and expansions at existing sites, we can reduce development risk, minimize impact to local communities, and move more quickly to meet the needs identified by PJM and state policymakers.”
In total, competitive power suppliers have announced or constructed more than 12 GW of new capacity in the PJM Interconnection footprint alone since mid-2024 through new investment, uprates, or delayed retirements.
Bottom Line
Expanding existing capacity is one of the most effective near-term solutions to meet rising power demand. These projects deliver capacity additions faster and at lower cost than new builds, while making smarter use of infrastructure already in place.
As policymakers examine solutions to meet rising demand, they must recognize the value of the infrastructure already in place. By pursuing uprates, fuel conversions, and life-extension projects, EPSA member companies are helping ensure a more reliable, affordable, and resilient electric grid for the years ahead.
