U.S. energy company Constellation has unveiled an ambitious development plan to add up to 5,800 megawatts of electricity generation and storage capacity in Maryland. The objective is to secure the state’s energy supply in the face of growing demand while maintaining controlled costs for consumers. The proposal includes both short-term projects aimed at strengthening grid reliability and long-term projects focused on nuclear power and storage solutions.
Immediate projects to boost grid stability
As part of an expedited permitting programme, Constellation submitted proposals on October 31 to the Maryland Public Service Commission (PSC) for the deployment of natural gas generation units and battery storage systems. These projects would add around 1,500 megawatts of capacity, representing a 10% increase in the state’s total electricity production fleet. The group plans to install 800 megawatts of battery storage and more than 700 megawatts of thermal generation using existing gas units, which could later be converted to hydrogen.
Additionally, Constellation is considering extending the operational life of existing plants providing around 350 megawatts of capacity used during peak consumption periods. This approach is part of a strategy to leverage existing assets to accelerate the availability of reliable resources without triggering tariff increases.
Nuclear investments and prospects for new reactors
In the longer term, the plan proposes up to 4,000 megawatts in new or upgraded nuclear projects. Priorities include extending the operating life of Calvert Cliffs, Maryland’s only nuclear facility, whose two reactors are due to shut down in 2034 and 2036 respectively. A 20-year extension would preserve nearly 2,000 megawatts of capacity.
The group also plans to increase Calvert Cliffs’ output by 10% through modernised equipment, adding 190 megawatts—more than the total existing wind and solar generation in Maryland. A feasibility study is also underway to double the site’s capacity by constructing new advanced reactors, potentially supporting future economic demand.
Modular, competitive approach in a liberalised market
Constellation highlights the flexibility of its plan, allowing state authorities to choose the most appropriate mix of options. All projects operate under a competitive model with no direct public support or electricity price increases. The company is active within the PJM Interconnection, a regional transmission organisation covering 13 U.S. states.
According to Constellation, production costs in the PJM zone have remained stable for over 15 years despite rising capacity charges. In contrast, the recent increase in utility bills is attributed mainly to higher investments in transmission infrastructure, which earn regulated returns.
Demand-side management and grid innovation
The plan also includes a 1,000 megawatt “virtual power plant” initiative using demand-side reduction during peak periods. This concept, based on artificial intelligence and energy optimisation tools, aims to free up capacity by encouraging businesses to adjust consumption.
Constellation states it will assume all financial risks associated with the investments. The success of the plan will depend on local authorities providing a clear legislative framework, particularly regarding infrastructure for fuel delivery or conversion.
