New York’s electric grid will need a massive buildout of new power generation and targeted transmission upgrades over the next two decades as demand rises, fossil-fuel plants retire and the state pushes toward cleaner energy targets, according to a draft report from the New York Independent System Operator.
The 2025-2044 System & Resource Outlook, released in draft form June 24, says the state’s power system is entering a period of unusually high uncertainty. Electricity use is expected to grow sharply from building electrification, electric vehicles, industrial growth, data centers and manufacturing facilities. At the same time, renewable projects are moving more slowly than earlier state targets assumed, offshore wind faces new federal and development headwinds, and aging fossil-fuel plants remain central to reliability in the near term.
The report does not present a single forecast. Instead, NYISO modeled a range of possible futures based on demand growth, clean energy policy choices, generation retirements, nuclear development, offshore wind availability and transmission constraints. The message across those scenarios is clear: New York needs more generation, more dispatchable capacity and more transmission capability than it currently has committed.
The report also raises practical concerns about the state’s ability to meet the Climate Leadership and Community Protection Act timeline, including the requirement that 70% of statewide electricity come from renewable sources by 2030 and that the electric grid reach zero emissions by 2040. NYISO’s analysis says achieving 70% renewable electricity by 2030 is not attainable under current conditions, even when accounting for high-probability renewable projects already under contract or financially committed. Those projects would bring renewable generation to about 40% of demand by 2030, leaving a substantial gap.
The findings have major implications for Upstate New York, including the Finger Lakes, Central New York, Western New York, the Southern Tier and the North Country. Much of the state’s future renewable development is expected to be concentrated upstate, while the largest and most constrained demand centers remain downstate in New York City, Long Island and the lower Hudson Valley. That geographic mismatch means Upstate communities could see more renewable siting pressure, while transmission bottlenecks could limit how much of that energy actually reaches customers.
Demand is rising faster than the system is changing
NYISO says statewide electricity demand is projected to increase materially through 2044, driven by electrification and the arrival of large, concentrated energy users such as data centers and manufacturing facilities.
The report says large-load interconnection requests alone could add up to 5 gigawatts of new demand over the study period. Unlike traditional demand growth, those projects can place heavy stress on specific parts of the grid because they are large, concentrated and location-dependent.
The demand increase also changes when the grid is most stressed. New York has historically been a summer-peaking system, with air conditioning demand driving the highest annual loads. But as more buildings and vehicles are electrified, the state is expected to become a dual-peaking system, with winter demand becoming just as important.
That shift matters because a winter-peaking grid requires resources that can perform during cold-weather conditions, when renewable output may be limited and neighboring states or provinces may also be under stress.
NYISO says demand growth is already outpacing resource additions. That narrows planning margins and increases the system’s dependence on the timing and location of new resources. In plain terms, it is not enough for New York to build more power. It has to build the right kinds of power in the right places, fast enough to replace retiring plants and meet rising demand.
The report also says the location of large new power users will matter. If data centers or major manufacturers are built near available generation or underused transmission capacity, they can reduce congestion and improve grid efficiency. If they are poorly aligned with the existing grid, they can increase the need for expensive upgrades.
Clean energy targets require a much larger buildout
The scale of New York’s future generation needs depends heavily on policy choices.
NYISO modeled futures with different levels of clean energy requirements. Scenarios that allow limited emissions require roughly 30 to 60 gigawatts of new resources. Scenarios that require a fully zero-emissions electric system require far more, approaching 105 gigawatts of new resources by 2044 under higher-demand conditions.
For comparison, NYISO notes that less than 15 gigawatts of new resources have been added to the New York system over the last 25 years. That contrast is one of the report’s most important findings. The buildout required under the most aggressive clean-energy scenarios is not just large. It is several times larger than anything the state has recently achieved.
The report says renewable resources will be essential, especially solar, land-based wind and offshore wind. But it also makes clear that renewables alone do not solve the reliability problem because they cannot always provide firm capacity during peak demand or periods of low output.
That is why dispatchable resources remain central in every modeled future. Dispatchable resources are power sources that can be called on when needed, including fossil-fuel plants, nuclear plants, hydrogen-capable generation or other firm resources.
In zero-emissions scenarios, NYISO says the system would need to replace the role currently played by fossil-fuel plants with a combination of renewables, nuclear, battery storage and hydrogen-based generation. But the report warns that hydrogen generation is not commercially available at the scale assumed in some scenarios and would require major new infrastructure for fuel production, storage and transportation.
Nuclear power plays a significant role in several scenarios because it can provide large amounts of zero-emissions energy and firm capacity. The report notes that New York has recently shown renewed interest in advanced nuclear development, including a potential 5-gigawatt buildout. NYISO’s modeling suggests nuclear availability and siting flexibility could materially affect how much other generation and transmission must be built.
The report is more blunt on fossil-fuel generation than many political discussions around the issue. It says that unless new zero-emissions technologies become commercially available at scale, continued reliance on fossil resources, including repowered and newer, more efficient fossil units, will be necessary to maintain reliability during the transition.
That does not mean fossil plants would run constantly. In less stringent emissions scenarios, NYISO says fossil resources would operate less often but continue to provide firm capacity, voltage support, ramping, reserves and other essential grid services. Repowering older fossil plants could also reduce emissions rates compared with the existing fleet while preserving reliability attributes.
Transmission bottlenecks could limit Upstate clean energy
The report repeatedly identifies transmission as one of the biggest challenges facing the grid.
Much of New York’s future renewable generation is likely to be built in Upstate regions where land, wind and solar resources are more available. But the largest electricity demand remains downstate. Moving energy from one region to the other depends on a limited number of bulk transmission corridors.
The Central East interface is the most important constraint identified in the report. It carries power from western and northern Upstate New York toward the Hudson Valley, New York City and Long Island. NYISO says congestion on that interface could rise sharply as more Upstate generation is built and downstate demand grows.
According to the report, annual demand congestion on Central East could reach roughly $2 billion to $5 billion by 2035, compared with about $325 million in 2025. That congestion represents the modeled cost impact of transmission limits that prevent lower-cost power from reaching load centers.
NYISO recommends targeted dynamic voltage support improvements across the Central East interface to reduce congestion and improve deliverability. That is a technical fix, but the policy meaning is straightforward: New York may not need only new transmission lines. It also needs targeted upgrades that allow existing transmission corridors to move more power reliably.
The report also identifies Northern New York as a major area of concern. Renewable development there is attractive because of natural resource potential and land availability, but the region faces a high risk of congestion and renewable curtailment. Curtailment occurs when renewable generators are available to produce energy but are forced to reduce output because the grid cannot move the power where it is needed.
In the most aggressive clean-energy scenarios, some renewable generation pockets face medium, high or severe curtailment risk by 2035. Northern New York pockets show some of the highest risk, while parts of the Capital Region also show elevated curtailment potential. That means renewable projects may be built but not fully used unless transmission capacity keeps pace.
For the Finger Lakes and Central New York, the broader takeaway is that Upstate regions will remain central to the state’s clean energy strategy. But without better transmission planning, more local renewable siting does not automatically translate into usable clean power statewide.
Policy choices will determine cost, risk and reliability
NYISO’s report does not tell state leaders which policy path to choose. But it does make clear that different choices carry very different consequences.
A strict zero-emissions pathway requires a much larger buildout, heavier reliance on technologies that are not yet deployed at scale and more pressure on transmission. A more flexible pathway that allows limited emissions reduces the amount of new generation needed, keeps more dispatchable resources available and may reduce the need for large-scale hydrogen deployment. But that approach would also slow or limit full electric-sector decarbonization.
Offshore wind is another major variable. New York’s clean energy plans rely heavily on offshore wind, but the report notes that recent federal actions, permitting uncertainty and project delays have changed near-term expectations. Without new offshore wind beyond existing and contracted projects, NYISO says the system would need far more upstate solar and other resources to meet renewable targets, increasing pressure on siting, transmission and land use.
The Champlain Hudson Power Express line, which connects New York with Hydro-Québec, is also a key uncertainty. NYISO says the line is expected to provide contracted clean energy, but there is limited operating data on how much additional power Hydro-Québec may be able to provide during peak periods. If that energy is not available when needed, New York may have to rely more heavily on internal generation and other regional imports.
The report’s principal recommendations focus on four areas: establishing a viable path for firm and flexible resources, coordinating new resource additions with retirements, increasing transfer capability across Central East, and supporting zero-emissions generation development in Northern New York with bulk transmission upgrades.
The next major planning step begins in August 2026, when NYISO opens the next Public Policy Transmission Planning cycle. That process will give stakeholders a chance to propose transmission needs driven by state policy requirements.
For now, the draft outlook leaves New York with a difficult but unavoidable conclusion. The state’s clean energy transition is still possible, but the current pace of resource development is not aligned with the scale of the challenge. Demand is rising. Retirements are coming. Transmission constraints are tightening. And the grid will need a level of coordinated investment that goes well beyond what is already committed.
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