U.S. Wind Power Retrofit: Quiet Growth Under the Shadow of Trump's Policies

US Wind Power Repowering: Quiet Growth Under the Shadow of Trump's Policies

Despite President Trump's public opposition to wind power, the U.S. wind industry continues to expand clean electricity supply without adding new land by leveraging repowering strategies. As of 2024, the United States has installed over 150 GW of onshore wind capacity, and a large number of aging turbines are being replaced by more efficient new models, injecting new renewable energy into the grid.

Industry Background

U.S. wind power development began in the 1980s, with the lifespan of early wind farm turbines typically around 20-25 years. Today, many turbines installed from the 1990s to the early 2000s are approaching or have reached retirement age. At the same time, wind power technology has made enormous progress over the past two decades: individual turbine capacity has increased from 1.5 MW to over 4 MW, with longer blades, higher efficiency, and lower operation and maintenance costs. Repowering—removing old turbines and installing new units—has become a highly attractive option because it can utilize existing land, roads, and transmission facilities while bypassing the cumbersome siting approvals required for new projects.

According to a 2020 study published in *Nature* by the U.S. National Renewable Energy Laboratory (NREL, now the Rocky Mountain Laboratory), the optimal technical potential for U.S. wind repowering is as high as 161 GW. Further calculations by a Stanford University research team show that with the U.S. onshore wind installed capacity at 153 GW as of 2024, repowering could double capacity on the same land to 314 GW, increasing annual generation from 453 TWh to approximately 911 TWh. At that point, onshore wind would account for 21% of U.S. electricity generation, compared to the current 10.5%.

Current Development Dynamics

Repowering projects are already underway in many parts of the United States. Take the Mulqueeney Ranch Wind Repowering Project in California as an example. Initially, it planned to replace approximately 518 closely spaced aging turbines from the 1990s with 36 new turbines of 2.2-4.2 MW, totaling 80 MW. After adjustments due to wildlife conservation considerations, a final decision was made to install 19 turbines of the same class, maintaining the 80 MW total capacity. This process illustrates the importance of community consultation and environmental balance in repowering.

In the Midwest state of Iowa, GreenVolt Power and Bedrock Renewables have partnered to acquire three wind farms with a total capacity of 116 MW (commissioned between 2001 and 2007) for repowering. The project highlights the shift of wind power from one-time development to long-term asset management—wind farms are now seen as permanent assets requiring ongoing operation, maintenance, and upgrades, similar to thermal and gas power plants. Both parties stated that repowering not only enhances the long-term value of the projects but also brings sustained landowner income, stable tax revenue, and clean electricity to local communities.In North Dakota, Basin Electric Power Cooperative plans to replace 188 turbines at two wind farms. The project near Minot will retain the original towers and foundations, replacing only the blades, gearboxes, and electrical control systems, increasing turbine capacity from 1.5 MW to 1.6 MW. The local planning commission approved the project in June 2026, but it still needs permits from the Federal Aviation Administration (FAA) and the Air Force.

However, a hindrance is emerging: the Trump administration has delayed routine Department of Defense reviews for at least 250 onshore wind projects, introducing uncertainty to the repowering project timelines.

Impact on the Energy System

Wind repowering has multiple implications for the U.S. energy system. First, increasing clean electricity without adding new land helps alleviate grid expansion pressure and avoids development in ecologically sensitive areas. Second, repowering projects typically retain existing transmission infrastructure, avoiding the high costs and long construction periods of building new transmission lines. Third, new turbines provide more stable and predictable output, benefiting grid dispatch and reliable power supply.

From an economic perspective, repowering projects extend the economic life of wind farms, ensure rental income for farmers and landowners, and provide ongoing tax revenue for local governments. Against the backdrop of the Trump administration potentially cutting federal renewable energy subsidies, repowering projects, with their lower compliance risks and established social acceptance, become a more resilient investment.

Regarding carbon reduction targets, if onshore wind repowering reaches the 314 GW scale predicted by Stanford University, annual power generation would exceed 900 TWh, replacing about 250 million tons of coal-fired generation (based on average U.S. coal power carbon emissions), reducing CO₂ emissions by about 200 million tons per year.

Challenges

Despite the promising prospects, wind repowering faces multiple challenges. First is political resistance: the Trump administration's "American Energy Dominance" policy explicitly favors fossil fuels and shows strong hostility toward wind power. Although repowering projects use existing sites, they may encounter administrative delays in federal permits (such as Department of Defense aviation reviews). Trump has even questioned the economics and reliability of wind power itself, even though data from repowering projects show costs are already highly competitive.

Second is community consultation: NREL research points out that the repowering process involves non-technical factors such as aesthetics, noise, and "political negotiations," which may lead to capacity reductions. For example, the Mulqueeney Ranch project reduced turbine count from 36 to 19 due to bird protection issues. Community concerns about the height and visual impact of new turbines may also affect project scale.

Third is grid integration: as the share of wind power increases, the grid requires more energy storage and flexible resources to balance intermittency. Currently, U.S. energy storage deployment is accelerating, but transmission grid capacity upgrades remain a bottleneck. Additionally, repowering projects typically do not increase transmission capacity; if new turbines have higher output, they may exacerbate local line congestion.Finally, raw materials and supply chains: new wind turbines rely on rare earth permanent magnet materials, carbon fiber blades, etc. Uncertainty in global supply chains may affect the pace of repowering.

Future Outlook

In the next 5-20 years, wind repowering will become a key pillar of the U.S. energy transition. With potential policy fluctuations in a possible next Trump term, repowering projects are expected to maintain growth momentum due to their lower policy sensitivity and local support. Even if the federal level is negative, state-level renewable energy targets and corporate power purchase agreement (PPA) demand will still drive repowering investment.

From a technology trend perspective, the unit capacity of wind turbines will continue to increase, and larger blades and taller towers will further improve wind energy capture efficiency. Digital operation and predictive maintenance will also reduce repowering costs. After repowering, the capacity factor of wind farms can increase from 25% to over 40%, making wind power a more competitive baseload alternative.

Globally, similar repowering waves are emerging in Europe and Asia. U.S. technical experience can be extended to other countries with aging wind farms. In the medium to long term, wind repowering could unlock over 500 GW of global potential, becoming an important pathway to achieve Paris Agreement goals.

Trump's hostility towards wind power is hard to change, but wind repowering is steadily advancing right under his nose. As long as community support, economic improvements, and grid adaptability continue, U.S. wind power will truly become the backbone of the energy system without being "awakened."