Renewable energy, a subset of clean energy, refers to power derived from natural sources that replenish themselves over short periods of time—including solar power, wind power, hydropower, geothermal, and biomass. Clean energy, more broadly, includes both renewable sources and technologies that reduce emissions from conventional systems, such as nuclear power.
In the United States, the renewable energy sector has experienced rapid growth over the past two decades, driven by supportive policies, technological advancements, and a growing societal emphasis on climate change. As more utilities, corporations, and consumers invest in renewables and consumers worry about the cost of electricity, a key question arises: Is renewable energy cheap to operate and maintain compared to non-renewable energy sources?
Operating and maintaining a power generation system involves all the activities and resources required to ensure it runs efficiently, safely, and reliably throughout its lifecycle. These include:
- Routine inspections and preventive maintenance
- Corrective repairs and component replacements
- System monitoring, diagnostics, and data analysis
- Labor, spare parts, and technical expertise
- Fuel procurement and management (where applicable)
While capital expenditures (CapEx) are incurred during construction, operation and maintenance (O&M) fall under ongoing operational expenditures (OpEx), which are critical to the long-term economic feasibility of any energy source. While subsidies exist for both renewable and non-renewable energy, renewable energy incentives are focused on CapEx costs.
Photovoltaic (PV) solar systems are among the cheapest to operate and maintain. With no moving parts and no fuel requirements, O&M consists primarily of solar panel cleaning and inverter replacement every 10–15 years. According to the U.S. National Renewable Energy Laboratory (NREL), utility-scale solar farms have O&M costs of around $10–$15 per kilowatt (kW) annually. Importantly, solar incurs zero fuel cost, significantly lowering total OpEx over its 25–30 year lifetime.
Wind turbines require moderate maintenance due to their mechanical components, including gearboxes and blades. Maintenance tasks involve lubrication, part replacement, and software updates. Onshore wind O&M costs typically range from $30 to $50 per kW per year. Like solar, wind has no fuel cost, making it far cheaper to operate than fossil-based systems. Offshore wind, while more expensive due to harsh environments, still benefits from fuel-free operation.
Hydropower plants are capital-intensive but have relatively low O&M costs once operational. Tasks include dam inspections, sediment removal, and turbine servicing. The U.S. Department of Energy (DOE) estimates typical O&M costs at $15–$30 per kW annually. Hydropower also operates without fuel costs, although output can vary seasonally based on water availability.
Geothermal systems have moderate O&M requirements, especially for subsurface infrastructure. Biomass plants, however, involve high operating costs due to labor-intensive fuel handling and combustion management. Geothermal O&M costs are roughly $30–$50 per kW, while biomass can exceed $70 per kW. Critically, biomass plants do incur fuel costs, unlike most renewables. Feedstock acquisition, transport, and storage contribute significantly to total OpEx.
Fossil fuel power plants—including coal, natural gas, and oil—tend to have high operational and maintenance costs due to their combustion-based nature.
- Coal-fired plants require extensive upkeep, including boiler inspections, emissions control systems, and ash disposal. O&M costs are typically $45–$75 per kW annually. In addition, coal plants incur substantial fuel costs, often accounting for 60–70% of total OpEx.
- Natural gas plants, particularly combined-cycle units, are less maintenance-intensive than coal but still demand regular turbine servicing and system monitoring. Their O&M costs range from $20–$50 per kW. Fuel costs are a major operating expense and fluctuate with global gas prices.
Unlike renewable energy technologies, fossil fuel plants must continuously purchase, transport, and burn fuel. This results in higher and more volatile operating costs. In contrast, solar power, wind power, and hydroelectric power offer near-zero marginal operating costs once built, providing long-term price stability.
Over the last decade, solar PV technology has benefited from standardized components and modular design, which reduce O&M complexity and lower costs. Newer or more complex systems may require more technical expertise and specialized parts.
Fuel cost is a decisive factor in operating economics. Renewables like solar energy and wind energy operate without any fuel input. Conversely, fossil plants and biomass facilities face recurring fuel procurement expenses that scale with generation output and market volatility. Fossil fuel plants are subject to global energy prices and trade relations, which can threaten energy security as well. Renewable energy production is not dependent on such fuel markets.
Location impacts both operational performance and maintenance needs. Dusty or snowy areas increase solar cleaning frequency. Coastal wind farms may experience salt-induced corrosion. Water scarcity affects hydropower output and turbine wear.
Utility-scale facilities typically achieve lower per-kW O&M costs due to economies of scale and centralized management. Distributed systems, such as rooftop solar, may incur higher individualized servicing costs per megawatt.
Modern energy systems increasingly use sensors, drones, and AI-based diagnostics for predictive maintenance, especially in new renewable projects. This trend reduces downtime, labor costs, and unplanned outages of solar photovoltaics and wind power projects.
- Solar Star (California):With over 1.7 million panels and a capacity of 579 MW, this solar farm operates with O&M costs under $15/kW annually. It benefits from zero fuel costs and automated performance monitoring.
- Alta Wind Energy Center (California):One of the largest onshore wind farms in the U.S., it demonstrates efficient O&M through predictive maintenance, with no fuel costs contributing to stable long-term economics.
- Grand Coulee Dam (Washington):As one of the largest hydropower facilities, it has high initial capital costs but benefits from low operational costs and zero fuel input over decades of operation.
While many renewable resources are low-maintenance, none are entirely maintenance-free. Equipment requires routine checks and repairs to maintain efficiency in electricity generation.
Although installation is a major expense, operational costs significantly impact long-term financial viability of energy generation projects. Renewable systems, with low O&M and no fuel costs, offer superior lifecycle economics.
Fossil plants may offer dispatchable power, but their fuel and maintenance costs are substantially higher, especially when considering emissions compliance and environmental regulations.
Fuel costs are a core component of operating expenses and strongly influence total cost of energy. Renewables avoid this burden entirely, creating a major economic advantage.
In the U.S. energy landscape, renewable technologies are proving to be both cost-effective and reliable to operate and maintain. Solar and wind energy, in particular, have low ongoing costs thanks to minimal maintenance needs and zero fuel expenses. Hydropower and geothermal also offer strong operational economics, though biomass lags due to fuel dependency.
Compared to fossil fuel plants, which are burdened by high fuel and maintenance costs, renewables present a compelling case for long-term affordability. The absence of fuel costs in most renewables not only reduces operational expenses but also shields providers from price volatility and supply risks.
As the U.S. continues its shift toward renewable power, understanding the full scope of operating and maintenance costs—including fuel—is essential. The evidence is clear: renewable energy is not only environmentally responsible but also economically efficient when viewed through the lens of operation and maintenance.