Solar and wind are getting cheaper. But are we confusing cheap electricity generation with affordable, reliable electricity?
For years, we have been told that renewable energy is the cheapest solution for the world’s electricity needs. Solar panels are becoming more affordable. Wind turbines are expanding across continents. Governments are accelerating investments in renewable technologies.
And the message is everywhere:
Solar and wind are cheaper than fossil fuels…end of discussion.
Not so fast.
Because there is a fundamental question that too often disappears from the conversation:
Are we comparing the cost of generating electricity, or the cost of delivering reliable electricity whenever consumers need it?
Those are not the same thing.
And confusing them can lead to expensive energy policies, questionable investment decisions, and electricity systems that struggle to provide adequate power when demand is highest. The uncomfortable truth is not that renewable energy is always more expensive than coal.
The uncomfortable truth is that cheap generation does not automatically translate into a cheap, reliable electricity system.
And that distinction deserves much more attention.
Is Renewable Energy Really Cheaper Than Coal?
The short answer is yes in many new-build electricity generation comparisons, but not necessarily when evaluating complete system costs or comparing new investments with existing power plants.
According to the International Renewable Energy Agency (IRENA), 91% of newly commissioned utility-scale renewable capacity in 2024 generated electricity at a lower levelized cost than the cheapest new fossil fuel-based alternative.
The global weighted-average levelized cost of electricity was approximately:
| Energy source | Average generation cost in 2024 |
|---|---|
| Onshore wind | USD 34/MWh |
| Utility-scale solar PV | USD 43/MWh |
| Hydropower | USD 57/MWh |
Source: IRENA, Renewable Power Generation Costs in 2024. Figures are global weighted averages for newly commissioned projects, not guaranteed prices for every market.
Lazard’s 2026 LCOE+ analysis also identifies renewable technologies as highly competitive for new electricity generation without tax subsidies.
So, claiming that coal is universally cheaper than solar and wind would ignore the evidence.
But the numbers raise an important question.
What exactly are these reports measuring?
Most generation-cost comparisons focus on the levelized cost of electricity, commonly known as LCOE.
And LCOE is useful.
But it does not tell the entire story.
The LCOE Problem: Cheap Electricity Is Not the Same as Reliable Electricity
What Is the Levelized Cost of Electricity?
The Levelized Cost of Electricity, or LCOE, represents the average lifetime cost of producing one unit of electricity from a generation asset.
It generally considers investment costs, financing, operation and maintenance, fuel when applicable, and the electricity generated throughout the plant’s useful life.
The result is expressed in USD/MWh or another currency per unit of electricity.
This metric is valuable for comparing generation investments.
But LCOE does not independently capture every cost or benefit associated with integrating a generating resource into a complete electricity system.
It does not automatically represent the value of electricity at a specific hour, the adequacy of supply during extreme conditions, or the full cost of transmission, balancing, and flexibility requirements.
And those differences matter.
Why Can Two Sources with Similar LCOE Have Different System Values?
Imagine two power plants.
Plant A generates electricity at USD 40/MWh whenever sunlight is available.
Plant B generates electricity at USD 60/MWh and can be dispatched when the electricity system needs additional supply, subject to its operational limitations.
Which one is cheaper?
If the objective is to purchase electricity during sunny hours, Plant A may offer a clear economic advantage.
But what happens at 8:00 p.m. when solar generation has fallen and electricity demand remains high?
What happens during several cloudy days?
And what happens if an electricity system experiences seasonal shortages of other generation resources?
The answer depends on the entire generation portfolio.
The system may rely on hydropower, batteries, gas turbines, coal-fired plants, nuclear power, demand response, imports, or other flexibility resources.
Every option has different costs, capabilities, emissions, and limitations.
The cheapest MWh is not necessarily the MWh that provides the greatest value to the electricity system.
This is why electricity planning cannot depend on LCOE alone.
The Hidden Costs of Renewable Energy Integration
1. Intermittency: The Sun and Wind Do Not Follow Electricity Demand
Solar and wind technologies have major advantages.
They do not require purchased fuel during generation, have relatively low operating costs, and can reduce the consumption of fossil fuels.
But they also depend on weather conditions.
Solar panels cannot generate electricity at night without another source of stored or supplied energy.
Wind turbines require suitable wind speeds, and their output varies as weather conditions change.
These characteristics make solar and wind variable renewable energy sources.
Variable does not mean useless or inherently unreliable.
It means that their output cannot always be dispatched on demand.
Electricity systems must balance generation and consumption continuously.
As the share of variable renewable energy increases, planning must account for periods when production and demand do not coincide.
The International Energy Agency’s Integrating Solar and Wind report identifies flexible generation, stronger grids, energy storage, and demand-side response as important elements for integrating large shares of renewable electricity.
The IEA warns that delays in developing integration measures could put as much as 15% of potential solar and wind generation at risk by 2030 in its analyzed scenario.
That is not an argument against renewable energy.
It is evidence that building generation capacity is only part of building a reliable electricity system.
And ignoring that distinction can be expensive.
2. Energy Storage: Who Pays When the Sun Goes Down?
Energy storage is one of the most important technologies supporting renewable integration.
Batteries can store electricity when production exceeds immediate demand and deliver it later.
They can also provide frequency response and other valuable grid services.
And their costs have declined substantially.
IRENA reported that global utility-scale battery storage project costs fell by approximately 93% between 2010 and 2024.
That is genuine technological progress.
But lower battery prices do not eliminate the need to evaluate storage economics.
The relevant questions include:
- How many hours must the storage system deliver electricity?
- How often will it charge and discharge?
- What are its round-trip efficiency losses?
- How quickly will its capacity degrade?
- What replacement costs must be considered?
- How will the system perform during prolonged periods of low renewable output?
- What is the cost of recycling or managing the equipment at the end of its useful life?
A battery designed to shift solar electricity from afternoon to evening is not necessarily an economical solution for covering multiple days or weeks of insufficient generation.
Different storage durations require different technologies and investment strategies.
Pumped-storage hydropower, batteries, thermal storage, demand response, and dispatchable generation may all contribute.
Storage is not free, and neither is reliability.
But the appropriate conclusion is not that batteries are economically unjustifiable.
It is that energy planners must determine the least-cost combination of generation, storage, transmission, and flexibility resources for the actual operating conditions of each electricity system.
3. Transmission and Grid Expansion: Electricity Must Reach the Consumer
A solar project may generate electricity at a competitive cost in a remote region.
But consumers do not necessarily live next to the solar farm.
The electricity must travel through transmission and distribution networks.
New generation projects can require transmission lines, substations, grid reinforcement, and additional system protection and control equipment.
These investments are not unique to renewable energy.
Coal, nuclear, hydropower, and natural gas projects also require grid infrastructure.
However, large-scale renewable expansion can create new geographical and operational requirements when generation is concentrated far from demand centers.
If those costs are excluded from the analysis, the comparison becomes incomplete.
The right question is not whether renewables require transmission investment.
All electricity systems do.
The right question is:
How much additional investment does each generation portfolio require to deliver secure electricity where and when it is needed?
4. Subsidies: Are We Comparing Technologies Under the Same Financial Conditions?
Renewable energy subsidies have played an important role in encouraging technological deployment.
Governments have used tax credits, preferential financing, guaranteed tariffs, auctions, and other support mechanisms to promote renewable electricity.
These policies can accelerate innovation and reduce market-entry barriers.
But public support also exists for fossil fuels and other energy technologies.
Direct financial support, tax advantages, regulated cost recovery, fuel-price interventions, and public infrastructure investment can affect different sources in different ways.
Therefore, comparing subsidized renewable generation with unsubsidized coal—or the reverse—does not produce a fair result.
The appropriate comparison requires consistent assumptions about taxation, financing, public support, carbon pricing, and system boundaries.
But there is an even more important point.
Lazard’s 2026 assessment finds that renewables can remain cost-competitive on an unsubsidized generation-cost basis.
Consequently, subsidies alone cannot explain their competitiveness.
The real controversy is not simply who receives subsidies. It is whether policymakers are presenting comparable costs and clearly explaining who pays for the complete electricity system.
Coal vs. Solar and Wind: The Reliability Question Nobody Should Ignore
Coal-fired power plants have one characteristic that remains important to electricity systems: they can store substantial quantities of chemical energy in the form of fuel. Coal can be transported, stockpiled, and used when electricity generation is required. Unlike solar and wind output, fuel availability is not directly tied to sunlight or wind conditions at the moment electricity is generated.
That provides an operational advantage under certain circumstances.
But coal is not perfectly reliable.
Boilers can trip.
Pulverizers can fail.
Condenser performance can deteriorate.
Fuel supply chains can be disrupted.
Coal-fired power plants also face minimum operating loads, ramp-rate limits, maintenance requirements, and environmental constraints.
In addition, stockpiled coal carries storage, handling, degradation, safety, and working-capital costs.
Therefore, coal should not be described as an unlimited or risk-free source of electricity.
Dispatchability and reliability are valuable, but neither belongs exclusively to coal.
Hydropower with reservoirs, nuclear power, natural gas, geothermal energy, storage, and interconnected electricity systems can also contribute to supply adequacy and system stability.
The technical and economic challenge is finding an appropriate combination.
And that combination depends on geography, resources, infrastructure, emissions objectives, and the characteristics of electricity demand.
Colombia: What Happens When Nature Does Not Follow Our Energy Plans?
Colombia provides an excellent example of why electricity system planning must go beyond the price of individual generation technologies.
The country has historically relied heavily on hydropower.
This provides substantial low-carbon electricity generation during favorable hydrological conditions.
However, dependence on water availability creates exposure to prolonged droughts.
During the 2023–2024 El Niño event, Colombia experienced reduced hydrological inflows and pressure on reservoir levels.
In March 2024, XM, the operator of Colombia’s interconnected electricity system, reported that aggregated reservoir reserves had declined to approximately 33.54% of usable capacity.
Thermal generation became essential to preserve electricity supply.
According to Acolgen’s 2025 review using XM information, Colombia generated approximately 83,273 GWh in 2024, with the following participation:
| Generation source | Share in 2024 |
|---|---|
| Hydropower | 65.5% |
| Thermal generation | 29.4% |
| Solar | 4.0% |
Rounded values; other generation sources account for the remaining share.
During certain days of the crisis, thermal electricity generation represented approximately half of the country’s total output.
Why?
Because electricity demand did not disappear when rainfall declined.
The country needed generation resources capable of complementing hydropower under unfavorable conditions.
This does not mean solar and wind are inappropriate for Colombia.
On the contrary, diversifying the generation portfolio can reduce dependence on a single climatic resource.
Solar generation, for example, can be valuable during some dry periods.
But Colombia’s experience demonstrates something fundamental.
An electricity system needs more than low-cost energy. It needs sufficient energy and dependable capacity under adverse conditions.
And this is precisely why eliminating dispatchable resources without adequately developing replacement flexibility and capacity can create risks.
Energy Density: An Important Advantage for Coal, but Not the Whole Story
Coal has high chemical energy density compared with the energy flux captured by solar panels or wind turbines.
This makes coal practical for storing and transporting substantial quantities of energy.
It is also one reason thermal power plants can maintain relatively compact fuel inventories capable of supporting extended operation.
However, energy density and electricity reliability are not equivalent concepts.
Solar radiation and wind are energy flows rather than stored fuels.
Comparing them directly with the chemical energy content of coal can therefore be misleading unless the comparison clearly defines the system boundary.
Land use, installed capacity, annual generation, capacity factor, storage requirements, and electricity delivery characteristics must be assessed separately.
Coal’s energy density offers logistical and operational advantages.
But it also creates environmental responsibilities.
Combustion produces carbon dioxide and can generate sulfur oxides, nitrogen oxides, particulate matter, and other pollutants.
Mining and ash management also have environmental implications.
For solar and wind, equipment manufacturing, mineral extraction, land requirements, and end-of-life management create different impacts.
A serious energy debate should compare entire systems and lifecycles—not isolated advantages selected to defend a preferred technology.
Critical Minerals: The Environmental and Geopolitical Cost Behind Renewable Technologies
Renewable energy equipment and battery systems depend on substantial quantities of industrial minerals.
Copper, aluminum, lithium, graphite, nickel, and rare earth elements play different roles in electricity networks, storage technologies, turbines, and other equipment.
Not every renewable technology requires every one of these minerals.
For example, solar photovoltaic panels do not intrinsically require lithium batteries to generate electricity.
And not all wind turbines rely on rare-earth permanent magnets.
Nevertheless, expanding renewable electricity and energy storage can increase demand for certain critical minerals.
The IEA’s Global Critical Minerals Outlook 2025 projects that, under its Stated Policies Scenario, lithium demand could increase approximately fivefold by 2040, while graphite and nickel demand could roughly double.
Mineral supply concentration creates additional geopolitical risks.
The challenge is not only how much material is available.
It is also where the materials are mined, processed, and manufactured.
What About Battery Recycling?
Battery recycling is technically possible and already occurs commercially.
However, collection networks, recycling economics, recovery efficiency, and processing capacity continue to develop.
The IEA identifies recycling as an important opportunity to reduce future demand for primary mineral extraction.
But recycling cannot immediately eliminate the need for mining, particularly while installed battery capacity continues to expand.
The same principle applies to all energy technologies.
Coal combustion produces ash and other residuals requiring management.
Renewable technologies create equipment and material flows that must be managed during manufacturing, operation, and retirement.
Different technologies produce different impacts.
The absence of emissions at the point of electricity generation does not mean the absence of environmental impacts across the supply chain.
And these impacts deserve transparent assessment.
Is Keeping Existing Coal-Fired Power Plants More Economical Than Replacing Them?
This may be one of the most important questions in the entire energy transition debate.
A fully depreciated coal-fired power plant and a newly constructed solar farm should not be evaluated as though they were both brand-new investments.
Existing plants already have infrastructure, equipment, transmission connections, and operating personnel.
Some may offer valuable dispatchable capacity during periods of electricity scarcity.
However, they also require fuel, maintenance, environmental controls, and eventual refurbishment or retirement.
Their continued operation may involve significant emissions and future regulatory costs.
The correct economic analysis must therefore distinguish between at least three decisions:
- Continuing to operate an existing power plant.
- Investing in efficiency and emissions-control improvements.
- Replacing the plant or its generation with an alternative electricity portfolio.
Each decision has a different cost structure.
A new renewable project can have a lower generation LCOE while an existing thermal plant retains economic value for capacity adequacy or operational flexibility.
Conversely, an old thermal plant with poor efficiency and high operating costs may be more expensive to retain than replacing its energy and reliability services through other technologies.
The result must be demonstrated, not assumed.
Why Improving Coal Power Plant Efficiency Still Matters
As long as coal-fired power plants continue operating, their thermal performance matters.
Improving heat rate can reduce coal consumption per unit of electricity delivered.
That can lower fuel costs and reduce combustion-related emissions intensity.
Opportunities include improving coal quality control, combustion conditions, boiler thermal performance, turbine efficiency, condenser operation, and auxiliary power consumption.
For existing thermal power plants, these measures can provide measurable improvements without requiring complete plant replacement.
But efficiency improvements should not be confused with eliminating the environmental impacts of coal combustion.
They reduce avoidable losses.
They do not make coal carbon-free.
If a coal-fired power plant must remain in service, accepting avoidable fuel waste is an operational and financial failure.
This is not an argument for preserving every coal plant indefinitely.
It is an argument for making decisions based on actual performance, reliability needs, emissions, and economic value.
Could Nuclear Power Offer a Better Solution for Reliable Low-Carbon Electricity?
Nuclear power deserves more attention in debates about electricity affordability and system reliability.
Unlike solar and wind, conventional nuclear power plants can provide substantial electricity output without depending directly on hourly sunlight or wind conditions.
Nuclear fuel also has extremely high energy density.
During operation, nuclear power plants produce very low direct carbon dioxide emissions.
However, nuclear energy brings its own challenges.
High initial capital costs, construction risks, financing requirements, radioactive waste management, safety regulation, and long project-development timelines must be considered.
The relevant comparison is not whether nuclear technology is inherently superior to renewable electricity.
It is whether nuclear power, renewable generation, storage, hydropower, and other resources can be combined economically to meet the reliability and environmental requirements of a specific electricity system.
Countries with different electricity demand, resources, infrastructure, and financing conditions will reach different conclusions.
There is no universal generation mix that solves every problem.
And that is exactly why simplistic comparisons between coal and renewable electricity can be misleading.
The Real Cost of Electricity: What Should Energy Planners Compare?
Instead of relying on a single LCOE figure, electricity planning should evaluate the cost and value of the complete system.
Important considerations include generation capital costs, fixed and variable operating expenses, fuel costs, plant availability, flexibility, storage, transmission, environmental impacts, and financial risk.
Energy planners should also consider electricity demand patterns, seasonal resource availability, peak demand, and the capacity needed to maintain adequate supply during adverse conditions.
A portfolio that minimizes average generation cost may not minimize total system cost.
Similarly, a portfolio designed solely around dispatchable thermal generation can become unnecessarily expensive, carbon-intensive, or exposed to fuel-price volatility.
The objective should be to achieve the lowest feasible long-term cost while respecting reliability, environmental, and other policy requirements.
Electricity affordability is a system-level achievement, not a marketing claim attached to a particular technology.
Frequently Asked Questions About Renewable Energy Costs vs. Coal
Is Solar Energy Cheaper Than Coal in 2026?
Solar photovoltaic generation is competitive with, and frequently cheaper than, new coal-fired generation on a levelized generation-cost basis. However, the complete cost of an electricity portfolio depends on transmission, flexibility, storage, capacity requirements, and local conditions.
Why Can Renewable Electricity Require Additional Costs?
Variable renewable energy can require investments in grid infrastructure, electricity storage, dispatchable capacity, demand response, and system-control technologies. The additional cost depends on the renewable share and the characteristics of the existing electricity system.
Is Coal More Reliable Than Solar and Wind?
Coal-fired plants can generate electricity independently of immediate sunlight or wind availability, provided fuel, equipment, and other operating conditions are adequate. However, coal plants can experience outages, fuel disruptions, and operating limitations. Reliability must be assessed at the system level.
Do Renewable Energy Subsidies Make Solar and Wind Artificially Cheap?
Subsidies can improve project economics, but modern utility-scale solar and onshore wind can remain cost-competitive without tax subsidies. Meaningful comparisons must use consistent assumptions and recognize that different energy technologies may receive different forms of public support.
Can Batteries Replace Coal-Fired Power Plants?
Batteries can replace some services traditionally provided by thermal plants, especially short-duration energy shifting and rapid-response flexibility. Their ability to replace firm capacity during extended shortages depends on storage duration, charging opportunities, system design, and economic conditions.
Should Existing Coal Plants Be Upgraded Instead of Retired?
The appropriate decision depends on plant efficiency, remaining useful life, reliability needs, environmental obligations, investment costs, and available replacement technologies. Efficiency upgrades can create economic value, but they should be evaluated alongside alternative system investments.
Conclusion: The Ugly Truth Is That We Are Comparing the Wrong Costs
Solar and wind technologies have achieved remarkable cost reductions.
Denying that progress would be technically indefensible.
But celebrating cheap renewable generation while ignoring the cost of delivering electricity reliably would be equally misleading.
Electricity systems are not built to win arguments about individual technologies.
They are built to supply homes, hospitals, factories, industries, and entire economies.
Every hour.
During sunny days.
During cloudy weeks.
During droughts.
And during unexpected operating conditions.
Coal has important dispatchability advantages, but it also carries substantial environmental and operational costs.
Renewable technologies offer low-cost, low-emission generation, but integrating them at scale requires a coordinated approach to flexibility, transmission, and reliability.
Nuclear power, hydropower, storage, and other technologies also deserve evaluation based on what they contribute to the complete system.
The real energy transition challenge is not choosing the most fashionable technology. It is delivering reliable, affordable electricity while reducing environmental impacts.
And that cannot be accomplished through selective cost comparisons.
So, before celebrating the next headline claiming that one source of energy is cheaper than another, ask a more uncomfortable question:
Are we comparing the cost of generating electricity—or the real cost of keeping the lights on?
Because those are two very different conversations.
Burn your fuel, not your money.
Mónica Y. Marín
Energy Efficiency & Power Plant Performance Specialist
References
Schernikau, Lars (2022). The Unpopular Truth. Reference presenting a critical perspective on energy-transition costs; its claims should be evaluated against independent technical and economic sources.
Lazard (2026). Levelized Cost of Energy+ (LCOE+). Official publication.
International Renewable Energy Agency (IRENA, 2025). Renewable Power Generation Costs in 2024. Official report.
International Energy Agency (IEA, 2024). Integrating Solar and Wind: Global Experience and Emerging Challenges. Official report.
International Energy Agency (IEA, 2025). Global Critical Minerals Outlook 2025. Official report.
International Energy Agency (IEA, 2026). Electricity 2026: Flexibility. Official analysis.
XM (2024). Situación actual del sistema en el marco del fenómeno de El Niño. Official statement.
Acolgen (2025). Informe Encuesta de Tendencias. Report.
Bank of America (2023). The RIC Report: The Nuclear Necessity. Historical reference from the original article; interpretations of technology costs should be checked against the original analysis, its assumptions, and more recent evidence.