Renewable Energy Cost and Efficiency Comparison: Which Source Is Best?

Renewable energy is often discussed as if one technology can meet every energy need. In reality, different renewable energy technologies have different costs, performance levels, resource requirements, and applications.

Solar, wind, hydropower, geothermal, and biogas can all contribute to a cleaner energy system, but the most suitable option depends on factors such as location, available resources, energy demand, and how consistently electricity needs to be produced.

Understanding the renewable energy cost and efficiency comparison can help communities, businesses, and policymakers make better decisions. Instead of asking which technology is simply the cheapest or most efficient, it is more useful to consider how each technology performs in a particular situation.

How Should Renewable Energy Technologies Be Compared?

There are several ways to compare renewable energy technologies. One commonly used measure is the levelized cost of electricity (LCOE). LCOE estimates the average cost of generating electricity over the lifetime of a project, taking factors such as construction, operation, maintenance, and financing into account.

Another important measure is the capacity factor. This shows how much electricity a power plant generates compared with the amount it could produce if it operated at full capacity all the time. A higher capacity factor generally means the system produces electricity more consistently.

However, cost and capacity factor do not tell the whole story. Renewable energy technologies should also be considered based on:

• Availability of local natural resources

• Upfront installation costs

• Operating and maintenance requirements

• Scalability

• Reliability and consistency

• Land and infrastructure requirements

• Availability of energy storage

• Potential benefits for local communities

This is why a renewable energy source that is inexpensive in one location may not be the best choice somewhere else.

Renewable Energy Cost and Performance at a Glance

The cost and performance of renewable energy technologies can vary significantly. According to the International Renewable Energy Agency (IRENA), onshore wind had the lowest global weighted-average levelized cost of electricity (LCOE) among newly commissioned utility-scale renewable energy projects in 2024, at around USD 0.034 per kWh. Solar PV followed at USD 0.043 per kWh, while hydropower averaged USD 0.057 per kWh and geothermal around USD 0.060 per kWh. However, cost is only one part of the comparison.

Solar Energy

Solar energy is relatively affordable and highly scalable. It can be installed on rooftops, businesses, farms, and large solar farms, making it suitable for many different applications. Its main limitation is that electricity generation depends on sunlight.

Wind Energy

Wind energy can provide very low-cost electricity in areas with strong and consistent wind resources. However, its performance depends heavily on location, including wind conditions, available land, and access to electricity infrastructure.

Hydropower

Hydropower can provide reliable and flexible electricity where suitable water resources are available. Its potential is more geographically limited, and changes in rainfall, water availability, and environmental conditions can affect generation.

Geothermal

Geothermal energy can provide high and consistent electricity output because it does not depend on daily weather conditions in the same way as solar or wind. However, suitable geothermal resources are concentrated in specific locations, and developing projects can require significant upfront investment.

Biogas

Biogas works differently from many other renewable energy technologies because it produces energy from organic materials such as livestock manure, food waste, and agricultural residues. This makes it particularly relevant for farms and rural communities where organic waste is readily available. Its performance depends on having a reliable and consistent supply of feedstock.

These figures should be viewed as global benchmarks rather than universal prices. The actual cost of renewable electricity can vary depending on location, project size, financing, resource quality, equipment, infrastructure, and local energy needs. This is why the cheapest renewable energy source on a global scale may not always be the most suitable option for a particular community or project.

Solar Energy: Affordable and Highly Scalable

Solar energy has become one of the most accessible renewable energy technologies. Solar photovoltaic (PV) systems convert sunlight directly into electricity and can be installed at many different scales, from rooftop systems to large utility-scale solar farms. One of solar energy's biggest advantages is scalability. A system can be designed for a single household, a business, a community, or a large electricity grid.

Solar PV has also experienced significant cost reductions. IRENA reports that the global weighted-average LCOE of utility-scale solar PV fell by around 90% between 2010 and 2024, reaching USD 0.043 per kWh in 2024. The main limitation is variability. Solar panels only generate electricity when sufficient sunlight is available, meaning energy storage or other generation sources may be needed to provide electricity when solar output is low.

Wind Energy: Low-Cost Power in the Right Location

Wind energy uses turbines to convert the movement of air into electricity. When turbines are installed in areas with strong and consistent wind resources, wind can provide some of the lowest-cost renewable electricity available. In 2024, onshore wind had a global weighted-average LCOE of approximately USD 0.034 per kWh, making it the cheapest source of new renewable electricity in IRENA's global comparison.

However, wind energy is highly dependent on location. Wind speed, terrain, access to transmission infrastructure, and land availability all affect project performance. This means that while wind may be the cheapest renewable energy source based on global average costs, it is not automatically the cheapest option for every community or region.

Hydropower: Reliable but Dependent on Water Resources

Hydropower generates electricity using flowing or falling water. It can provide relatively consistent electricity and, depending on the system, can respond to changes in electricity demand. In 2024, newly commissioned hydropower projects had a global weighted-average LCOE of around USD 0.057 per kWh and an average capacity factor of 48%.

Hydropower can have a long operating life, but suitable sites are limited by geography and water availability. Changes in rainfall, drought, ecosystems, and water demand can also affect the performance and sustainability of hydropower projects. For these reasons, hydropower can be highly effective in the right location but cannot be easily deployed everywhere.

Geothermal Energy: High and Consistent Output

Geothermal energy uses heat from beneath the Earth's surface to generate electricity. Unlike solar and wind, geothermal power can operate continuously when suitable geothermal resources are available.

This gives geothermal energy one of its strongest advantages: consistency. IRENA reported a global weighted-average capacity factor of 88% for newly commissioned geothermal plants in 2024. Its global weighted-average LCOE was approximately USD 0.060 per kWh.

The main challenge is geography. High-quality geothermal resources are concentrated in specific areas, particularly regions with significant underground heat activity. Developing geothermal projects can also require substantial exploration and upfront investment.

Biogas: Energy Production Within a Circular System

Biogas takes a different approach to renewable energy. Instead of relying primarily on natural flows such as sunlight, wind, or water, biogas uses organic materials as an energy resource.

Livestock manure, food waste, agricultural residues, and other biodegradable materials can be processed through anaerobic digestion. This produces biogas, which can be used for cooking, heating, or electricity generation. The remaining digestate can also be used as organic fertilizer. This makes biogas particularly interesting for rural communities, farms, and agricultural areas where organic waste is already available.

Biogas can also provide relatively consistent energy when a reliable supply of feedstock is available. IRENA notes that bioenergy electricity projects can achieve high capacity factors when feedstock supplies are consistent, although performance varies depending on the type and availability of feedstock.

The value of biogas therefore goes beyond the cost of electricity produced. A well-designed system can address waste management, energy access, and nutrient recycling at the same time.

Read more: Biogas Solutions for Rural Communities: Clean Energy from Local Waste

Which Renewable Energy Source Is the Best?

There is no single answer to the question of which renewable energy source is best. If the priority is low-cost utility-scale electricity, onshore wind and solar are highly competitive. If consistent electricity generation is important and suitable resources are available, geothermal or hydropower may be more appropriate. In agricultural communities with abundant organic waste, biogas can provide both energy and waste-management benefits.

The best renewable energy technology depends on the local context. For example, installing solar panels in an area with strong sunlight may make sense, while a farming community with large amounts of livestock manure may benefit more from a biogas system. In some cases, combining technologies can provide a more resilient energy system than relying on one source alone.

Why Circular Energy Systems Matter

Renewable energy is not only about replacing fossil fuels with another way of producing electricity. It can also be part of a broader system that connects energy, agriculture, waste, and local economic activity.

Biogas is a clear example of this approach. Organic waste becomes feedstock for energy production, while digestate can return nutrients to agricultural land. Instead of treating waste and energy as separate problems, the system connects them.

This type of circular energy system can be particularly valuable for rural communities. Local resources can be used locally, reducing waste while creating useful energy and agricultural inputs. The same principle can also be applied through combinations of renewable technologies. Solar, wind, storage, biomass, and other resources can complement one another depending on local conditions and energy requirements.

FAQ: Renewable Energy Cost and Efficiency Comparison

What is the cheapest renewable energy source?

Based on global weighted-average LCOE for newly commissioned utility-scale projects in 2024, onshore wind was the cheapest renewable electricity source at approximately USD 0.034 per kWh, followed by solar PV at USD 0.043 per kWh.

What is the most efficient renewable energy source?

There is no single answer because efficiency can be measured in different ways. If consistency of electricity generation is considered through capacity factor, geothermal can perform particularly well. IRENA reported an 88% global weighted-average capacity factor for newly commissioned geothermal plants in 2024.

Is solar cheaper than wind energy?

Globally, onshore wind had a lower average LCOE than solar PV in 2024. However, actual project costs depend on local resource quality, financing, equipment, land, and infrastructure.

How efficient is biogas energy?

Biogas performance depends heavily on the feedstock, technology, and consistency of organic waste supplies. Bioenergy electricity plants can achieve high capacity factors when feedstock is consistently available.

Which renewable energy source is best for rural communities?

The best option depends on the resources and energy needs of the community. Solar may work well where sunlight is abundant, while biogas can be particularly useful for agricultural communities with a reliable supply of organic waste.

Renewable Energy Choices Depend on Local Context

A renewable energy cost and efficiency comparison shows that no single technology is the perfect solution for every situation. Solar and wind offer highly competitive electricity costs, hydropower can provide reliable generation where water resources are available, geothermal can deliver consistent output in suitable locations, and biogas can turn organic waste into both energy and valuable agricultural resources.

The most effective renewable energy system is therefore not always the one with the lowest cost or highest capacity factor. It is the one that matches the available resources, energy needs, infrastructure, and local conditions.

To explore practical renewable energy, biogas, circular economy, and climate solutions, visit su-re.co and learn how local resources can be transformed into long-term environmental and economic value.