Solar Power: Advantages, Disadvantages, and Solutions

Solar energy is the fastest-growing energy source, with the National Renewable Energy Laboratory (NREL) projecting that 60-80% of U.S. electricity could be supplied by wind and solar energy by 2035.

However, like all energy sources, many advantages and some disadvantages of solar energy exist. In this article, we’ll cover the main solar power pros and cons and provide specific solutions for the challenges.

Advantages of Solar Energy

Solar energy has many benefits that outweigh the disadvantages for both residential and utility-scale systems. Even some of the disadvantages have solutions that can be adopted. Here are the main pros:

1. Renewable and Reduces Carbon Emissions

Solar power is a renewable resource, unlike fossil fuels which are finite. While producing and installing solar panels causes some emissions, operating the panels produces zero emissions. In the long run, solar power produces fewer carbon emissions compared to fossil fuels. According to the World Nuclear Association, fossil fuels account for around 17 times more emissions than solar PV (utility-scale).

2. Can Offset Electricity Bills

Solar panels, especially with an off-grid solar system, reduce reliance on the grid, helping save money on electricity.

3. May Gain Profit Through Solar Renewable Energy Credits

Solar Renewable Energy Credits (SRECs) are certificates that can be received in some US states and sold for money. For each 1,000 kWh (kilowatt-hours), you can earn 1 SREC. Some utility companies are required to use a certain amount of their energy from renewable sources and are willing to buy SRECs from solar system project owners. States where SRECs are available include:

• ​New Jersey
• ​Massachusetts
• ​Pennsylvania
• ​Maryland
• ​District of Columbia
• ​Ohio
• ​Delaware
• ​North Carolina
• ​California
• ​Illinois
• ​Virginia

4. Stimulates Economic Growth

Utility-scale projects produce economic development advantages due to the creation of wide-ranging job opportunities. The Interstate Renewable Energy Council (IREC) found that the solar industry accounted for nearly 280,000 jobs at the end of 2023. The International Renewable Energy Agency (IRENA) estimated that renewable energy jobs, including solar PV, could reach 42 million by 2050 worldwide.

5. Low Maintenance Costs

Solar panels don’t have moving parts that could wear out, so they require little maintenance. Regular cleaning and performance monitoring are recommended. For example, NREL found that solar panels can lose as much as 7% of energy in some parts of the US and as much as 50% in the Middle East due to dust annually. Gentle cleaning a few times per year is usually sufficient.

6. Helps Gain Electricity in Any Climate

Solar panels may be disrupted by weather changes, such as cloudy days, but they’re suitable for use in any climate, including winter. If snow is cleaned off, the sun can reflect off the snow and enhance the amount of light that reaches the panel. Solar panels could lose around 0.43% of their power with every degree Celsius above 25°C (77°F), so lower temperatures can even be beneficial.

7. May Improve Home Value

For residential systems, solar panels are considered a valuable upgrade, helping increase property value. According to research by Zillow, homes with solar panels tend to sell for around 4.1% more on average than those without them. This translates to an additional $9,274 on average, though other factors such as location and system size also play a role.

Disadvantages of Solar Energy

While the pros outweigh the cons, there are still some disadvantages to consider:

1. Technological Limitations in Photovoltaic Efficiency

Solar panels cannot convert all sunlight into electricity—this is known as conversion efficiency. Most panels have 21% efficiency. Another factor limiting conversion efficiency is recombination, where energy turns into light or heat instead of electricity.

Solutions to Improve PV Efficiency

• ​Bifacial solar panels: These have cells on their underside to catch reflected light and can have more than 56% higher efficiency than monofacial panels under favorable conditions.
• ​Multi-junction PV cells: These can increase efficiency to more than 45%, though manufacturing costs and material availability need to be addressed before commercial use.

Another issue is solar intermittency—the inconsistency of solar energy generation due to daylight hours and weather conditions. Users need other power sources after sunset, and utilities cannot rely on solar alone.

Solutions to Improve Solar Reliability

• ​Net metering: Allows users to sell unused energy back to the grid and receive credits for use after dark.
• ​Off-grid solar systems: Store enough energy to cover unsuitable weather conditions but require large battery tanks, resulting in higher initial costs.
• ​Battery technology improvements: Initiatives like Battery 2030+ aim for more efficient, cost-effective, and safer batteries. Smart energy management software can also optimize electricity use.

2. Geographic Variations in Solar Intensity

Solar efficiency depends on geographic location. Closer to the equator, more solar radiation is received. In areas with low solar radiation, panels may not produce as much energy. Pollution, foliage, elevation, and other factors also affect solar energy production.

Solutions for Solar Intensity Limitations

• ​Solar tracking technology: Allows panels to adjust based on daily and seasonal changes in the sun’s location, maximizing exposure.
• ​AI-powered software: Performs advanced site analysis and optimizes placement, location, and angle of panels for maximum yield.

3. Cost Competitiveness with Other Energy Sources

Solar energy is cost-effective in the long run, but upfront costs are higher. Users may still pay for supplemental power at times.

Estimated cost per watt (no storage) based on PV system type (U.S. Department of Energy):

• ​Utility-scale 100 MWDC: $0.98 – $1.12 per Watt
• ​Residential rooftop 8 kWdc: $2.74 – $3.15 per Watt

An average-sized residential solar system could cost between $21,900 to $25,200, while utility-scale systems could cost $98-112 million, excluding storage systems.

Solutions for Cost-Effectiveness

• ​Take advantage of federal and state incentives to lower initial installation costs.
• ​The U.S. Department of Energy regularly updates funding opportunities for new projects.

4. Land Use Requirements

Solar panels require a large area for energy production. Large-scale solar farms could require 3-5 acres per MW, compared to 1 or less for coal or natural gas plants. This raises concerns about agriculture, wildlife, and soil health.

Solutions for Land Use Concerns

• ​Optimizing solar plant size: Use specialized software to measure potential yield and minimize area while maximizing output.
• ​Agrivoltaics: Integrate solar into farmland without disrupting crop production, using raised mounting systems and shade-growing crops.
• ​Floating-solar systems: Install panels on water to reduce land usage and benefit from natural cooling.

5. Solar Panel Life Cycle and Environmental Impact

Solar panels degrade over time. Most retain 80% of their electricity production capacity after 30 years, but recycling causes concerns. Some panels contain hazardous materials like lead or cadmium. Mining, manufacturing, and transporting panels also produce pollution. Large-scale solar plants can contribute to the heat island effect, raising local temperatures.

Solutions for Reducing Environmental Impact

• ​Research is advancing in solar panel recycling, including reuse of silicon from old panels.
• ​Efforts are underway to increase the lifespan of solar panels to 50 years or more by experimenting with different technologies and packaging.

A Promising Future

With the impressive growth of solar energy in recent years, the future looks promising. Researchers and companies are actively addressing many of the problems slowing the solar PV industry, and governments continue to offer incentives and create policies that focus on making clean energy more accessible to everyone.