Air pollution cut India’s solar power output by 9.6% in 2023: study, Pg12

The Findings

1. Aerosols reduced India's solar power generation by 9.6% in 2023, equivalent to about 15 TWh of electricity.
    
2. The global average loss in solar generation due to air pollution was 5.8%, significantly lower than India's losses.
    
3. Between 2017 and 2023, India lost an average of 74 TWh annually because of pollution-related reductions in solar output.
    
4. India's losses amounted to nearly one-third of the electricity generated by newly added solar capacity during the period.
    
5. China recorded the highest absolute loss at 61.3 TWh in 2023, though its proportional loss was lower than India's.

Why It Matters

1. Solar energy is central to India's clean-energy transition and net-zero ambitions.
    
2. Air pollution directly reduces the efficiency of solar panels by limiting incoming sunlight.
    
3. Lower solar generation increases dependence on conventional fossil-fuel-based power.
    
4. Pollution therefore imposes both environmental and economic costs on the energy sector.

The Core Challenge

1. Sulphates and carbon-based aerosols scatter and absorb sunlight before it reaches solar panels.
    
2. Northern India experiences the highest solar-generation losses due to persistent air pollution levels.
    
3. India's aerosol-related solar losses remained largely unchanged between 2013 and 2023.
    
4. The government weakened FGD installation targets in 2025 despite the role of emissions in worsening aerosol pollution.

Broader Implications

1. The study highlights the interconnected nature of air quality and renewable energy performance.
    
2. Achieving energy transition goals requires tackling both emissions reduction and clean-energy expansion.
    
3. Pollution control measures can deliver a dual benefit of improved public health and higher solar output.
    
4. The findings strengthen the case for integrating environmental policy with energy planning.

Key Concepts

• Aerosols → Fine atmospheric particles such as sulphates, soot and dust that affect air quality and sunlight transmission.
   
• Terawatt-hour (TWh) → Unit of energy equal to one trillion watt-hours, commonly used to measure electricity generation.
   
• Flue-Gas Desulphurisation (FGD) → Technology used to remove sulphur dioxide emissions from coal-fired power plants.
   
• Solar Photovoltaics (PV) → Technology that converts sunlight directly into electricity using semiconductor materials.

The Takeaway

Air pollution is not only a public health challenge but also an energy transition challenge, reducing the effectiveness of one of India's most important clean-energy solutions.