Solar Power: Bright Future, Big Challenges
Solar energy booms due to lower costs and green goals. But issues like patchy supply and land use need solutions for a truly sunny future.
Topics: technology, environment, politics
Example
In 2022, the world's installed solar power capacity passed 1 terawatt. The International Renewable Energy Agency (IRENA) found that the cost of electricity from large solar farms fell about 85% between 2010 and 2020, making it one of the cheapest sources of new power. China installs the most. A Singapore link is Sun Cable's Australia-Asia PowerLink, planned to send up to 1.75 gigawatts of solar and wind power from northern Australia to Singapore through a cable over 4,300 km long. Australia granted environmental approval in August 2024 and Singapore's Energy Market Authority gave conditional approval in October 2024; a final investment decision is expected around 2027.
Key facts
- Global installed solar capacity passed 1 terawatt in 2022.
- IRENA found the cost of electricity from utility-scale solar fell about 85% between 2010 and 2020.
- Sun Cable's planned 1.75 GW Australia-Singapore link received Australian environmental approval in 2024 and conditional approval from Singapore's Energy Market Authority.
Limitations
- Sun Cable is a plan, not a working link: its original company went into administration in 2023 before new owners took over, and it may still not be built.
Evaluations
technology evaluation
Support
An 85% fall in cost in ten years shows how mass production can make a once-expensive technology the cheapest option.
Counterargument
Solar produces nothing at night and less in cloudy weather, so grids need storage or backup to rely on it.
Rebuttal
Battery costs have also fallen fast, and long-distance links like Sun Cable aim to move power from sunny places to where it is needed.
Additional support
A cable over 4,300 km under the sea would be one of the longest power links in the world, a major engineering test.
environment evaluation
Support
Each terawatt of solar replaces large amounts of fossil fuel generation, cutting emissions in the power sector.
Counterargument
Large solar farms use land and need mined materials, and panel waste is a growing problem.
Rebuttal
Solar's land and material costs are real but small compared with the damage from burning coal and gas.
Additional support
Singapore uses floating solar on reservoirs, such as at Tengeh, to save land, showing local solutions to space limits.
politics evaluation
Support
Importing clean power helps land-scarce Singapore cut emissions while diversifying away from imported gas.
Counterargument
Relying on power from another country raises energy security risks if relations or the cable fail.
Rebuttal
Spreading imports across several partners and keeping backup capacity can manage that risk.
Additional support
Sun Cable's original company went into administration in 2023 before tech billionaire Mike Cannon-Brookes's group took it over, showing how fragile mega-projects can be.
Sources
- pv magazine (2022-03-15): World has installed 1TW of solar capacity
- IRENA (2021-06-22): Renewable Power Generation Costs in 2020
- PV Tech (2024-08-21): Australian government approves AAPowerLink project to export solar to Singapore
- Enerdata (2024-10-25): Singapore approves 1.75 GW power import from Australia's SunCable project