To what factors can the recent dramatic fall in equipment costs and the tariff of solar energy be attributed? What implications does the trend have for thermal power producers and the related industry?
Subtopic: Sustainable Development · Solar economics and energy transition
How to structure your answer
Introduction: Note that solar module costs and auction tariffs have collapsed to record lows.
Body: (1) Factors behind the fall — technology, manufacturing scale, finance, policy/auctions; (2) implications for thermal producers — lower utilisation, stranded-asset risk; (3) implications for related industry — coal, equipment makers, storage and grid.
Conclusion: A managed, just transition rather than abrupt disruption.
Written within the word limit
248 words · target 250 words · 11 min
Introduction: Solar module prices have crashed — from a few dollars per watt at the start of the last decade to a small fraction of that today — and competitive auction tariffs in India have touched record lows near two rupees a unit, deeply reshaping the power market.
Factors behind the fall:
- Technology: higher-efficiency crystalline-silicon cells, bifacial modules and single-axis trackers raise the capacity utilisation factor and squeeze cost per unit of output.
- Manufacturing scale: massive global over-capacity, automation and the learning-curve effect keep cutting the per-watt price year after year.
- Finance and policy: cheaper borrowing, transparent reverse auctions run through agencies like the Solar Energy Corporation of India, and ready-to-build solar parks remove land and clearance risk, letting developers bid aggressively.
Implications for thermal producers: Because cheap daytime solar is dispatched first, coal plants run for fewer hours, their plant load factors drop, and older, costlier units face stranded-asset risk and stressed bank loans. Fresh investment in new thermal capacity slows sharply, and some plants survive only by supplying flexibility and night-time balancing.
Implications for related industry: Coal mining and railway freight demand soften over time; thermal equipment makers pivot toward solar modules, inverters and balance-of-system supply; and demand surges for batteries, pumped-storage hydro and stronger transmission grids to firm up variable solar.
Conclusion: The trend pushes the system toward clean, low-cost power, but firm capacity and storage are still needed — so the goal is a managed, just transition that protects workers and grid reliability rather than abrupt closure.
What an examiner expects to see
- Module prices fell from ~$2.4/watt (2010) toward ~$0.10/watt, driven by learning-curve and over-capacity
- Indian solar auction tariffs hit record lows around Rs 2/kWh
- Bifacial modules and single-axis trackers raise the capacity utilisation factor
- Reverse auctions via SECI and large solar parks cut developer risk and price
- Low cost of borrowing and aggressive competitive bidding pushed tariffs down
- Cheap solar lowers coal plant load factors, raising stranded-asset and NPA risk
- Coal mining and rail freight demand soften; thermal equipment makers pivot to solar
- Rising need for battery storage, pumped hydro and grid strengthening to firm up solar
Concrete cases, schemes and judgments
- SECI reverse auctions reaching ~Rs 2/kWh solar tariffs
- Solar parks such as Bhadla (Rajasthan) and Pavagada (Karnataka)
- Bifacial modules with single-axis trackers
- Solar-plus-storage tenders bundling 4-hour battery capacity