Detailed Analysis: India’s Core Sector Growth Slows to 3% in September 2025
The slowdown in India's Index of Eight Core Industries (ICI) growth to a three-month low of 3% in September 2025 was primarily due to a sharp decline in the Energy Segment, which offset robust performance in key infrastructure sectors like steel and cement.
1. How the Slowdown Occurred (The Mechanics)
The core sector comprises eight industries—Coal, Crude Oil, Natural Gas, Refinery Products, Fertilisers, Steel, Cement, and Electricity—which collectively hold a significant weight of 40.27% in the overall Index of Industrial Production (IIP).
The slowdown happened because four of the eight constituent sectors—all from the energy/fuel segment—reported a contraction (negative growth):
| Core Sector (The Drag) | September 2025 Growth (Year-on-Year) |
| Natural Gas | -3.8% (Worst contraction) |
| Refinery Products | -3.7% |
| Crude Oil | -1.3% |
| Coal | -1.2% (A reversal from 11.4% growth in August) |
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The Counterbalancing Force (The Support): The weakness was partially contained by strong double-digit growth in the steel sector, reflecting continued robust infrastructure and construction activity:
| Core Sector (The Support) | September 2025 Growth (Year-on-Year) |
| Steel | +14.1% (Best performance, third consecutive month of double-digit growth) |
| Cement | +5.3% |
| Electricity | +2.1% |
| Fertilisers | +1.6% |
Export to Sheets
In essence, the decline in the heavily weighted fuel and energy sectors was large enough to pull the overall index down to 3%, despite a strong cushion provided by the steel and cement industries.
2. When the Growth Rate Was Recorded (The Context)
The data puts the slowdown in context both month-over-month and cumulatively:
When it fell: The 3% growth rate is the lowest in three months, falling significantly from the upward-revised 6.5% growth recorded in August 2025.
Year-Ago Comparison: It was still slightly better than the 2.4% growth registered in September 2024.
Cumulative Performance: The cumulative growth rate for the first half of the fiscal year (April to September 2025-26) stands at 2.9% (provisional), which is slower than the 4.3% recorded in the corresponding period of the previous year. This suggests a broader softening trend in industrial activity throughout the first six months of the financial year.
3. Conclusion and Key Implications
The September 2025 data points to a dualistic pattern of growth within the Indian industrial sector, characterized by:
Infrastructure Strength: Sectors driven by government capital expenditure and construction, primarily Steel and Cement, continue to show resilience and strong expansion.
Energy/Mining Weakness: The fuel-related and mining sectors are struggling, with deep contractions that reflect lower demand or production constraints in these core areas.
Impact on IIP: As the Core Sector accounts for over 40% of the Index of Industrial Production (IIP), its weak performance at 3% in September is expected to moderate the overall industrial production numbers, which will be released later in the month.
Economists have noted that the continued robust expansion in the steel sector was the primary factor preventing an even more severe outcome for the overall core industries during September. The volatility highlights challenges in certain foundational segments of the economy.