An industrial index is useful only when its comparison period, base year and provisional status are clear.
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Qaskme editorial answer
The official release gives September 2026 Index of Core Industries growth as 7.9% compared with September 2025. It is a provisional year-on-year figure, not a claim that production increased 7.9% from August to September.
Read this release using its 2022–23 base year and current coverage. Its table includes iron ore as well as coal, natural gas, crude oil, refinery products, fertilisers, steel, cement and electricity. Applying an older eight-industry list would misdescribe this particular series.
Growth was uneven: iron ore, electricity, coal, refinery products, cement and steel increased, while fertilisers, natural gas and crude oil declined. The overall index combines industries using weights, so it is not a simple average of their percentage changes.
The release also reports April–September cumulative growth of 5.1% and August’s final growth of 5.9%. When comparing reports, keep provisional and revised figures separate. These production data can inform an economic discussion, but do not by themselves establish an investment recommendation or a specific company’s prospects.
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