Discuss the significance of the Index of Core Industries as a leading indicator of industrial performance in India. What methodological changes were introduced in its 2022-23 base year revision?

The Index of Core Industries (ICI), compiled monthly by the Office of the Economic Adviser, DPIIT, measures output of India's key infrastructure industries. Its revised series with base year 2022-23, released on 20 July 2026, makes it both a sharper and a broader barometer of industrial momentum [1].

Significance as a leading indicator

• Advance signal for IIP: core industries carry roughly 40% weight in the Index of Industrial Production basket, and ICI is released earlier — giving policymakers an early read on industrial output [2].
• High-frequency input for policy: monthly volume data on electricity, steel and cement feeds RBI's monetary assessment, fiscal forecasting and market expectations ahead of full IIP release [2].
• Cycle diagnosis: cement, steel and iron ore trends track the construction and investment cycle; refinery and electricity trends proxy energy demand. Combined ICI grew 5.4% year-on-year in July 2026 on the new series [3].
• Upstream–downstream reading: since these industries supply inputs to the wider economy, their slowdown foreshadows stress in manufacturing.

Methodological changes in the 2022-23 revision

• Basket widened from 8 to 9 industries with the inclusion of Iron Ore, reflecting its centrality to the steel and infrastructure value chain [1].
• Steel index now uses gross production data, replacing net production [1].
• Coal index retains only Raw Coal, excluding Coal Middling and Washed Coal, to remove double counting [1].
• Weights derived from the IIP (2022-23) series, whose sectoral weights rest on GVA shares at current prices in 2022-23 [4].
• Back series released for April 2023–May 2026 (38 months), with the old 2011-12 series running in parallel during transition [1].

The revision realigns ICI with the economy's present industrial structure and with the parallel IIP and GDP base-year updates, strengthening India's statistical architecture. Extending the back series and publishing a full methodology note, as MoSPI did for IIP [4], would further improve comparability and public trust in official industrial data.