Core Industries Index set to get an upgrade

1. At a Glance

The Index of Core Industries (ICI), compiled by the Office of the Economic Adviser (OEA), Department for Promotion of Industry and Internal Trade (DPIIT), Ministry of Commerce and Industry, tracks output of infrastructure-linked industries and is a key high-frequency indicator of industrial activity in India [S1].
A revised ICI series with new base year 2022-23 (replacing 2011-12) is set for release, with recalibrated industries and weightages [S1][S2].
The core-industry count is set to rise from eight to nine, with Iron Ore newly included [S3].
Directly relevant to Indian Economy (GS-III) and Economic Survey/IIP-linked Prelims questions on index methodology and base years.

2. Why in the News

The Ministry of Commerce and Industry will release the updated ICI on July 20, 2026, with new base year 2022-23 [S1].
The release will include the provisional ICI for June 2026 along with a back series from April 2023 to May 2026 [S1].
Weights for the ICI (2022-23) series are derived from the weights of the Index of Industrial Production (IIP) 2022-23 series released by the Ministry of Statistics and Programme Implementation (MoSPI) [S1].

3. Background & Evolution

The ICI (also called the "Index of Eight Core Industries") has historically tracked eight core sectors on base year 2011-12=100 [S3].
The Advisory Committee on National Accounts Statistics (ACNAS) recommended FY 2022-23 as the new base year for the next series of GDP, WPI, PPI and IIP [S2].
The WPI (2022-23) series became effective from June 2026 (with data from May 2026 released), and its back series covers April 2023 to May 2026 — the same back-series convention now being applied to ICI [S2].
The revised ICI is being launched in step with this broader statistical base-year revision cycle across national indices [S2][S1].

4. Core Static Facts

Compiling body: Office of the Economic Adviser (OEA), DPIIT, Ministry of Commerce and Industry [S1][S3].
Old base year: 2011-12=100; New base year: 2022-23=100 [S1].
Old composition: 8 core industries — Coal, Crude Oil, Natural Gas, Refinery Products, Fertilizers, Steel, Cement, Electricity [S3].
New composition: 9 core industries — the above eight plus Iron Ore [S3].
Old weightage order (highest to lowest): Refinery Products > Electricity > Steel > Coal > Crude Oil > Natural Gas > Cement > Fertilizers [S3].
Weight in IIP: The eight core industries together constituted 40.27% of the weight of items in the IIP (old series) [S3].
Methodology: New ICI weights derived from IIP (2022-23) weights released by MoSPI, redistributed pro-rata to sum to 100 for the ICI item basket [S1].
Release date & scope: July 20, 2026; provisional ICI for June 2026 + back series April 2023–May 2026 [S1].

5. Multi-Dimensional Analysis

Economic: ICI is a leading indicator feeding into GDP/IIP estimation; a more current base year (2022-23) better reflects the post-pandemic industrial structure, energy mix, and new capacities than the outdated 2011-12 base [S1][S2].
Administrative: Coordination between DPIIT/OEA (ICI) and MoSPI (IIP, base weights) illustrates inter-ministerial statistical harmonisation — a recurring UPSC theme on statistical governance [S1].
Scientific/Technological (Statistical methodology): Introduction of pro-rata weight redistribution and rebasing shows evolving statistical methodology to keep index baskets representative of current industrial output [S1].
Governance: Periodic rebasing (base year revision) across GDP, WPI, PPI, IIP and now ICI reflects a synchronized national statistical system overhaul recommended by ACNAS, improving comparability and policy relevance [S2].

6. Recent Developments (last 12-18 months)

June 2026: New WPI series with base year 2022-23 became effective, with back series from April 2023 to May 2026 [S2].
July 20, 2026 (scheduled): OEA/Commerce Ministry to release revised ICI series with base year 2022-23, along with provisional June 2026 ICI and back series April 2023–May 2026 [S1].
Iron Ore added as a ninth core industry in the revised ICI basket [S3].

7. Prelims Hooks

ICI is compiled by the Office of the Economic Adviser, under DPIIT, Ministry of Commerce and Industry — not MoSPI [S1][S3].
Old ICI base year: 2011-12; new base year: 2022-23 [S1].
New ICI release date: July 20, 2026 [S1].
Old ICI tracked 8 core industries; revised ICI will track 9, with Iron Ore newly added [S3].
The eight original core industries: Coal, Crude Oil, Natural Gas, Refinery Products, Fertilizers, Steel, Cement, Electricity [S3].
Old weightage ranking (highest first): Refinery Products, Electricity, Steel, Coal, Crude Oil, Natural Gas, Cement, Fertilizers [S3].
The eight core industries comprised 40.27% of the IIP weight (old series) [S3].
ICI weights are derived from IIP weights, which are released by MoSPI, not DPIIT [S1].
The back series for the new ICI (2022-23) will run from April 2023 to May 2026 [S1].
The WPI (2022-23) series similarly became effective from June 2026 [S2].
ACNAS recommended 2022-23 as the new base year for GDP, WPI, PPI and IIP series [S2].

8. Mains Relevance

GS-III: Indian Economy — Industrial Policy, growth, statistical indices (IIP, ICI, WPI, GDP), infrastructure sectors.
Syllabus heading: "Indian Economy and issues relating to planning, mobilization of resources, growth, development"; also "Effects of liberalization on the economy, changes in industrial policy."
Possible question stems: 1. "Discuss the significance of periodic rebasing of economic indices such as the Index of Core Industries. How does it improve the accuracy of industrial growth measurement in India?" 2. "Examine the rationale behind the inclusion of Iron Ore in the revised Index of Core Industries. What does this indicate about shifts in India's industrial structure?" 3. "Critically evaluate the coordination between DPIIT and MoSPI in maintaining India's key economic indices."

9. Related Topics to Study Next

Index of Industrial Production (IIP) — source of weights for ICI; core to industrial growth measurement.
Wholesale Price Index (WPI) & base year revision (2022-23) — parallel rebasing exercise, same ACNAS recommendation.
GDP base year revision — part of the same statistical modernization cycle.
National Accounts Statistics / ACNAS — the advisory body driving base-year recommendations.
DPIIT — mandate and role — parent department for ICI and industrial policy.
MoSPI — functions and indices — the ministry providing underlying IIP weights.
Iron & Steel sector in India — relevant given Iron Ore's new inclusion as a core industry.
Ease of Doing Business & industrial statistics reforms — broader context of statistical/administrative modernization.

10. Common Errors / Trap Areas

Confusing the compiling authority — ICI is released by the Office of Economic Adviser under DPIIT/Commerce Ministry, NOT MoSPI (MoSPI only provides IIP weights) [S1][S3].
Assuming ICI still has 8 industries — after the revision it becomes 9, with Iron Ore added [S3].
Mixing up the old base year (2011-12) with the new base year (2022-23) in dates/questions.
Confusing IIP and ICI — ICI is a subset/derivative index using IIP weights, not identical to IIP.
Assuming the weightage order (Refinery Products, Electricity, Steel...) remains unchanged in the new series — the news notes "recalibrated weightages," so the old order should not be assumed to carry over exactly.

11. Sources

[S1] Core Industries Index set to get an upgrade — The Hindu BusinessLine — https://www.thehindu.com/todays-paper/2026-07-18/th_chennai/articleGPIG91UT0-15494794.ece — (tier: 4)
[S2] Govt to release revised Index of Core Industries Series with new base year of 2022-23 — IANS/Prokerala/ANI coverage — https://ianslive.in/govt-to-release-revised-index-of-core-industries-series-with-new-base-year-of-202223--20260717163003 — (tier: 4)
[S3] Index of Eight Core Industries UPSC — Byju's / PIB base data on ICI composition and weightage — https://byjus.com/free-ias-prep/index-of-eight-core-industries/ — (tier: 4)