On 22 June 2026, the Ministry of Commerce & Industry released the Index of Eight Core Industries (ICI) for May 2026. The combined index rose 0.5 per cent (provisional) over May 2025, with Steel, Cement and Electricity recording positive growth while coal, crude oil, natural gas, refinery products and fertilizers contracted. The cumulative growth for April–May of 2026-27 stood at 1.1 per cent.
For a CDS aspirant, the monthly number is the least important part of this release. A single month's figure is never asked in an exam. What is asked — repeatedly — is the architecture behind the number: what the ICI measures, who compiles it, which eight industries it tracks and in what order of weight, and how it connects to the broader Index of Industrial Production (IIP) and to India's industrial growth story. This article builds that high-yield explainer from the ground up.
What the Index of Eight Core Industries actually is
The Index of Eight Core Industries (ICI) is a monthly production-volume index that measures the combined and individual output of the eight industries considered the backbone of the Indian economy. These are the "core" or "infrastructure" sectors — the foundational inputs on which almost all other industrial and economic activity depends. If steel, electricity and refinery products are growing, factories downstream of them tend to grow too; if they stall, the whole industrial chain feels it.
The ICI is therefore not a measure of the whole economy. It is a tightly focused gauge of heavy, foundational industry — the upstream sectors that supply energy, fuel, building materials and metals to everyone else. This is exactly why economists watch it so closely as an early-warning signal.
Who releases it — the institutional map
This is a favourite CDS factual hook, so fix it precisely:
- The ICI is compiled and released by the Office of the Economic Adviser (OEA).
- The OEA sits under the Department for Promotion of Industry and Internal Trade (DPIIT).
- DPIIT is part of the Ministry of Commerce & Industry.
A common trap is to confuse this with the body that releases the IIP. The IIP is released by the National Statistical Office (NSO), under the Ministry of Statistics and Programme Implementation (MoSPI) — a different ministry. So remember the pairing: ICI → Office of the Economic Adviser → DPIIT → Ministry of Commerce & Industry, while IIP → NSO → MoSPI. Examiners love this split because candidates routinely mix them up.
The eight core industries and their weights (in decreasing order)
The single most testable table in this entire topic is the list of eight industries ranked by their weight in the index. The weights are derived from the IIP and scaled to sum to 100 within the ICI. In decreasing order of weight:
- Refinery Products — ~28.04% (by far the largest)
- Electricity — ~19.85%
- Steel — ~17.92%
- Coal — ~10.33%
- Crude Oil — ~8.98%
- Natural Gas — ~6.88%
- Cement — ~5.37%
- Fertilizers — ~2.63% (the smallest)
A clean way to remember the top three — which together carry roughly 66% of the index — is Refinery, Electricity, Steel. The bottom of the table is Fertilizers, the lightest at about 2.63%. Note the counter-intuitive points that examiners exploit: Coal is not the largest (refinery products is), and Cement is small despite its visibility in everyday construction. An easy mnemonic for the eight, in any order, is the official listing — Coal, Crude Oil, Natural Gas, Refinery Products, Fertilizers, Steel, Cement, Electricity — but for ranking questions you must know that Refinery Products tops and Fertilizers trails.
The 40.27% link: ICI inside the IIP
Here is the connection that ties the whole topic together and is the most frequently asked relationship: the eight core industries together account for 40.27 per cent of the total weight of items in the Index of Industrial Production (IIP).
In other words, the ICI is effectively a large sub-set of the IIP. The IIP measures the volume of production across the entire industrial economy — broadly grouped into Mining, Manufacturing and Electricity, and also classified by use into categories like primary, capital, intermediate, infrastructure and consumer goods. The eight core industries make up just over two-fifths of that whole. So when the core sector moves, it pulls a very large chunk of the IIP with it.
This is precisely why the ICI is released before the IIP each month and is read as a lead indicator for industrial production. If you want to learn the broader machinery of national output, growth measurement and the indicators that track them, build the foundation through the CDS economy study material.
Base year 2011-12: what it means and why it matters
The ICI carries the label "Base Year: 2011-12 = 100." Understanding this is non-negotiable for the exam, because base-year questions appear across economics topics — GDP, IIP, WPI, CPI and the core index alike.
A base year is a reference year whose value is fixed at 100, against which every later period is compared. If the ICI for May 2026 reads, say, 167, it means core-sector output is 67% higher than it was in the 2011-12 base year. The base year is chosen to be a relatively "normal" year — without major shocks, droughts or distortions — so that comparisons over time are stable and meaningful.
The ICI's base year was shifted to 2011-12 from the older 2004-05 series, deliberately aligned with the IIP's base year so the two indices stay consistent with each other. Periodically revising the base year matters because the structure of the economy changes: new products appear, old ones fade, and consumption patterns shift. Keeping the base too old makes the index unrepresentative of what the economy actually produces today. (This is the same reasoning behind periodic revisions to the WPI and CPI base years.)
Provisional vs final, and cumulative figures
The release flags May 2026 data as provisional and April 2026 data as final — the previous month's figure gets revised once fuller data arrives from source agencies. This is standard: the provisional number is the first estimate, later finalised. The release also reports a cumulative growth rate (here, 1.1% for April–May 2026-27), which smooths out single-month noise by averaging the financial year so far. For analysis, the cumulative trend is more reliable than any one month — a useful point for tackling statement-based questions that contrast a single month's dip with the year-to-date direction.
Why the core sector is a lead indicator
The deeper economic logic — and the part worth understanding rather than memorising — is why the core sector leads. The eight industries are upstream: they supply the inputs that downstream manufacturing and services consume. Electricity powers factories; steel and cement build them; refinery products and natural gas fuel transport and industry; coal feeds power plants and steel furnaces; fertilizers drive agriculture.
Because these inputs are consumed first, a change in their output anticipates changes further down the chain. A sustained rise in electricity and steel typically signals an industrial pick-up ahead; a slide in core output often precedes a broader slowdown. That early-warning quality is why policymakers, the RBI and analysts treat the ICI as a barometer of economic momentum, read alongside investment, credit growth and the budget stance. To see how the government's own spending and capital-investment decisions feed into this industrial demand, study the government budget chapter.
ICI vs WPI vs CPI: don't confuse the indices
CDS economy questions routinely test whether you can tell India's major indices apart. Keep these distinct:
- ICI (Index of Eight Core Industries): a quantity / production-volume index. It measures how much the eight core industries produce. Released by the Office of the Economic Adviser (DPIIT).
- IIP (Index of Industrial Production): also a production-volume index, but across the whole industrial economy (mining, manufacturing, electricity). Released by the NSO (MoSPI). The ICI is 40.27% of it.
- WPI (Wholesale Price Index): a price index measuring inflation at the wholesale level. Released by the Office of the Economic Adviser (DPIIT) — same office as the ICI, which is a neat linkage to remember.
- CPI (Consumer Price Index): a price index measuring retail inflation faced by consumers. Released by the NSO (MoSPI); it is the RBI's headline inflation-targeting measure.
The crucial divide: ICI and IIP measure output / quantity; WPI and CPI measure prices. Mixing a "production index" with a "price index" is the single most common error in this cluster. For a complete grip on the price side, work through the inflation study material, where WPI and CPI are unpacked in detail.
Reading the May 2026 release like an analyst
With the framework in place, the May 2026 numbers tell a coherent story. The headline rose only 0.5%, dragged down by the largest-weight sector, refinery products (-8.7%), along with coal, crude oil and natural gas. What kept the index in positive territory was strength in Electricity (+8.7%), Cement (+8.4%) and Steel (+5.0%) — three sectors that together carry over 43% of the index. So even though five of eight industries contracted, the weights mattered: heavy positive moves in high-weight electricity and steel, plus fast-growing cement, were just enough to offset the refinery drag. This is the analytical pay-off of knowing the weight table — you can explain why an index moved the way it did, not just report the number.
🎯 Practice MCQs
Q1. The Index of Eight Core Industries (ICI) is compiled and released by: (a) National Statistical Office, MoSPI (b) Reserve Bank of India (c) Office of the Economic Adviser, DPIIT, Ministry of Commerce & Industry (d) NITI Aayog → (c) — the OEA under DPIIT releases the ICI; the NSO (MoSPI) releases the IIP and CPI.
Q2. The eight core industries together account for what share of the weight of the Index of Industrial Production (IIP)? (a) 28.04% (b) 40.27% (c) 50.00% (d) 61.30% → (b) — the ICI makes up 40.27% of the IIP's total weight.
Q3. In the Index of Eight Core Industries, which industry carries the highest weight? (a) Electricity (b) Steel (c) Coal (d) Refinery Products → (d) — Refinery Products, at ~28.04%, is the single largest, ahead of Electricity (~19.85%).
Q4. Which of the following is the correct decreasing order of weights? (a) Electricity > Refinery Products > Steel > Coal (b) Refinery Products > Electricity > Steel > Coal (c) Steel > Refinery Products > Electricity > Coal (d) Coal > Refinery Products > Steel > Electricity → (b) — Refinery Products (28.04) > Electricity (19.85) > Steel (17.92) > Coal (10.33).
Q5. Which industry has the lowest weight in the ICI? (a) Cement (b) Natural Gas (c) Fertilizers (d) Crude Oil → (c) — Fertilizers, at ~2.63%, is the smallest; Cement (~5.37%) is next-smallest.
Q6. Which of the following is NOT one of the eight core industries? (a) Cement (b) Automobiles (c) Fertilizers (d) Natural Gas → (b) — Automobiles is part of the wider IIP/manufacturing but is not a core industry. The eight are Coal, Crude Oil, Natural Gas, Refinery Products, Fertilizers, Steel, Cement, Electricity.
Q7. The base year currently used for the Index of Eight Core Industries is: (a) 2004-05 (b) 2011-12 (c) 2017-18 (d) 2019-20 → (b) — the base was shifted to 2011-12 (=100), aligned with the IIP's base year.
Q8. Which pair correctly matches an index with the kind of variable it measures? (a) ICI — retail prices (b) CPI — industrial production (c) WPI — wholesale prices; ICI — production volume (d) IIP — wholesale prices → (c) — WPI is a price index; ICI and IIP measure production volume, not prices.
📋 How this gets asked (PYQ pattern)
CDS and other competitive papers rarely ask for a specific month's growth figure — that is too perishable. Instead, the core-sector / IIP cluster is mined for stable, structural facts: which body releases the ICI (Office of the Economic Adviser, DPIIT — and the trap of confusing it with NSO/MoSPI for the IIP); the list of the eight industries and "which one is NOT a core industry" (automobiles, textiles and chemicals are classic distractors); weight-ranking questions, especially "which has the highest/lowest weight" (Refinery Products highest, Fertilizers lowest); the 40.27% link between the ICI and the IIP; the base year (2011-12); and distinguishing ICI/IIP (quantity) from WPI/CPI (prices). The 2026 hook is simply that the ICI is back in the news with the May 2026 release — a timely prompt to lock down the weight table, the releasing authority and the IIP linkage, all of which recur year after year. Keep up with releases like this through the daily CDS current affairs.
Preparing for CDS or OTA? The core-sector index, the IIP linkage and the WPI/CPI distinction are guaranteed-return economy topics — easy marks once the weight table and releasing authorities are fixed. Follow our daily CDS current affairs and train with experienced faculty in the upcoming Cavalier courses in Delhi.
✍️ Written by Aditya Tiwari — Economy & current-affairs faculty at The Cavalier. Reviewed by the Cavalier Faculty Desk. The Cavalier, founded by ex-Army officers, has trained NDA/CDS/SSB aspirants since 2001 (Facebook · YouTube).
Source: PIB release, 22 June 2026. Facts cross-verified.