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Relevance: GS Paper III — Indian Economy (Growth, Indices, Statistical Reforms) Source: MoSPI / PIB, June 2026

1 · What happened

India’s factory output, tracked by the Index of Industrial Production (IIP), grew by 5.1% in May 2026 compared to the same month last year. This is a good jump up from the 4.9% growth seen in April. Electricity and manufacturing drove this rise, while mining remained sluggish.

But the bigger story is how we are measuring this. The Ministry of Statistics and Programme Implementation (MoSPI) just announced two massive upgrades to the IIP: they updated the “base year” from 2011-12 to a much more recent 2022-23, and they swapped out an old inflation tool (WPI) for a sharper, more accurate one called the Output Producer Price Index (Output PPI).

2 · Why these changes matters

The IIP measures the physical volume of goods our factories make. To do this, it compares today’s output to a fixed “base year”. When that base year gets too old (like 2011-12), the index stops reflecting what modern India actually produces. This new 2022-23 update fixes that gap.

Fresh Reference Point
Base Year: 2022-23
We’ve ditched the outdated 2011-12 base. The new basket of goods better represents what modern factories are making today. It also aligns perfectly with our newly revised GDP base year.
A New Sector Added
Beyond just three pillars
Previously, IIP only looked at Mining, Manufacturing, and Electricity. Now, a fourth crucial sector is included: Water Supply, Sewerage and Waste Management (which grew a healthy 5.5% in May).
Better Math
Dropping the WPI
To calculate real growth, we must strip away inflation. The old tool (WPI) included taxes and transport costs, muddying the data. The new Output PPI tracks the exact price the factory gets at the gate, giving a much cleaner picture about the production.
The Weak Link
Mining struggles
While other sectors boomed, mining actually shrank by 1.6% in May. This marks its fifth straight month of decline, hinting at roadblocks in getting raw materials like coal and iron ore out of the ground.

  • Sector Scorecard (May 2026): Electricity grew by 9.9% while the Manufacturing grew by 5.5%.
  • People are buying goods: Production of consumer durables (like cars and fridges) jumped 7.2%. Importantly, growth was seen across 16 of the 23 manufacturing groups, meaning the boom is widespread, not just limited to one or two industries.

UPSC Prelims Quick Facts
National Statistical Office (NSO) The government body (under MoSPI) responsible for releasing the IIP data every single month.
Use-based classification The IIP also groups goods by how they are used: Primary, Capital (machinery), Intermediate, Infrastructure, and Consumer goods.
Eight Core Industries The heavy lifters of the economy: Refinery products, Electricity, Steel, Coal, Crude Oil, Natural Gas, Cement, and Fertilizers. They make up roughly 40% of the entire IIP weight.
Deflator A mathematical tool used to remove the illusion of inflation. It ensures we measure the actual number of goods produced, not just higher price tags.
Data Modernisation India is actively updating its math: GDP and IIP now use 2022-23 as a base, CPI uses 2024, and the PPI has been introduced to replace the clunky old WPI.

MCQ Practice
Q. Consider the following statements regarding the newly revised Index of Industrial Production (IIP):

  1. It now uses 2022-23 as its base year and is released monthly by the National Statistical Office (NSO).
  2. It relies on the Wholesale Price Index (WPI) to adjust for inflation (as its deflator).
  3. It has expanded to include a new, fourth sector: Water Supply, Sewerage and Waste Management.

Which of the statements given above is/are correct?
(a) 1 and 2 only    (b) 2 and 3 only    (c) 1 and 3 only    (d) All of the above

Answer: (c) 1 and 3 only

  • Statement 1 is Correct: The new series is firmly anchored to the 2022-23 base year and managed by the NSO.
  • Statement 2 is Incorrect (UPSC Trap): The government explicitly dropped the WPI for this calculation. It now uses the sharper Output Producer Price Index (Output PPI) as its deflator.
  • Statement 3 is Correct: The old IIP only had three sectors. The new update officially brings in Water Supply, Sewerage, and Waste Management as the fourth main pillar.
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