New series debut: WPI at 9.7% in May; energy costs drive surge; revamped index expands basket to 957 items
India's Wholesale Price Index (WPI)-based inflation rose to 9.68% in May 2026, driven primarily by a surge in energy costs — the highest reading in the curre...
What Happened
- India's Wholesale Price Index (WPI)-based inflation rose to 9.68% in May 2026, driven primarily by a surge in energy costs — the highest reading in the current cycle.
- The Office of the Economic Adviser (OEA) under the Department for Promotion of Industry and Internal Trade (DPIIT) simultaneously launched a revamped WPI series with a new base year of 2022-23, replacing the previous 2011-12 base year series.
- The new series expands the commodity basket from 697 to 957 items, incorporates renewable energy sources (solar, wind, nuclear) under the Electricity sub-group, and shifts Crude Petroleum and Natural Gas from the 'Primary Articles' group into the 'Fuel & Power' group.
- Analysts anticipate a modest easing in June 2026 as global crude oil prices have shown signs of cooling, though the El Niño-linked monsoon deficit adds upside risk from food prices.
- The government also introduced a parallel Producer Price Index (PPI) network, intended to eventually phase out the WPI over the next five years as the primary wholesale-level price gauge.
Static Topic Bridges
Wholesale Price Index (WPI)
The WPI measures the average change in prices of goods at the wholesale (producer/trader) level — before they reach the end consumer. It captures price movements in bulk transactions between businesses, not retail purchases.
Published by: The Office of the Economic Adviser (OEA), under the Ministry of Commerce and Industry (DPIIT). Released monthly, typically around the 14th of the following month.
Base year history: - Original series: 1952-53 - Revised series: 1970-71 → 1981-82 → 1993-94 → 2004-05 → 2011-12 (old) → 2022-23 (new, effective June 15, 2026)
- Old series (2011-12 base): 697 commodities; Primary Articles: 22.62%, Fuel & Power: 13.15%, Manufactured Products: 64.23%
- New series (2022-23 base): 957 commodities; weights revised to reflect current production patterns using Gross Value of Output (GVO) methodology instead of the old Net Traded Value approach
- Key structural change: Crude Petroleum and Natural Gas moved from Primary Articles to Fuel & Power for analytical coherence; renewable energy (solar, wind, nuclear) added to Electricity sub-group
- Frequency: Monthly; data released with approximately a 5-week lag
Sub-groups under old series for reference (Prelims): - Primary Articles (22.62%): Food Articles (15.3%), Non-Food Articles, Minerals - Fuel & Power (13.15%): HSD, Petrol, LPG, Electricity - Manufactured Products (64.23%): Basic Metals (9.7%), Food Products (9.1%), Chemicals (6.5%), Textiles (4.9%)
Connection to this news: The new 2022-23 base year revises all these weights to reflect the post-pandemic Indian economy, expanding the basket to 957 items and adopting GVO methodology. The May 2026 reading of 9.68% was calculated using this new series on its very first release date.
WPI vs CPI vs GDP Deflator
Three distinct price indices serve different purposes in India's statistical framework:
| Index | Published by | Measures | Base Year | Primary Use |
|---|---|---|---|---|
| WPI | OEA/DPIIT | Wholesale/producer prices | 2022-23 (new) | Producer-level inflation, monetary policy input |
| CPI | MoSPI (NSO) | Retail consumer prices | 2012 | RBI's official inflation target benchmark |
| GDP Deflator | MoSPI | Economy-wide price level | 2011-12 | Nominal to real GDP conversion |
Key Distinctions: - CPI covers services (housing, healthcare, education); WPI does not — WPI is goods-only. - RBI's Monetary Policy Committee (MPC) uses CPI (headline) as its official inflation target (4%, ±2%), not WPI. - WPI is considered a leading indicator — wholesale price changes eventually pass through to retail (CPI) with a lag of 2-3 months. - WPI often diverges from CPI: when global crude prices rise, WPI spikes sharply (high Fuel & Power weight) while CPI may remain more subdued (lower fuel weight in consumer basket).
Connection to this news: The gap between WPI (9.68%) and CPI can widen when global energy costs drive WPI but domestic price controls or subsidies insulate retail consumers. The MPC watches WPI energy components as an early warning for future CPI pressures.
Producer Price Index (PPI) — Introduced Alongside
A Producer Price Index (PPI) measures prices from the seller's/producer's perspective at first point of sale, excluding taxes and transport margins. It is the international standard used by most advanced economies (US BLS PPI, Eurozone). Unlike WPI, PPI captures services sectors too. India's new PPI network, launched June 15, 2026, will run parallel to WPI before eventually replacing it — aligning India's price statistics with IMF/ILO international standards.
Connection to this news: The launch of PPI alongside the new WPI series signals a medium-term transition in how India measures producer-level inflation, improving comparability with global indices.
Key Facts & Data
- WPI May 2026: 9.68% (new 2022-23 base series)
- Primary driver: Energy/fuel costs — global crude oil price surge linked to US-Iran war disruption in the Strait of Hormuz
- New basket size: 957 commodities (vs 697 in old series)
- Old base year: 2011-12 (used for ~13 years)
- New base year: 2022-23 (effective June 15, 2026)
- Weight methodology: Gross Value of Output (GVO) — replaced Net Traded Value
- Key structural change: Crude Petroleum & Natural Gas reclassified from Primary Articles → Fuel & Power
- New additions: Solar power, wind energy, nuclear power under Electricity sub-group
- Publishing body: Office of the Economic Adviser (OEA), DPIIT, Ministry of Commerce & Industry
- PPI network: Introduced simultaneously; intended to replace WPI within ~5 years
- June 2026 outlook: Analysts expect modest moderation as global energy prices cool, but monsoon-linked food risk adds uncertainty