Overview
The WPI will shift its base year from 2011‑12 to 2022‑23. Simultaneously, the Ministry of Commerce & Industry will publish new series of PPI, including Output, Input and Service variants. The revised series will be released on 15 June 2026 at 12:00 noon.
Key Developments (Bullet Points)
- Base year of WPI moved to 2022‑23.
- New OPPI, IPPI and Service PPI for seven services (Banking, Securities, Insurance, Pension Funds, Railways, Air‑Passenger, Telecom) will be released.
- WPI coverage expands from 697 to 957 items, adding renewable energy (solar, wind) and nuclear electricity.
- Methodology shifts to GVO‑based weights instead of net‑traded value.
- Computation adopts a chain‑linked short‑term formulation and ‘Targeted Mean Imputation’ for missing data.
- Transition plan aligns with IMF best practices.
Important Facts
• The revised WPI series will be published for five years, after which it will be discontinued.
• Both OPPI and IPPI are compiled monthly; the first provisional data will cover May 2026 with back‑series from April 2023.
• Service PPI, compiled quarterly, will be released for Q4 2025‑26 (provisional) together with earlier quarters dating back to Q1 2023‑24.
• All three indices – WPI, Output PPI and Service PPI – are based on Basic Price. The Input PPI uses the purchaser’s price because firms buy inputs from the market.
Relevance for UPSC
Understanding the shift from WPI to PPI is crucial for GS‑3 (Economy) as it reflects India’s move towards internationally comparable price statistics. The change affects inflation measurement, price‑escalation clauses in contracts, and fiscal planning. Knowledge of the new methodology – especially the use of GVO for weights and chain‑linked computation – helps answer questions on statistical reforms and data reliability.
Moreover, the inclusion of renewable energy items aligns with the government’s clean‑energy agenda, linking to GS‑2 (Polity) and GS‑3 (Environment‑Economy) topics on sustainable development.
Way Forward
Stakeholders are given a five‑year window to migrate from WPI‑based contracts to PPI‑based ones. The Ministry will monitor data quality through the experimental Input PPI and expand the Service PPI basket as more administrative data become available. Aspirants should track subsequent releases to gauge the impact on inflation trends and policy decisions.