* Coal: Coal production, excluding coking coal.
* Crude Oil: Total crude oil production.
* Natural Gas: Total natural gas production.
* Refinery Products: Total refinery production in terms of crude throughput.
* Fertilizers: Production of fertilizers.
* Steel: Production of alloy and non-alloy steel.
* Cement: Production of cement by large plants and mini plants.
* Electricity: Actual electricity generation from thermal, nuclear, hydro sources, and imports from Bhutan.
These eight core sectors have a combined weight of 40.27% in the Index of Industrial Production (IIP), which is a key indicator of the overall health of the Indian economy. The Index of Eight Core Industries (ICI) is prepared every month and released by the Office of the Economic Adviser (OEA), Department for Promotion of Industry and Internal Trade (DPIIT), and Ministry of Commerce & Industry.
The current weightage of the eight core industries is:
1 * Petroleum Refinery Products (28.04%)
2 * Electricity (19.85%)
3 * Steel (17.92%)
4 * Coal (10.33%)
5 * Crude Oil (8.98%)
6* Natural Gas (6.88%)
7* Cement (5.37%)
8* Fertiliser (2.63%)
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