India's Eight Core Industries

What the Index of Eight Core Industries measures, why these sectors matter for the whole economy, and how economists use the monthly data.

Every month, the government publishes the Index of Eight Core Industries, tracking output in sectors that form the backbone of the economy:

Coal
Crude oil
Natural gas
Refinery products
Fertilisers
Steel
Cement
Electricity

Why they matter

These industries supply inputs to almost every other sector: construction needs steel and cement, factories need electricity, farms need fertilisers.
They make up a large share, around 40 percent, of the weight in the broader Index of Industrial Production (IIP).
Their output signals the health of infrastructure, construction and manufacturing.

Using the data

The core index is released before the IIP, so economists use it as an early indicator of industrial activity.
Steel and cement growth reflects construction and infrastructure spending.
Electricity demand reflects both industry and household activity, and weather.

Features of core industries

Capital-intensive: huge plants and long payback periods.
Energy-intensive and often polluting.
Cyclical: output and profits swing with the economy.
Often dominated by a few large firms or public sector companies.

The monthly signal

When the core index shows cement and steel output jumping, economists infer that construction and infrastructure spending are strong, even before GDP data are released.

Thinking core industries only matter to their own workers

Their output feeds nearly every other sector, making them a key signal of economic health.

Key takeaways

The core index tracks coal, crude oil, gas, refinery products, fertilisers, steel, cement and electricity.
These industries make up around 40 percent of the IIP's weight.
The index is an early indicator of industrial activity.
Core industries are capital-intensive, energy-intensive and cyclical.