NEW DELHI, Jan 20 (Reuters) - India's infrastructure output (ININFR=ECI), opens new tab grew 3.7% year-on-year in December, its fastest pace in four months, driven by strong cement and steel production, government data showed on Tuesday.

The index, which tracks activity across eight sectors and makes up 40% of the country's industrial production, grew at a revised 2.1% year-on-year growth in November.

Industrial output last grew at a faster pace of 6.5% in August 2025.

Cement output rose 13.5% year-on-year in December as compared to a revised increase of 14.6% in November.

• Steel production grew 6.9% year-on-year in December versus a revised increase of 6.7% a month ago.

• Electricity generation increased 5.3% year-on-year in December versus a revised fall of 1.5% a month ago.

• Crude oil output fell 5.6% year-on-year in December as compared to a fall of 3.2% in November.

• Natural gas production declined 4.4% year-on-year in December as against a drop of 2.5% in November.

• Fertiliser production increased 4.1% year-on-year in December as compared to a growth of 5.6% in November.

• Coal production rose 3.6% year-on-year in December as compared to a growth of 2.1% in November.

• Refinery products output declined 1% year-on-year in December as against a fall of 0.9% in the previous month.

• Infrastructure output rose 2.6% year-on-year in April-December as against a revised growth of 4.5% a year ago.