The output growth recorded in December is the lowest since July 2017, when these core sectors had witnessed 2.9% expansion.
These eight industries -- coal, crude oil, natural gas, refinery products, fertilisers, steel, cement and electricity -- had witnessed a growth of 5.6% in December 2016.
The output of coal and crude oil sectors contracted 0.1% and 2.1% respectively during the month under review.
Growth in steel and electricity generation slowed to 2.6% and 3.3% respectively in December last year as against 15.9% and 6.4% in the same month of 2016.
Refinery products, natural gas, fertiliser and cement recorded healthy growth last month.
Cumulatively, the growth in the eight core sectors during April-December this fiscal slowed to 4% as against 5.3% in the same period last fiscal.
The growth in key sectors will have implications for the Index of Industrial Production (IIP) as these eight segments account for about 41% of the total factory output.