The expansion in power generation sector stood at 7.4 per cent compared to 4.2 per cent in the year-ago month.
Mining growth was at 3.2 per cent in May as against 5.8 per cent in the corresponding month of the last fiscal.
However, there was a slowdown in the manufacturing sector, which grew at 2.5 per cent in May compared to 3.6 per cent a year ago.