HeidelbergCement India Ltd reported a significant increase in net profit to Rs 31.47 crore for the December quarter, driven by reduced operating costs. Its total revenue also saw a 12.4% growth. The company attributed this to a 10% increase in volume and 2% price hike. Operating costs per tonne decreased by 2.4% due to lower coal and petcoke costs. However, total expenses rose by 6.43%.