The incident occurred when the truck was negotiating a narrow wet stretch of road while returning from their work site near Tala Dam at Wangkha in Chukha district at around 8.30 pm on Saturday. Police said 10 workers died on the spot with their bodies found smashed and scattered beyond recognition.
In April, 2014, the two countries had signed a framework agreement on four more JV-model HEPs totalling 2120MW.
India has so far set up three projects - Tala, Chukha and Kurichu - in Bhutan under the Inter-governmental Agreement model.
Three weeks after taking over, Prime Minister Narendra Modi will travel to Bhutan on Sunday on his first foreign visit to demonstrate the "special token of friendship" for the country.
Bhutan's recognition of Bangladesh without waiting for Indian advice was a clever move, but if it did it even before India did, it was a calculated gamble to assert its independence, says T P Sreenivasan.