Saikia confirmed to PTI that she has resigned but did not give any reason for taking the step.
The Energy and Resources Institute too remained tightlipped about it.
"Yes, it is true that I have resigned," Saikia told PTI over phone. "No," she said, when asked whether she had cited any reason for tendering her resignation.
Sources said Saikia resigned on Monday after which TERI is learnt to have reconstituted the committee.
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A case of sexual harassment was registered against Pachauri, a Nobel peace prize recipient, on February 13 this year.
TERI governing council had on July 23 appointed Dr Ajay Mathur, currently the director general of Bureau of Energy Efficiency (BEE), as its Director General.
Pachauri had also stepped down as chair of the United Nations' Intergovernmental Panel on Climate Change (IPCC) and Prime Minister's Council on Climate Change following the alleged incident.
He was recently allowed by a Delhi court to travel to Kazakhstan for a conference on climate change.