Key experts in DESL
  • 2 Doctoral experts in energy efficiency/engineering services
  • 14 post-graduates skilled in energy efficiency/engineering services
  • 2 post-graduates skilled in finance
  • Over 40 Qualified engineers in energy efficiency/engineering services
  • 4 Accredited Energy Auditors;
    7 Certified Energy Auditors;
    3 Certified Energy Managers
Key Personnel
Dr. G C Datta Roy, Founder CEO & Advisor   Mr. Rajmohan Rangaraj, CEO DESL

Born in 1945 in present Bangladesh, Dr. Roy graduated in electrical engineering with honours from Jadavpur University in 1965. He obtained PhD from BITS, Pilani in 1995. He had attended "The Executive Programme" at Darden Business School, University of Virginia, USA in 1990.


Dr. Roy was the founder CEO of DESL and helped it to become one of the most respected energy consulting firms in the country, with project executions in over 25 countries.


Dr. Roy has been awarded as the 'Energy Professional Developer of the year' by India chapter of AEE, USA in 2010 and as the 'Sustainability leader of the year' by Parivartan Sustainability Outlook in 2012 for his immense contribution in promoting energy efficiency business in the country. He is a member of several international and national committees (including government and key trade/industry associations). He has several technical publications to his credit.


Born in 1956, Rajmohan graduated in chemical engineering with distinction and university rank from Annamalai University in 1978. He obtained his post-graduation from the same university in the year 1980. He successfully completed a 'two-year post graduate certificate programme in energy management' conducted by NPC, India in 1984. He is a CEA by BEE, India, ex-CMVP by EVO, ex-KQP by NEA, Singapore.


Rajmohan has led in successfully carrying out over 1,500 energy efficiency, water efficiency, renewable energy, waste minimization, shared savings and guaranteed savings performance contract assignments in industrial, commercial and municipal sectors in over 15 countries including the United States of America, South Africa, Kenya, Singapore and South Korea.


Rajmohan has several technical publications including one 'patent' to his credit. He has participated in numerous seminars / workshops in the area of energy efficiency as a guest speaker.


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