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Technical Working Group


The Rules Change Panel has a Technical Working Group (TWG) to assist it in reviewing technical changes to the Market Rules.

The TWG is responsible for examining the on-going evolution of the dispatch and price discovery process, balancing economic, financial and technical considerations in creating more efficient wholesale electricity markets.

The TWG consists of eight members:

Chairperson nominated by EMC

Poa Tiong Siaw
Poa Tiong Siaw heads the Market Administration Department which advises the Rules Change Panel through economic analysis and proposals to enhance efficiency in the wholesale electricity market. Prior to this appointment, he headed the Market Assessment Unit which is responsible for the compliance, surveillance and dispute resolution functions of the market. Tiong Siaw joined EMC as senior economist in Feb 2003 and worked on evolving the wholesale electricity market. He went on head the Market Assessment Unit in 2009. Before joining EMC, he was senior economist in the economics division of the Ministry of Trade and Industry, where he conducted and oversaw economic analyses to support economic and trade policies. Tiong Siaw also worked as a treasury economist for DBS Bank and was involved in economic, currency and interest rate-related research. He holds a Master of Social Sciences degree from the National University of Singapore and a Bachelor of Business degree from the Nanyang Technological University.

Four experts nominated by market participants (excluding the Transmission Licensee)

Calvin Quek
Calvin Quek is the Assistant Vice President, Trading & Portfolio Management of Tuaspring Pte Ltd.  He manages the trading team’s day to day electricity, gas market operations and hedging portfolio. He had been instrumental in setting up Tuaspring’s electricity futures trading desk, electricity and gas management systems during the development phase of the power plant. He have also played a lead role in helping Tuaspring secure both commissioning gas as well as long term gas supply. He holds a Bachelor degree in Electrical & Electronic Engineering from Nanyang Technological University, Singapore.

Desmond Sim
Desmond Sim currently holds the position of Senior Manager in Prompt Trading of Senoko Energy Pte Ltd. With 9 years experiences in the both gas and electricity markets, he is responsible in managing market optimisation strategies and daily trading operations, as well as evaluating consultation papers and market rule changes. Desmond Sim graduated with a Bachelor degree in Engineering (Mechanical) from Nanyang Technological University, Singapore.

Lim Xingyi
Lim Xingyi is the Manager (Trading & Regulation) of Tuas Power Generation Pte Ltd. She manages regulatory matters for the company through the evaluation of policies and consultation papers issued by the government, regulator and market design panel etc. She is also involved in performing electricity trading and fuel optimisation, market analysis and modelling. Xingyi graduated with a Bachelor degree in Chemical Engineering from National University of Singapore.

One person nominated by the Transmission Licensee

Chu Xiao En
Chu Xiao En currently heads the Transmission Planning section of SP PowerGrid Ltd. She manages a team responsible for the planning of the transmission network, comprising the 66kV, 230kV and 400kV network, in order to meet system demand growth, connect customers and generators as well as replace aging assets. Xiao En holds a Bachelor of Engineering degree in Electrical & Electronic Engineering from Imperial College London, and a Masters of Science degree in Electrical Engineering from Stanford University.

One person nominated by the Power System Operator (PSO)

Loh Poh Soon
Loh Poh Soon is a Specialist in the System Control Department of the Power System Operation Division of the Energy Market Authority. The Department is responsible for round the clock real-time monitoring and control of the power system in Singapore. His job responsibilities include the coordination and approval of generators and transmission equipment outage schedules, adequacy and security assessments of the power system and evaluation of the impact of proposed rules changes, especially those related to operation of the power system. Poh Soon holds a Bachelor of Engineering degree in Electrical & Electronic Engineering from Nanyang Technological University, Singapore and a Master of Science degree in Industrial & Systems Engineering from National University of Singapore.

One market clearing engine expert nominated by EMC

Cherie Chen
Cherie Chen is the Principal Market Clearing Engine (MCE) Specialist in EMC and one of the core members in the MCE support team. The MCE support team is responsible for the MCE maintenance and enhancement arising from operational needs and rule changes. She is also actively involved in enhancing the market system and improving market operation efficiency by identifying gaps between business processes and the market system, suggesting improvements to enhance the efficiency and modelling accuracy of the MCE. Cherie holds a bachelor degree in Electrical & Electronic Engineering from Nanyang Technological University, Singapore and a master degree in Materials Science & Engineering from Massachusetts Institute of Technology, USA.