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Rules Change Panel


All proposed modifications to the Market Rules are reviewed by the Rules Change Panel (RCP). Thereafter, the RCP makes a recommendation to the EMC Board and the decision of the EMC Board is submitted to Energy Market Authority for endorsement.

Members of the RCP represent a wide range of experience from the electricity industry and the financial industry.

The current 3-year RCP term is effective from 1 January 2021 to 31 December 2023. 

The RCP consists of 15 members:


Toh Seong Wah
Toh Seong Wah is the Chief Executive Officer of EMC. He joined EMC in August 2011 as the head of the Market Operations and Information Technology (MOIT) teams, which provide the resources and support to ensure that the trading, pricing and settlement in the NEMS are in accordance with the Market Rules. Seong Wah brings with him extensive experience from the public sector. Prior to joining EMC, he was involved in several large scale whole-of-government infrastructure and technology initiatives, including the Standard ICT Operating Environment (SOE) which was the largest government infocomm programme at the time with a project value of S$1.3 billion. Seong Wah graduated from Nanyang Technological University with an honours degree in Electrical Engineering.

Employee of EMC

Henry Gan
Henry Gan is currently EMC’s Senior Vice President, Market Operations. He oversees the market operations of the NEMS and ensures that market operations are consistent with the strategic direction of the organisation. He leads a team of customer driven staff to plan and implement solutions that support an efficient and reliable market. This includes pricing and information operations, settlement and clearing operations as well as the management of ancillary services contracts. Henry has significant industry and technical experience and has been with EMC since the start of the market. Prior to joining EMC in early 2001, he was Market Operations Manager for the Singapore Electricity Pool with PowerGrid which he joined in 1996. Henry graduated in 1996 from Nanyang Technological University with an Honours degree in Electrical Engineering.

Representative of the PSO

Soh Yap Choon
Soh Yap Choon is the Deputy Chief Executive (System Operation) of the Power System Operation Division (PSOD) of EMA. He heads the Power System Operator which arranges for the secure operation of the power system in Singapore and ensures the security of supply of electricity to consumers. PSOD's Power System Control Centre (PSCC) is the nerve centre of the electricity generation and transmission system. The Division operates mission critical Energy Management Systems, and carries out power system studies and assessments of the impact of new generating plants as well as transmission expansion plans of electricity and gas transmission licensees. Yap Choon holds a Bachelor Degree (Hons) in Electrical & Electronic Engineering from Nanyang Technological University.

Representatives of the Generation Licensee class of market participant

Teo Chin Hau
Teo Chin Hau is General Manager, Portfolio Management at PacificLight Power Pte Ltd. He currently oversees operation of both the electricity and gas markets and management of strategic fuel, in addition to fuel and foreign exchange hedging. He has over 10 years of experience in the Singapore energy industry, having previously been involved in wholesale trading, retail pricing, gas and electricity regulatory tariff setting, regulatory management and portfolio hedging. Chin Hau holds a  B.Eng (Hons) in Mechanical Engineering from the National University of Singapore.

Tony Tan Kia Shuan
Tony Tan is Vice President (Trading & Regulation) of Tuas Power Generation Pte Ltd. He is responsible for formulating trading strategies and regulatory matters. He reports to the Chief Operating Officer and is a member of the Senior Management Team. He joined the company in 2004 and was previously heading the Risk Management Department until 2016. He was also a member of the Technical Working Group (TWG) for 8 years. Tony holds a Bachelor of Social Sciences in Economics with 2nd Class Honours (Upper Division) from the National University of Singapore and risk management certifications in Associate Risk Management (ARM), Certified Risk Management Professional (CRMP) and Financial Risk Manager (FRM).

Calvin Quek
Calvin Quek is the Vice President, Prompt Trading of Senoko Energy Pte Ltd with 9 years of experience in the industry. He is responsible for managing the trading team's market optimization strategies, the day to day trading operations as well as evaluation of consultation papers and market rules changes. He holds a Bachelor degree in Electrical & Electronic Engineering from Nanyang Technological University, Singapore.

Representative of the Transmission Licensee class of market participant

Sherman Toh
Sherman Toh is an Assistant Director (Regulatory Management) of Singapore Power (SP) Ltd. He has more than 20 years of experience in the power industry and is responsible for commercial and policy affairs in SP’s regulated Transmission & Distribution business in Singapore. He holds a B.Eng (Hons) in Electronic & Electrical Engineering from University of Glasgow.

Representatives of the Retail Electricity Licensee class of market participant

Sean Chan Sik Lung
Sean Chan is the Head (Regulation & Risk Management) at Keppel Infrastructure Holdings Pte Ltd.  He has more than 20 years of experience in utilities industry, with involvement in liberalization and development of Singapore electricity and gas markets, and managing the associated regulatory, market and operational risks faced by utilities. He was also actively involved in the regulatory reset for the Victorian electricity transmission company in Australia in 2002. Prior to joining the utilities industry in Singapore, Sean was a Director managing a marine consultancy firm in Hong Kong.  A Chartered Engineer (UK), Sean holds a B.Eng (Hons) in Mechanical (Marine) Engineering from John Moors University (UK) and a MBA from University of Sheffield (UK).

Song Jian En  
Song Jian En is the Head of Portfolio Strategy at YTL PowerSeraya Pte Ltd.  He has more than 10 years of experience in utilities industry starting off as an operation engineer, moving into wholesale trading & regulatory and managing the electricity retail portfolio. He was heavily involved in EMA Open Electricity Market (OEM) scheme in 2018 as a licensed retailer, working closely with the regulator to develop and refine market policies. Prior to joining YTL PowerSeraya Pte Ltd, Jian’En was Manager Consultant in a leading consulting firm providing management consultancy to utilities players in Southeast Asia. Jian En holds a Bachelor of Electrical Engineering from National University of Singapore (NUS).

Matthijs Jan Guichelaar
Matthijs Jan Guichelaar is the CEO of Flo Energy Singapore Pte Ltd. He has over 10 years of experience in the energy sector. He has experienced various electricity market transformations in his previous capacity as the CEO of Dutch licensed energy retailer Vandebron B.V. Matthijs previously served as the treasurer of the Free Trade Organisation of Electricity and Gas (VOEG), a trade association for energy retailers in the Netherlands. He holds a Bachelor of Civil Engineering from the University of Applied Sciences, Amsterdam.

Representative of the wholesaler electricity market trader class of market participant

Cheong Zhen Siong
Cheong Zhen Siong is currently the Director of Energy Management Office for Air Liquide Singapore Pte Ltd. He has worked in the utilities and energy sector for 13 years and is well-versed in both operational, technical and commercial perspectives of the utility business. He holds a Master In Business Administration and bachelor degree in Chemical Engineering, both from National University of Singapore.

Representative of the Market Support Services Licensees

Rachel Su Huifen
Rachel is currently the Director in the Regulatory Management department at Singapore Power (SP) Ltd. She is responsible for managing the regulatory affairs in relation to SP’s electricity, district cooling and new energies businesses. Prior to joining SP, Rachel held roles in the Energy Market Authority, covering a diverse range of policy and regulatory issues. She holds a Master of Science in Applied Finance from the Singapore Management University and a Bachelor of Business in Applied Economics with 2nd Class Honours (Upper Division) from the Nanyang Technological University.

Representatives of consumers of electricity in Singapore

Dr Toh Mun Heng
Dr Toh Mun Heng has been a member of the Central Committee of the Consumers Association of Singapore since 1995. He served in the CaseTrust Advisory Council and Fair Trading Legislation Committee, which eventually led to the passing of the Consumer Protection (Fair Trading) Act in 2004. Currently, Dr Toh serves as the Chairperson of CASE Endowment Fund Board of Trustee and Treasurer of CASE. He is consulted by numerous governmental and international organisations which include Agency for Science and Technology Research, ASEAN Secretariat, Civil Aviation Authority of Singapore, InfoComm Development Authority, Singapore, Ministry of Finance, Ministry of Health, Ministry of Manpower, Ministry of Trade and Industry, UN ESCAP and the United Nations and many others. He obtained his doctoral degree in Economics and Econometrics from the University of London, London School of Economics. He is currently an Honorary Fellow of the National University of Singapore and former Associate Professor of the Department of Strategy and Policy, NUS Business School. He researches and writes prolifically in many topics including Household Economics, Manpower/Education Planning and Population Studies and Productivity Measurement and Analysis in Asia Pacific Economies.

Fong Yeng Keong
YK Fong is the Purchasing Manager at Petrochemical Corporation of Singapore (Pte) Ltd (PCS). He has 26 years of experience in PCS and is currently responsible for procurement of all plant, equipment, spares, major utilities and services from external sources to facilitate smooth and efficient operation and maintenance work. His major duties include contracts’ price, negotiation of terms and conditions, contractor evaluations and overseeing the operation of PCS’s warehouses. He holds an MSc Mechanical Engineering from National University of Singapore.

Person experienced in financial matters in Singapore

Tan Chian Khong
Tan Chian Khong is a Fellow of the Institute of Singapore Chartered Accountants. He is an independent director of Alliance Bank Malaysia Berhad, Straits Trading Company Limited, CSE Global Limited and Xinghua Port Holdings Ltd. Mr Tan is also a board member of the Casino Regulatory Authority and SMRT Corporation Litd. He volunteers as the honorary executive director of Trailblazer Foundation Ltd, and on the board of the Methodist Welfare Services. He was a partner at Ernst & Young LLP, and has approximately 35 years of experience in the audit industry.