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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 2015 to 31 December 2017. 

The RCP consists of 14 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 Assistant Chief Executive (System Operation) of the Power System Operator. He is responsible for the overall assessment of medium to long-term power and natural gas system security, stability and reliability. He carries out power and natural gas system studies and assesses the impact of new generating plants on the power and natural gas system, as well as the transmission expansion plans of electricity and natural gas transmission licensees. Currently, he also assists the Deputy Chief Executive in overseeing the System Control Department, Gas System Supervision Department and Energy Management System Department. He holds a Bachelor Degree (Hons) in Electrical & Electronic Engineering from Nanyang Technological University.

Representatives of the Generation Licensee class of market participant

Grace Chiam l-Ling
Grace Chiam is Production Unit Manager of Shell Eastern Petroleum (Pte) Ltd, where she is responsible for integrated management of energy and utilities. She manages power generation assets at Shell’s Pulau Bukom site where she also has operational accountability of its energy portfolio that includes natural gas, electricity and steam. She looks for opportunities to optimise fuel sources from self-generation and external purchase by achieving a good balance. Grace holds a BEng (Hons) in Chemical Engineering and a PhD in Chemical Engineering from University of Birmingham, UK.

Marcus Tan Yam Ngee
Marcus Tan is General Manager (Portfolio Management) of PacificLight Power Pte Ltd, where he is a pioneer in the commercial group of Singapore’s first greenfield power generation plant owned by a consortium of international investors. He is responsible for the power and gas market operation and leads the development of the company’s trading strategies which include oil and foreign currency under his portfolio. Prior to joining PacificLight, he had worked in a local leading power generation company for more than 12 years, starting as an electrical engineer and joined the commercial group in 2001 when the department was expanding to operate in the National Electricity Market of Singapore (NEMS) which was launched in 2003. His final position was Assistant Vice President (Fuel Hedging & Procurement), responsible for fuel hedging operation and physical liquid fuel management. He holds a Bachelor (Hons) Degree in Electrical & Electronic Engineering from the University of Manchester Institute of Science and Technology and a Master Degree in Applied Finance from the Macquarie University. 

Priscilla Chua
Priscilla Chua is currently Deputy Manager for Trading and Fuel Management in Tuas Power Generation Pte Ltd.  She has 12 years of experience in the electricity power industry, and has been involved in NEMS since its inception as well as the former Singapore Electricity Pool.  Besides her responsibilities for executing bidding strategies in the real-time electricity trading pool,  she is also a key member of Tuas Power Generation’s team tasked with the company operation as a Shipper in the Singapore Gas Market. She graduated from RMIT University (Royal Melbourne Institute of Technology) with Bachelor in Economic and Finance (With Distinction) in 2005.

Representative of the Transmission Licensee class of market participant

Carol Tan
Carol Tan is Vice President (Regulatory Management) of Singapore Power (SP) Ltd. She is responsible for managing the regulatory affairs in relation to SP’s regulated transmission and distribution business in Singapore. Prior to joining SP, Carol held roles ranging from investments and mergers and acquisitions, private equity, project finance to greenfield development of infrastructure and renewable energy assets throughout Asia. She attended the Executive Development Program from Chicago Booth School of Business and is a Chartered Financial Analyst. She also holds a Masters of Engineering (Electrical) degree from the National University of Singapore.

Representatives of the Retail Electricity Licensee class of market participant

Daniel Lee Kong Leng
Daniel Lee Kong Leng is the Senior Manager (Regulation) of YTL PowerSeraya Pte Ltd (YTLPS).  He is responsible for all market regulation issues affecting YTLPS including the regulatory contracts such as the vesting contracts and ancillary services contracts. Before joining YTLPS, he worked for the regulator of Singapore’s electricity and gas sectors, the Energy Market Authority of Singapore (EMA), where his last held position was Deputy Director, Wholesale Market Branch. He was for more than six years responsible for analyzing and recommending proposed changes to the Singapore Electricity Market Rules for EMA’s approval. In addition to holding a Bachelor of Social Sciences (Hons) Degree in Economics from the National University of Singapore, he has passed all the examinations required to hold the charter for the Chartered Financial Analyst designation and holds the Financial Risk Manager designation.  He attended an Executive Programme at Harvard University in 2004. He is currently the Category A Shipper Representative of the Code Modification Panel which is responsible for reviewing proposed amendments to Singapore’s Gas Network Code.

Luke Peacocke
Mr Luke Peacocke is Senior Vice President – Trading and Portfolio Management for Senoko Energy Pte Ltd, a leading utility company in Singapore. This role covers the management of Senoko's electricity, gas, oil and FX positions to optimise commerical performance. Prior to joining Senoko, Mr, Peacocke established the commerical functions of a power corporation in the Philippines, and held various roles with the Energy Market Company. He holds a Bachelor of Arts and a Bachelor of Commerce and Administration (First Class Honors) from Victoria University of Wellington, New Zealand, and an MBA from the University of Chicago Booth School of Business.

Sean Chan Sik Lung
Sean is the General Manager (Regulation & Risk Management), Keppel Infrastructure Holdings Pte Ltd.  He has more than 17 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), he holds a B.Eng (Hons) in Mechanical (Marine) Engineering from John Moors University (UK) and a MBA from University of Sheffield (UK).

Representative of the wholesaler electricity market trader class of market participant

Dallon Kay
Mr Dallon Kay is the President & CEO of Diamond Energy Corporation the first Wholesale Trader and Demand Response Aggregator in the National Electricity Market of Singapore.  The company, founded by Mr Kay, has been trading Interruptible Load, a form of Demand Response, since 2006.  He is also the founder of the Singapore Industrial Energy Consumers group which was formed in 2007 with the objective of advancing embedded generation policy for combined heat and power energy efficiency investments in Singapore.  His previous roles in the region include Director Commercial Development Asia for Duke Energy and Director Power Markets and Regulatory Strategy Asia for Chevron.  He has been a member of the Rules Change Panel for the National Electricity Market of Singapore since 2006 and is currently serving on the council of the Sustainable Energy Association of Singapore.  Mr Kay resides in Singapore where he has been a Permanent Resident since 2002.

Representative of the Market Support Services Licensees

Lawrence Lee Siew Ming
Lawrence Lee is the Head (Operations & Projects) of SP Services Ltd, where he is responsible for billing services, metering data management and installation services. He has over 16 years of experience in the utilities industry. He graduated from the National University of Singapore with a Bachelor of Science in Biochemistry (Second Upper Honours) in 1996.

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 Assistant 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 Associate Professor, Department of Business Policy, School of Business, National University of Singapore as well as a Research Assistant in the Ministry of Environment. 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.

Person experienced in financial matters in Singapore

Phillip Tan Eng Seong
Mr Tan is a Fellow of the Institute of Certified Public Accountants of Singapore and a Fellow of the Institute of Chartered Accountants in England and Wales and has more than 30 years of audit and financial advisory experience. Until his retirement in 2007, he was a member of the Leadership Team and Governance Committee of PricewaterhouseCoopers Singapore. Currently, Mr Tan is the Group Finance Director of Citystate Capital Asia Pte Ltd whose wholly-owned subsidiaries include a Singapore General Insurance Company and a number of Insurance Broking Companies.  Mr Tan is active in community service and is serving on the Boards of a number of statutory and charitable bodies. He is also a recipient of the Public Service Medal, Public Service Star.