Consumers have been classified as being either contestable or non-contestable depending on their level of electricity usage. Contestable consumers may choose to purchase electricity from a retailer or directly from the wholesale market or indirectly from the wholesale market through SP Services. Non-contestable consumers are supplied by SP Services.

The EMA is the regulator of the electricity industry and has the ultimate responsibility for the market framework and ensuring that the interests of consumers are protected.

EMC operates and administers the wholesale market. This role includes calculating prices, scheduling generation, clearing and settling market transactions and procuring ancillary services. EMC also administers the rule change process and assists the Market Surveillance and Compliance Panel and Dispute Resolution Counsellor.

The PSO (a division of the EMA) is responsible for ensuring the reliable supply of electricity to consumers and the secure operation of the power system. The PSO controls the dispatch of generation facilities, co-ordinates outages and power system emergency planning and directs the operation of the high-voltage transmission system.

Generation Licensees
Generation Licensees generate electricity for injection into the power grid. They offer to generate various quantities of electricity at their associated prices. All offers are then pooled in the wholesale market to match the demand for electricity.
Active generators are: Sembcorp Cogen Pte Ltd, National Environment Agency, Keppel Merlimau Cogen Pte Ltd, Senoko Waste-To-Energy Pte Ltd (in its capacity as Trustee of Senoko Trust),Tuas Power Generation Pte Ltd, Senoko Energy Pte Ltd, Shell Singapore Pte Ltd, Keppel Seghers Tuas Waste-To-Energy Plant Pte Ltd(in its capacity as Trustee of Tuas DBOO Trust), ExxonMobil Asia Pacific Pte Ltd, PacificLight Power Pte Ltd, YTL PowerSeraya Pte Ltd, TP Utilities Pte Ltd, Singapore Refining Company Pte Ltd, TuasOne Pte Ltd, Sembcorp Floating Solar Singapore Pte Ltd, Sembcorp Solar Singapore Pte Ltd and Taser Power Pte Ltd.

Interruptible Loads
Interruptible loads are contestable consumers of electricity that participate in the wholesale market and allow their supply of electricity to be interrupted in the event of a system disturbance in exchange for reserve payments.

Market Support Services Licensee
An MSSL is authorised to provide market support services. Such services include consumer registration and transfer, meter reading and meter data management, retail settlements and billing for contestable consumers. SP Services Ltd is the only MSSL.

Retail Electricity Licensees
Retailers that sell electricity to contestable consumers are licensed by the EMA. Retailers that are registered as market participants purchase electricity directly from the wholesale market.
Active retailers are: Keppel Electric Pte Ltd, Sembcorp Power Pte Ltd, Senoko Energy Supply Pte Ltd, Seraya Energy Pte Ltd, Tuas Power Supply Pte Ltd, Diamond Electric Pte Ltd, PacificLight Energy Pte Ltd, Sunseap Energy Pte Ltd, Union Power Pte Ltd, Just Electric Pte Ltd, Cleantech Solar Singapore Assets Pte Ltd, Bioenergy Pte Ltd, Flo Energy Singapore Pte Ltd and ENGIE South East Asia Pte Ltd.

Transmission Licensee
SP PowerAssets Ltd owns and is responsible for maintaining the transmission system.

Wholesale Market Traders
Companies, other than generators or retailers, that are licensed by the EMA to trade in the wholesale electricity market are wholesale market traders.
The current wholesale market traders are: Green Power Asia Pte Ltd, Singapore LNG Corporation Pte Ltd, JE Green Solutions Pte Ltd, Sunseap Leasing Pte Ltd, LYS Genco Beta Pte Ltd, Singapore District Cooling Pte Ltd, Air Liquide Singapore Private Limited, Public Utilities Board, Terrenus Energy SL2 Pte Ltd, Solarland Alpha Assets Pte Ltd, PSA Corporation Limited, Crystal Clear Environmental Pte Ltd, Terrenus Energy SL1X Pte Ltd, BEWGI-UE NEWater Pte Ltd, HSBC Institutional Trust Services (Singapore) Limited (in its capacity as trustee of AIMS APAC REIT), Sunseap Commercial Assets Pte Ltd, and Terrenus Energy SR3 Pte Ltd. 

Applications Under Consideration
MA Energy (SG) Pte Ltd.

Withdrawal By Market Participants
EMC has received a notice under Chapter 2, Section 4.1.1 of the Singapore Electricity Market Rules from the following market participants, stating their intention to cease participation in the wholesale electricity markets.

The registration of the following market participants will expire on the dates stated in the last column of the table below: