Use of System Charge

The Use-of-System charges, which is payable to SP Group, is to recover the cost of transporting electricity through the national power grid. Note that the charges differ according to the voltage at which a consumer receives the electricity supply.

Effective 1 April 2024 to 31 March 2025

1. Ultra High Tension - for consumers taking supplies at 230kV, 50Hz, 3-phase, 3-wire for connection with minimum Contracted Capacity of 85,000kW*.
2. Extra High Tension - for consumers taking supplies at 66kV, 50Hz, 3-phase, 3-wire for a Contracted Capacity:
   1. a. between 25,501kW and 84,999kW for service connection from the nearest feasible 66kV substation*
   2. b. between 85,000kW and 170,000kW for service connection from the nearest feasible 66kV source station*
   The above shall apply to new and existing customers.
3. High Tension - Large - for consumers taking supplies at 22kV or 6.6kV, 50Hz, 3-phase, 3-wire for a Contracted Capacity:
   1. a. between 1,700kW and 12,750kW for 1 or 2 HT 22kV services*
   2. b. between 12,751kW and 25,500kW for 3 or 4 HT 22kV services*
4. High Tension - Small - for consumers taking supplies at 22kV or 6.6kV, 50Hz, 3-phase, 3-wire for connection with Contracted Capacity of less than 1,700kW.
5. Low Tension - Large - for contestable consumers taking supplies at 400V/230V.
6. Low Tension - Small - for all non-contestable consumers taking supplies at 400V/230V. These are consumers who choose to buy electricity from SP Group at the regulated tariff.
7. The Uncontracted Capacity Charge (UCC) applies in the event that the maximum demand in kW (measured by the half-hour integration meter) exceeds the Contracted Capacity. UCC applies to:
   1. a. Normal customers without embedded generation;
   2. b. Customers with embedded generation who require top-up supplies and opt to summate their kW output from embedded generation and kW demand from the network (i.e Summation Scheme) for determining maximum demand; and
   3. c. Customers with embedded generation who require top-up supplies and opt to cap their power demand in kW drawn from the network (i.e Capped Capacity Scheme or Extended Capped Capacity Scheme). The UCC applies in the event that the maximum demand in kW (measured by the half-hour integration meter) exceeds the contracted capacity and shall be limited to 20% of the Contracted Capacity.
8. For Capped Capacity Scheme (CCS), the Uncontracted Standby Capacity Charge (USCC), at 5 times of Contracted Capacity Charge, applies in the event that the demand in kW (measured by the power meter) drawn from the network exceeds 120% of the contracted capacity for a duration of more than 10 seconds continuously.
9. For Extended Capped Capacity Scheme (ECCS), the 2-tier Uncontracted Standby Capacity Charge (USCC) applies as follows:
   1. Tier 1: 5 times of Contracted Capacity Charge is applicable if the demand in kW drawn from the network exceeds 120% and up to 200% of the contracted capacity for a duration of more than 100 seconds continuously.
   2. Tier 2: 12 times of Contracted Capacity Charge is applicable if the demand in kW drawn from the network exceeds 200% of the contracted capacity for a duration of more than 10 seconds continuously.
10. For both CCS and ECCS, the consumer shall at its own expense, install and maintain Load Limiting Device, in accordance with requirements that the Transmission Licensee may stipulate from time to time.