Bulk Supply
Tariff
Dhofar Power System (DPS)
1. Introduction
Legal Framework & Full Definitions
Legal Basis
Pursuant to Article 74 of the Sector Law, Condition 21 of the Power and Water Procurement Licence and the terms of Nama Dhofar Services Company (NDS) Bulk Supply Agreement, Nama Power and Water Procurement Company (PWP) is required to make Bulk Supplies to NDS in consideration of a Bulk Supply Tariff.
Scope & Application
This document sets out the Bulk Supply Tariff for the Nama Dhofar Services, as determined by PWP and approved by the Authority for Public Services Regulation, Oman, for the period from 1 January 2026 to 31 December 2026.
It specifies (i) the rates to be charged for Bulk Supplies made to NDS; (ii) the method to be used to determine the quantities of Bulk Supply chargeable to NDS and (iii) the arrangements for invoicing and payment.
* This Bulk Supply Tariff is not applicable to (i) the Main Interconnected System, (i) the Musandam Power System, or (iii) any system operated as a result of the business transfer arrangement of the Rural Areas Electricity Company SAOC.
Definitions
2. Rates for Bulk Supply
Detailed Rate Bands & Charges (Table 1 & 2)
The charges for Bulk Supply made to NDS and shall be payable on a monthly basis and shall comprise (i) a bulk supply rates charged in six rate bands, based on the day of the week and the time of day that electricity is taken, and (ii) a tariff balancing charge payable in relation to the quantity of Electrical Energy Delivered, in MWh, irrespective of rate band. The rate bands are defined below.
Table 1 - Bulk Supply Rate Bands
Table 2 - Rates in Rial Omani per MWh
| Period / Month | Night-Peak Weekday |
Night-Peak Weekend |
Off-Peak Morning |
Day-Peak Weekday |
Day-Peak Weekend |
Off-Peak Afternoon |
|---|---|---|---|---|---|---|
| January - March | 12 | 12 | 12 | 12 | 12 | 12 |
| April | 30 | 23 | 18 | 18 | 24 | 20 |
| May - June | 45 | 30 | 26 | 40 | 24 | 25 |
| July - August | 16 | 15 | 14 | 14 | 14 | 14 |
| September - October | 18 | 15 | 14 | 15 | 15 | 15 |
| November - December | 12 | 12 | 12 | 12 | 12 | 12 |
3. Determination of Chargeable Supply
Methodology & Formulas (Full Text)
The rates specified in Table 2 above are applicable to Bulk Supplies made at Bulk Supply Purchase Points.
The quantity of Bulk Supply chargeable to NDS at Bulk Supply Purchase Points for each hour of each month shall be determined by PWP as follows:
- BSh = the Bulk Supply in MWh chargeable to NDS for hour h;
- LAFm = the Loss Adjustment Factor for month m, determined as set out below;
- BSMh = the quantity of electricity in MWh metered (or deemed metered) in hour h at the Bulk Supply Points related to NDS; and
- Th = the net Transfers in MWh received (or deemed received) in hour h by NDS, being the sum of all Transfers received (or deemed received) minus the sum of all Transfers given (or deemed given).
Data Reporting & Estimation
PWP shall calculate BSM on the basis of information reported to it in accordance with the Grid Code or a Distribution Code (as applicable). PWP shall calculate Th on the basis of information reported to it in accordance with the Grid Code or a Distribution Code (as applicable) or as otherwise provided to it by NDS.
In either case, where the relevant hourly data is not reported or otherwise provided, PWP shall estimate BSMh or Th using (i) daily data and representative hourly profiles provided by the Licensed Transmission System Operator or (ii) such other reasonable method as it sees fit.
Loss Adjustment Factor (LAF)
PWP shall determine the Loss Adjustment Factor on a monthly basis as follows:
Where:
- LAFm = the Loss Adjustment Factor for month m;
- TBPm = the total quantity of electricity (in MWh) purchased by PWP at Bulk Supply Purchase Points in month m;
- TBSMm = the sum of BSMh (as described above) for NDS over all hours in month m; and
- SCSm = the total quantity of electricity in MWh sold by PWP into or over Connected Systems in month m.
4. Invoicing and Payment
Billing Cycle & Terms
PWP shall invoice NDS for Bulk Supplies in accordance with the following procedure:
End of Month (Estimated)
Immediately following the end of each month, PWP shall estimate the quantities of Bulk Supply chargeable to NDS for that month using such reasonable method as it sees fit and shall issue a preliminary invoice on the basis of such estimated quantities.
Post-Month (Actual)
As soon as reasonably practicable following the end of each month, PWP shall calculate, as provided in section 3 above, the quantities of Bulk Supply chargeable to NDS for that month and shall issue a statement of the Bulk Supply charges payable in respect thereof. This shall be accompanied by a supplemental invoice or credit, as applicable, reflecting the adjustments required to the preliminary invoices.
End of Year (Final)
As soon as reasonably practicable following the end of the calendar year, and after consultation with NDS, PWP shall make a final calculation of the quantities of Bulk Supply chargeable to NDS for each month during the year, and shall issue a final consolidated statement of the Bulk Supply charges payable in respect thereof. This shall be accompanied by a final supplemental invoice or credit, as applicable, reflecting any further adjustments required to the previous invoices.
Payment & Credits Terms
Payment of invoices issued as described above shall be made by NDS within thirty (30) days of receipt.
Where a credit is issued to NDS as described above, NDS may either (i) deduct such amount from subsequent payment(s) of Bulk Supply charges to PWP or (ii) request, in writing, that the relevant amount be refunded in cash by PWP, in which case PWP shall make such payment within thirty (30) days of receipt of the request.
5. Amendments
Under certain circumstances it may become necessary to amend this Bulk Supply Tariff during its period of application. Any such amendment shall only be made in accordance with the PWP License and with the approval of the Authority for Public Services Regulation, Oman.
PWP shall provide NDS with details (including the date of application) of any amendment on a timely basis.