Bulk Supply
Tariff
Main Interconnected System (MIS)
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 each Licensed Supplier’s Bulk Supply Agreement, Nama Power and Water Procurement Company (PWP) is required to make Bulk Supplies to Licensed Suppliers in consideration of a Bulk Supply Tariff.
Scope & Application
This document sets out the Bulk Supply Tariff, as determined by PWP and approved by the Authority for Public Services Regulation, for the period from 1 January 2026 to 31 December 2026.
It specifies (i) the rates to be charged for Bulk Supplies made to Licensed Suppliers; (ii) the method to be used to determine the quantities of Bulk Supply chargeable to each Licensed Supplier and (iii) the arrangements for invoicing and payment.
* This Bulk Supply Tariff is not applicable to (i) the Dhofar Power System or (ii) any system operated as a result of the business transfer arrangement of the Rural Areas Electricity Company SAOC. or (iii) Musandam Power System.
Definitions
2. Rates for Bulk Supply
Detailed Rate Bands & Charges (Table 1 & 2)
The charges for Bulk Supply made to Licensed Suppliers and shall be payable on a monthly basis and shall comprise (i) a bulk supply rates charged in four 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 - Bulk Supply Rates in Rial Omani per MWh
| PERIOD / MONTH | OFF-PEAK | NIGHT-PEAK | WEEKDAY DAY | WEEKEND DAY |
|---|---|---|---|---|
| January - March | 12 | 12 | 12 | 12 |
| April | 13 | 13 | 13 | 13 |
| May - July | 19 | 45 | 35 | 32 |
| August - September | 15 | 27 | 18 | 17 |
| October | 13 | 13 | 13 | 13 |
| November - December | 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 each Licensed Supplier 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 the relevant Licensed Supplier 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 the relevant Licensed Supplier; and
- Th = the net Transfers in MWh received (or deemed received) in hour h by the relevant Licensed Supplier, 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 the relevant Licensed Suppliers.
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 BSM (as described above) for all Licensed Suppliers 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 Licensed Suppliers 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 each Licensed Supplier 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 each Licensed Supplier 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 Licensed Suppliers, PWP shall make a final calculation of the quantities of Bulk Supply chargeable to each Licensed Supplier 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 Licensed Suppliers within thirty (30) days of receipt.
Where a credit is issued to a Licensed Supplier as described above, the Licensed Supplier 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.
PWP shall provide Licensed Suppliers with details (including the date of application) of any amendment on a timely basis.