This tender addendum and clarification forms part of the Request for Proposal and Contract documents, and modifies them as follows:

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2 This tender addendum and clarification forms part of the Request for Proposal and Contract documents, and modifies them as follows: I. ADDENDUM Isinya Mandatory Spares list Description Quantity A AIS 400kV Circuit breaker 1 Single phase breaker pole 1 2 Operating mechanism 1 3 Density switch 1 4 Trip coils 1 5 Closing coils 1 6 Set of O rings for gas circuit 1 7 Gaskets 1 set 1 B AIS 220kV Circuit breaker 1 1 Single phase breaker pole 1 2 Operating mechanism 1 3 Density switch 1 4 Trip coils 1 5 Closing coils 1 6 Set of O rings for gas circuit 1 7 Gaskets 1 set 1 C Power transformers 1 Buchholz relay 1 2 Silica gel breather 1 3 Primary side phase bushing complete with gaskets 1 4 Secondary side phase bushing complete with gasket 1 5 Primary and secondary neutral bushing complete with gasket 1 6 Replacement for each part likely to be damaged upon operation of the pressure relief relay operation of each transformer 1 7 Motor for each on load tap changer 1 8 Set of contact for each load tap changer 1 9 Dial type thermometer 1 10 Thermostat 1 11 Winding temperature indicator 1 12 Oil temperature indicator 1 D Disconnectors and Earthing switches 1 400kV Complete unit with earthing switch kV Complete unit with earthing switch kV operating mechanism kV operating mechanism 1 2

3 5 Three pole set of moving contact 400kV disconnector 1 6 Three pole set of fixed contact 400kV disconnector 1 7 Three pole set of moving contact 220kV disconnector 1 8 Three pole set of fixed contact 220kV disconnector 1 E Instrument transformers and Surge arrestors 1 Spare 400kV current transformer 1 2 Spare 220kV current transformer 1 3 Spare 400kV capacitor voltage transformer 1 4 Spare 220kV capacitor voltage transformer 1 5 Spare 400kV metering unit 1 6 Spare 220kV metering unit 1 7 Spare 400kV surge arrestor 1 8 Spare 220kV surge arrestor 1 9 Secondary fuses for 400kV and 220kV current transformers 6 10 MCBs for 400kV and 220kV voltage transformer 6 F Transmission cables 1 220kV cable 3 x 100m 2 Cable termination 2 3 Complete cable repair joint 2 G Post insulators 1 400kV post insulators kV post insulators 2 H SF6 gas accessories 1 Vacuum pump set for evacuation 1 2 SF6 gas cylinder 11kg 3 3 Trolley 1 4 Gas leak detector (portable type) 2 5 Gas filling equipment 1 I Protection relays 1 Distance protection relay 1 2 Line differential protection relay 1 3 Transformer differential protection relay 1 4 Transformer overcurrent protection relay 1 5 Trip circuit supervision relay 1 6 Busbar protection relay 1 J Control equipment 1 Indication lamps of each type 3 2 Ammeters 1 3 Voltmeters 1 4 Megawatt meter 1 5 Megavar meter 1 3

4 6 Current transducer 1 7 Voltage transducer 1 8 Watt transducer 1 9 Var transducer 1 10 Key operated discrepancy control switch for circuit breaker 2 11 Discrepancy switch for disconnector and circuit breaker 2 12 Annunciator/ alarm units 1 13 Digital display of transformer tap changer position indication 1 14 Push buttons 2 15 Two position selector switch 1 16 Energy meters 1 17 Bay control units 1 18 Ethernet switches 1 19 Operator workstation 1 K Auxiliary voltage accessories (LVAC) 2 Fuse and links of each type and ratings used 2 3 Auxiliary relays of each type used 1 4 MCCBs of each type used 2 7 Main incomer circuit breaker 1 L 110V distribution board 2 Indication lamps 1 3 Fuses and links pairs 3 4 Auxiliary relays of each type used 1 7 MCCBs of each type used 3 M 48V distribution board 2 Indication lamps 1 3 Fuse and links of each type and ratings used 3 4 Auxiliary relays of each type used 1 7 MCCBs of each type used 3 N Fibre optics equipment and Telephone exchange 1 Each type of STM cards used 2 2 Each type of Teleprotection equipment cards used 2 3 Telephone cable 20m 4 Fibre optic splicing kits and consumables 1 4

5 5 Telephone sets 2 6 SAS/ SCADA module for each of the different cards offered 1 7 Fiber optic approach cable drum 6km O Miscellaneous 1 DC lamps for control room emergency switching 6 2 Substation/ switchyard lighting which shall include: a. Lamps of each type and power used 6 b. Lamp fittings for each type of lamps used 6 3 Maintenance tools with: a. Electrical maintenance tool box 3 b. Mechanical maintenance tool box 3 4 Warehouse 1 Isinya Substation Warehouse At Isinya Substation a store with a usable space area of 1600 square metres will be built. The store shall be appropriately partitioned by the Contractor to the approval of the Employer. This partitioning shall take into consideration that a forklift shall be used for moving the material/equipment. The store should be well ventilated and with sufficient air circulation. 5