DISTRIBUTION MASTRER PLAN

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DISTRIBUTION MASTRER PLAN

June 2019 revision

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Table of Contents• EXISTING NETWORK, CHALLENGES & SOLUTIONS

• METHODOLOGY FOR DISTRIBUTION PLANNING

• LIST OF COMPLETED PROJECTS 2018/19

• NETWORK REINFORCEMENT

• Nyarugenge and Rulindo Districts

• Kicukiro District

• Nyarugenge and Gasabo Districts

• Rwamagana and Gasabo Districts

• Bugesera District

• Nyagatare, Gatsibo, Kayonza Districts

• Kirehe, Ngoma and Kayonza Districts

• Gisagara, Huye, Nyanza, Nyamagabe Districts

• Musanze, Rubavu, Gakenke, Karongi, Nyabihu, Ngororero, Kamonyi, Rutsiro and Muhanga Districts

• Gicumbi, Burera, Rulindo, and Gatsibo Districts

• LIST OF URGENT PROPOSED PROJECTS & COSTING OF ALL PROJECTS

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Distribution Plan 2

EXISTING CHALLENGES

• Very long feeders;

• Lack of (N-1) solution;

• Network instability;

• Kigali City Center supplied from one

substation only.

SOLUTIONS TO THE EXISTING CHALLENGES

• Reduce feeder length;

• Reduce feeder load;

• Upgrade existing lines;

• Construct new lines to share the load;

• Plan for contingency supply;

• Plan future network.

Map of Existing Distribution Network

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Methodology

1.Planning ApproachThe major issues on the network have been addressed as follows:

• Major load centers (towns) without substations or reliable supply

• The supply to Industrial Parks

• Improvement of losses on long feeders

• Improvement of low voltage profiles on long feeders

• Contingency (N-1) supply on major load centers, towns and cities.

• Contingency supply (N-1) on long lines with many customers

• Improvement of reliability due to exposure of very long lines (due to

lightning, vandalism, rain, etc.)

• Extension of the network to supply the fast-growing network.

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2.Load forecastThe load forecast will be the important part for the distribution plan and

will consider the following key factors:

• Growth on existing networks;

• Load Growth for new Electrification;

• Load growth for bulk customers.

3.Geographical location of customers and loads

It is important to know where the load is to be able to do an accurate

simulation of the feeder load.

We have identified geographically the location of bulk loads; location of

settlements and the place of connection on the existing feeder to be able to

plan for them.

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LIST OF COMPLETED PROJECTS 2018/194

# Project name Components Outcome

1 KKK Feeder extension and load transfer to Gabiro switching station

Nyagatare Feeder (MW),

KKK Feeder (MW) and

Ngarama Feeder (MW)

Load reduction to KKK

feeder and creation of

contingency supply

2 KANAZI FEEDER – Load Transfer to Ntongwe feederInterconnection of Kanazi

and Ntongwe Feeders

Load reduction to Kanazi

Feeder

3 Nzove to Abattoir 2 x 120/20 ACSR to supply Kigali City from NzoveNyabugogo Feeder from

NZOVE Ss

Load reduction to Kigali

Feeder

4Reduce stress on Kigali Feeder (Jabana Ss) using Nzove Substation MV line

interconnections

SKOL Feeder (4.8MW)

and NYABUGOGO

Feeder (1.8MW)

Kigali Feeder now loaded

with 1.8MW

5Reduce stress on Gasogi Feeder (Gikondo Ss) using Gahanga Substation lines

interconnections

Pylon 20 Feeder (0.4MW )

and Master Steel Feeder

(0.59MW)

Gasogi feeder now loaded

with 3.63MW

6 Reinforcement of contingency supply to Kigali using Mont Kigali Substation

Nyamirambo Feeder

(4.5MW) and Rebero

Feeder (1.05MW)

Contingency supply to

Kigali City

7 Interconnection of Byumba feeder with Gabiro substation (30kV Distribution line)

Interconnection of

Ngarama and Byumba

Feeders

Contingency supply to

Byumba Feeder

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Distribution Plan Budget Summary

TOTAL CAPEX FOR PROJECTS

Fin Year USD Km Line

2018/19 - 0

2019/20 69,652,094 699

2020/21 36,332,821 1,103

2021/22 6,638,715 45

2022/23 9,791,371 51

2023/24 5,033,535 39

2024/25 4,771,045 37

2025/26 - -

TOTAL 132,219,581 1,972

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NETWORK REINFORCEMENT:

The required network reinforcement is listed District – by – District in the following pages.

Distribution Plan

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NETWORK REINFORCEMENT:Nyarugenge and Rulindo Districts

Problem statement:

Reduce stress on Kigali (Jabana) short term solution using Base FeederAfter the commissioning of NZOVE substation, the SKOL feeder (from NZOVE SS) supply Water treatment plants and continues towards Rulindo. Reduce the load on this feeder by installing an inter-connector from Base Feeder with step-down transformer and connect also the other part of Kigali Feeder.

Transfo 30/15kV / 5MVA

New line 15kV

Kigali Feeder15kV

SKOL Feeder

BASE Feeder

Distribution Plan

Solution:

Installing an inter-connector from Base Feeder with step-down transformer and connect also the other part of Kigali Feeder.

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NETWORK REINFORCEMENT:Gasabo and Rulindo Districts

Problem statement:

High loading on Rutongo feeder;Lack of Contingency supply to Rutongo, Gikomero, Deutche Welle and Kanombe Feeders:

-Provide a reliable and secure supply to Rutongo and Gasabo

Distribution Plan

Solution:

Connect Shango to existing Deutshe Welle feeder;Construct interconnection feeders from Shango substation to create (N-1) solutions to • Rutongo Feeder• Gikomero Feeder• Kanombe Feeder-Reduce load on Rutongo Feeder

Rutongo Feeder

Kanombe Feeder

Gikomero Feeder

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NETWORK REINFORCEMENTKicukiro District

Upgrade Gahanga – Gikondo Distribution LineNew Gahanga substation has capacity to support heavily loaded Gikondo - Gasogi feeder. The existing line from Gahanga to Gasogi feeder is 70mm² and must be upgraded to 120mm² to be able to support and reduce the load on the Gasogi feeder.

Distribution Plan

Upgrade this line from from 70mm² to 120mm²

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KIGALI SOUTH

KIGALI NORTH

CITY CENTER

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KIGALI CITY NETWORK REINFORCEMENTNyarugenge and Gasabo Districts

Problem Statement:• Kigali City is supplied from one substation only

(no N-1)• Kigali City is supplied from 2 feeders only and

cannot operate with only one (No N-1)• The two feeders (Kigali North and Kigali South)

are heavily loaded (7MVA each)• The internal network between K-North and K-

South is over loaded• The carbines don’t have protection or remote

switching functionality which cause long outages

Distribution Plan

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12Distribution Plan


Solutions:• Nzove Substation supplying up to Abattoir

(Nyabugogo feeder)• Upgrade Mont Kigali Substation and capacity• After Mont Kigali commissioned, Kigali north is not

overloaded• Ongoing construction new MV lines ( 2 cables)

from Gikondo to City Center (Cabine MINISTERE) with more capacity

• Ongoing construction new MV line ( 1 cable) from Gikondo to City Center (Cabine MINISTERE) with more capacity to link with other cabines via Kigali South

• Ongoing upgrade 11 cabines in Kigali with remote automatic switchgear for better operation and shorter outages

KIGALI SOUTH

KIGALI NORTH

CITY CENTERNZOVE MINISTERE

ABATTOIR

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Outcome:• Kigali was supplied from two loaded feeders (7MVA

each), now supplied from 4 feeders (4.4, 2.3, 3.5 and 4MVA respectively)

• N-1 supply on feeders is achieved• Old feeders are available as backup• Kigali City previously supplied from 1 substation

now has 3 substations to support the supply (n-1 achieved)

• Internal cables were upgraded from 95Al to 240 Cu cables to prevent overloading

• With the positioning of new infeed at Ministere, the length of the cables between K-Noth and K-south is ½ from before

• Internal supply to Gasabo side of the city (including Convention center, Amahoro stadium, etc) is improved in capacity with N-1 supply

KIGALI SOUTH

KIGALI NORTH

CITY CENTERNZOVE MINISTERE

ABATTOIR

Distribution Plan

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Distribution PlanNETWORK REINFORCEMENTRwamagana and Gasabo Districts

Problem Statement:• Musha substation transformer is over loaded (100%)• Very long feeder (Kanombe feeder) supplying up to Fumbwe with no N-1 on most

of the feeder• Industries supplied on this line with poor reliability• Rwamagana Industries have poor supply on over loaded line

Solutions• Upgrade Musha substation from 10MVA to 20MVA transformer for more capacity• Construct new distribution lines to support the Kanombe feeder and provide N-1

solution• Construct double circuit dedicated line to supply the Industrial area

Outcome• Transformer loading reduced from 100% to 50% with capacity for expansion• N-1 supply for the entire Kanombe feeder• Rwamagana feeder load reduced from 7.7 MVA to 4.2 MVA• Dedicated reliable supply for Industrial Park

Proposed N-1 supply to Kanombe feeder

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NETWORK REINFORCEMENTBugesera District

Problem Statement:

• Kanazi feeder is very long (303km)

• Highly loaded (7.8 MVA)

• No alternative supply

• Very low voltage at the end of the feeder (11%)

• Heavy industries in the south of Kanazi feeder

(Bugesera district)

• Industrial park development in Bugesera

• New airport development with no reliable supply

Kanazi fdr

Kanazi fdr

Kanazi fdr

Kanazi fdr

Ntongwe fdr

AIRPORT

Distribution Plan

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NETWORK REINFORCEMENTBugesera District

Solutions:

• A 30kV interconnection from Ntongwe feeder to Kanazifeeder has been constructed and 0.816MW have been transferred to Ntongwe feeder and N-1 option obtained

• Construct Juru (Airport) Substation with 110kV supply from Gahanga

• Construct Airport 30kV substation supplied from Juru to supply the airport

• Construct Rilima (Bugesera) 110kV substation supplied from Juru near the industrial Park

Outcome

• Kanazi feeder length reduced from 303km to 152km

• Kanazi feeder load reduced from 7.8 MVA to 3.2MVA

• Reliable supply for the airport

• Reliable supply for Bugesera District and Industrial park

Distribution Plan

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Distribution Plan

NETWORK REINFORCEMENTNyagatare, Gatsibo and Kayonza Districts

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KKK Feeder:

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0km

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Distribution PlanNETWORK REINFORCEMENT

Problem Statement:

• KKK feeder from Kabarondo Substation is very long (727km total )

• Low voltage is experienced in the north

• Factories are connected in Nyagatare in the north far from the source

(Kabarondo)

• Industrial park development planned in Nyagatare

• Very poor reliability due to long feeder length

• High load of 5.5 MVA

• Single phase lines has low voltage and small capacity and causes unbalanced

loading

• No N-1 supply on the entire feeder

• Voltage drop in the far north end is >11%

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21Distribution PlanNETWORK REINFORCEMENT

Solution:

• Construct Gabiro Substation in Gatsibo area (completed)

• Load transfered from the KKK Feeder to new Gabiro Substation (Gabiro 1, 2 and 3 feeders);

• Construct a new Substation in Nyagatare for supply to problematic single phase networks and

create capacity for the Industries on feeder 3;

• Upgrade single lines to three phase lines;

• Connection of Ngarama Feeder from new Gabiro substation to Byumba Feeder (2) for N-1 Supply.

Outcome

• KKK feeder length reduced from 727km to 216km

• KKK feeder load reduced from 5.5MVA to 1.4MVA

• Improved reliability due to shorter feeder length

• Reliable supply and improved capacity for the Factories in Nyagatare

• Reliable supply for Kayonza; Gatsibo & Nyagatare Districts

• Balanced system after single phase upgrade and voltage drops reduced

• Most voltage drop on all feeders is <4%

• N-1 supply on most of the network

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Distribution Plan

NETWORK REINFORCEMENTKirehe, Ngoma and Kayonza Districts

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NETWORK REINFORCEMENTProblem Statement:

• Existing Zaza feeder from Kabarondo is very long (64km main feeder)

• Low voltage at the end of the Zaza feeder• Limited supply to Nasho Irrigation from Rwinkwavu

15kV network• More irrigation planned in the east of Kirehe district

cannot be supplied• No alternative supply (N-1)Solution • Construct Kirehe 110kV substation supplied from 2 sides

for reliability (2025/26)• Construct a 30kV line from Kabarondo to Nasho with

30.15kV transformer to support the 15kV network (on-going 2019)

Outcome• Zaza feeder length has reduced from 64km to 25km• Zaza feeder has N-1 supply option• Low voltage problems have been corrected• Improved capacity to supply Nasho irrigation scheme• Additional capacity from Kirehe SS for new irrigation in

the east

Zaza feeder

Zaza feeder

Kirehe SS

Nasho

Zaza feeder

Distribution Plan

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Distribution Plan

NETWORK REINFORCEMENTGisagara, Huye, Nyanza and Nyamagabe Districts

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Problem Statement:

• Butare feeder is very long (520 km total feeder length)

• Poor reliability due to long feeder exposure to faults

• N-1 supply option and maintenance is difficult

• Butare town has very poor quality of supply

• Planned Huye Industrial park cannot be supplied

Butare Feeder

Rukarara Feeder


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Solution:

• Construct Gisagara substation in Gisagara District (2020)

• Construct Huye substation in Huye District (2022/23)

• Build MV feeders to configure new MV feeder network

• Interconnect all 110kV substations for N-1 supply option

Outcome

• Huye feeder length is reduced from 520km to 160km total

line length

• Supply to Gisagara and Huye districts is reinforced

• Supply is available for industrial Park

• Improved reliability due to shorter feeder lengths

• All MV feeders are within acceptable length and voltage

limits

• N-1 supply on all major distribution feeders

Rukarara

Huye

Gisagara

Butare


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Distribution Plan

NETWORK REINFORCEMENTMusanze, Rubavu, Gakenke, Karongi, Nyabihu, Ngororero, Kamonyi, Rutsiro and Muhanga Districts

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Gisenyi feeder

Gisenyi feeder

Kibuye feeder

Problem Statement:

• Gisenyi feeder from Mukungwa is very long and supply all the load up to Rubavu (442km)

• High load (7.5 MVA)• Quality of supply is bad due to long network• Maintenance is difficult due to lack of alternative supply (N-1)• Low voltage at the end of the line. • Supply in Rubavu district is dependent on Hydro power which is

not reliable (some plants are under rehabilitation)• Supply to Muhanga Industrial park is not sufficient• Gatumba feeder from Kigoma is long with no alternative supply• Supply in Ngororero area is limited as is far from all sources• Unreliable and limited evacuation route for hydros at Rwaza II,

Mukungwa II hydros.• Musanze is on the same line as the Gisenyi feeder which is

causing many outages for Musanze• Gisenyi town has many interruptions as it is supplied on the

long Gisenyi feeder from Mukungwa• Kibuye feeder from Karongi substation is long


Kiyumba feeder

Gatumba feeder

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Solutions:

• Construct Nyabihu 110/30kV substation• Construction of Musanze 110/30kV substation• Upgrade Camp Belge substation• Reconduct (upgrade) the small section lines from

Mukungwa and Ntaruka to Camp Belge substation• Construct a new line from Mukungwa to connect

Mukungwa II, Rwaza and continue to connect Janja and the Ngororero network

• Construction of Rubavu substation to supply Rubavu area and remove this from the Gisenyi feeder

• Change the open point of Kibuye feeder to reduce the length of the feeder

• Construction of Nyabarongo substation for reliable supply in Ngororero area, also interconnect with Gatumba and Kiyumba and Ngororero T-off from Gisenyi feeder.

• Construct 110kV line from Nyabarongo to Musanze and Ntaruka for N-1 supply on all substations


Nyabarongo

Kibuye fdr

Rubavu

Gisenyi fdr

Kiyumba feeder

Gatumba feeder

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Outcome:

• More reliable supply at Musanze after upgrade of Camp Belgesubstation (Musanze is not on the same feeder as Gisenyi)

• Musanze substation will provide strong and reliable supply to Musanze and industrial park and also allow for upgrade of the old feeders from Mukungwa to Camp Belge

• Gisenyi feeder length is reduced from 442 km to 116km• This improves quality of supply and reliability• The load on Gisenyi feeder is reduced from 7.5 MVA to 3.2 MVA• Rubavu has a strong and reliable supply also to supply the

industrial park.• Kibuye feeder length is reduced from 228km to 138km• The supply from Nyabarongo will reinforce the supply to

Muhanga industrial park• Muhanga substation will supply Muhanga Industrial park• Nyabarongo substation provides N-1 supply on Gatumba,

Kiyumba and Ngororero feeders


Nyabarongo

Kibuye fdr

Rubavu

Gisenyi fdr

Kiyumba feeder

Gatumba feeder

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Distribution Plan

NETWORK REINFORCEMENTGicumbi, Burera, Rulindo, and Gatsibo Districts

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Problem Statement:

• Byumba Feeder is supplied with only one substation, only the

supply from Uganda which is not secured can be the alternative

source;

• Byumba Feeder is long from the substation (462km)

• The distribution line from Rulindo is too old and constructed

with a small conductor (35mm²);


Rulindo SS

Byumba Feeder

Uganda connection

Musasa Feeder Base

Feeder

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Byumba – Ngarama Line

NETWORK REINFORCEMENTSolutions:

• Construction of Byumba – Ngarama Line for interconnecting Byumba and Ngarama

• Construction of 30kV line from Shango to ByumbaFeeder;

• Reconducting Musasa Feeder (35mm²) with 120mm²;

• Construction of 110/30kV Byumba substation (2025);

• Shift the connection points from Byumba Feeder to Byumba substation.

• Reconducting the section Byumba – Kageyo line (35mm²) with 120mm².

Outcome:• Alternative source of supply from Gabiro Substation;• Stress reduced by reducing the feeder length from 462km

to 94km;• Reliable supply for Byumba and Burera District.

Distribution Plan

Musasa Feeder

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List of Distribution Projects

# Project Name

Line Length

(km)

Budget Estimate

(USD)

Available Budget

(USD)-

MINECOFIN

Finance

Requested (USD)

Balance

required (USD)

Source of

Funds

Starting

Period

1 Upgrade of Camp Belge Substation 1,500,000 1,597,500 - AfDB 2019

2

Reconducting the existing 70mm2 conductor for 30kV Distribution lines

Mukungwa-Camp Belge with 120mm2

13 359,198 382,545 - AfDB 2019

3

Rwaza 30/30kV switching substation with 30kV distribution line to Janja

Feeder (ongoing Project) 5.2 250,000 250,000 - MINECOFIN 2019

4 Upgrade of Rubavu Network from 6.6kV to 30kV 11 4,950,000 4,950,000 - ENABEL 2019

5 30kV underground Double circuit line Bugesera to Airport 7.5 1,012,500 1,012,500 1,078,313 - AfDB 2019

6 Reconducting of the last section (35mm2 ) of Ngororero T-off with 9 248,675 264,839 - AfDB 2019

7

Split Busbars in Kigali North and Kigali South for more flexibility in

supply 80,000 85,200 AFDB 2019

8

Build a new feeder from Nyabarongo I substation and Load transfer

from Gatumba and Ngororero feeders to the new feeders from 8.5 1,174,300 1,174,300 - AfDB 2019

9 Feeder interconnetion between Kibogora & Karongi 3 414,459 414,459 2019

10 Feeder interconnection between Kilinda & Kigoma 6.2 856,548 912,224 - AfDB 2019

11 Load transfer from Kibuye Feeder to Rubavu substation 5 690,765 690,765 2019

12 upgrade of STEG network 400 6,000,000 6,000,000 - ENABEL 2019

13 construction of a 15kV double circuit line to supply industrial bulk loads 3.4 620,000 297,500 660,300 - AfDB 2019

14 UTEXRWA load transfer to DW (OHL) 1.7 200,000 213,000 - WB 2019

15 upgrade of Gahanga-Gikondo distribution line (OHL 15kV to 120/20 7.2 952,941 1,014,882 - WB 2019

16 Gikondo to Ministere feeders (underground 2x240mm2) 2.4 2,000,000 2,130,000 - WB 2019

17 30kV Airport to Nyamata (Backup OHL Line) 8.1 1,057,191 1,125,908 - AfDB 2019

18 30/30kV Switching substation in Nyamata for efficient supply 250,000 250,000 2019

19 30kV Single circuit Nyagasozi-Kavumu 36 795,054 846,732 - AfDB 2019

20

Mukungwa to Ngororero 30kV Distribution line and switching station at

Mukungwa II 34 2,550,000 2,715,750 - AfDB 2019

21 Extension of 9.3km of MV power supply to Gako beef project 9.3 1,268,777 1,351,248 - AfDB 2019

22 30kV Double circuit line from Gabiro Ss to Gabiro commercial farm 43 4,386,000 4,671,090 - AfDB 2019

23 Nasho-Kabarondo 30kV Double circuit distribution line 30 4,581,901 4,879,725 - AfDB 2019

24 Connection of 51,254 households for 100% Kigali Access (55km of 55 33,453,785 23,417,650 10,036,136 AfDB 2019

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List of Distribution Projects…

# Project Name

Line Length

(km)

Budget Estimate

(USD)

Available Budget

(USD)-

MINECOFIN

Finance

Requested (USD)

Balance

required (USD)

Source of

Funds

Starting

Period

25 Reconducting Byumba-Kageyo Line (35mm2 ) with 120mm

24 110,522 117,706 - AfDB 2020

26 Reconducting Musasa main feeder with 120mm2

20 552,612 588,532 - AfDB 2020

27 30kV distribution line to connect Rusizi feeder 0.05 7,000 7,000 2020

28 upgrade of single to three phase network-countrywide 995.5 25,908,228 25,908,228 - AfDB 2020

29

Reconduct part of Kanazi Feeder from Nyamata to Nemba 70mm2 with

120mm2 40 290,000 308,850 - AfDB 2020

30 Interconnection of Ntongwe Feeder with Rwabusoro Substation 3 414,459 414,459 2020

31 Abattoir upgrade to accommodate Nzove Supply 1,250,000 1,250,000 2020

32 Nzove to Abattoir 1 x 120/20 ACSR to supply Kigali City from Nzove 5.5 750,000 750,000 2020

33 upgrade of distribution substations in secondary cities 2,500,000 2,500,000 2020

34 upgrade and extension of different MV lines for improved supply 35 4,550,000 4,550,000 2020

35 Reduce stress on Kigali (Jabana) short term solution using Base Feeder 721,000 767,865 - AfDB 2021

36 Connect Rutongo, Gikomero and Kanombe Feeders to Shango 9.9 1,367,715 1,367,715 2021


38 30kV distribution line to connect Muhanga Industrial Park 0.5 69,076 69,076 2022

39 30kV distribution lines to connect existing lines to new feeders from 15 2,072,294 2,072,294 2022

40 Load transfer of Gisenyi Feeder to Rubavu substation 100,000 100,000 2022

41 upgrade of distribution substations in secondary cities 3,000,000 3,000,000 2022


43 Interconnection of Kiyumba feeder with the new feeder in Nyabarongo 3.5 483,535 483,535 2023


45 Load transfer of Musasa Feeder to Nyabarongo II 110/30kV 1.6 221,045 221,045 2024


TOTAL 1972.05 132,219,581 1,560,000 87,162,386 46,376,484

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34Distribution PlanCAPEX

The total required budget for the implementation

of the above project is USD 132,219,581

Project Funding USD

MINECOFIN 1,560,000.00

AfDB 72,854,504.37

WB 3,357,882.00

ENABEL 10,950,000.00

No Budget 46,376,483.61

TOTAL CAPEX FOR PROJECTS

Fin Year USD Km Line

2018/19 - 0

2019/20 69,652,094 699

2020/21 36,332,821 1,103

2021/22 6,638,715 45

2022/23 9,791,371 51

2023/24 5,033,535 39

2024/25 4,771,045 37

2025/26 - -

TOTAL 132,219,581 1,972

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Distribution Plan

Conclusion and Recommendation

We have realized that some areas need urgent interventions considering the substantial projects to be developed

and the running business contributing to the development of the Country.

Among the supply areas that need quick solutions, Bugesera and Rubavu networks as well as the reinforcement

for Kigali City network that supplies a big load Center must be given priority while thinking also to the Southern

network specially Butare feeder which suffers from instability due to the length of the Feeder.

We have estimated the projects costs in this report and therefore recommend to secure the fund and look for

alternative solutions for projects that need immediate action.

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THANK YOU

Documents

DISTRIBUTION MASTRER PLAN