This document provides details on a proposed community managed micro hydropower plant project in Mbulu district, Manyara region of Tanzania. The 25 kW plant would utilize a 40m head from the Hhaynu River to power a cross flow turbine connected to a 40 kVA synchronous generator. It would provide electricity to 3 schools, a health center, and 90 households. The total estimated cost is TZS 273.85 million with funding from REA, Arusha Technical College, and community contributions. The plant is expected to generate annual revenue of TZS 9.8 million from electricity sales.

1. Community Managed Hhaynu
Micro Hydropower Plant
Mbulu district - Manyara

2. Major features of the proposed
Micro-hydropower Plant
 Scheme Location:
Name of the scheme : Hhaynu Micro-hydropower Plant
Source of discharge : Hhaynu River
Location : Nambis and Murray wards
District : Mbulu
Region : Manyara
Beneficiaries : Three (3) Schools
One (1) Health Center/dispensary
Ninety (90) Households
Load Center : Nambis and Murray villages
Route to reach the Site : Arusha – Mbulu – Nambis/Murray
Slide 2

3. Cont……
 Technical Features:
Net Head : 40 m
Measured Flow : 90 l/s June, 2014
Design Flow : 80 l/s
Electrical Power : 25 kW
Penstock Pipe : 185 m, long, 300mm diameter
Type of Penstock Pipe : Mild Steel, 3.5 mm thick
Intake : Side Intake
Slide 3

4. Cont…..
 Electrical - Mechanical Features:
Type of Turbine : Cross Flow Turbine
Turbine shaft Power : 31.25 kW (Mechanical)
Mechanical Transmission : Pulley and Belt
Generator : 40 kVA, 50Hz, 400/240V, 1500rpm,
0.8 pf (Synchronous Generator)
ELC : 20 kW
Ballast Load : Industrial Immersion Heater 20 kW
Total length of Distribution line : 3795 m
Slide 4

5. Cont…..
 Financial Features:
Investment Cost of Scheme : TZS. 273,850,000/=
IRR : 20%
NPV : TZS. 109,363,300/=
B/C Ratio : 1.35
Slide 5

6. Summary of Scheme Design Data
Scheme
Est.
design
Flow
rate (l/s)
Est.
Head
(m)
Est.
Hydraulic
Power
(kW)
Est.
Electrical
Power
(kW)
System
Efficiency
(%)
Penstock
dia. (mm)
Turbine
Technology
Hhaynu 80 40 31.25 25 80 300 Cross flow
Slide 6

7. Summary of Sources of Finance
S/N Source Amount
(TZS)
Share
(%)
Remarks
1 REA Grant/Rural
Lighting Competition 232,150,500 84.8 LRTC2014
2 Arusha Technical
College
22,367,132 8.2 Funds anticipated
3 Local Community 9,530,000 3.5 Funds confirmed
4 Revenue Collection
(bills)
9,802,368 3.5 After project
completion
TOTAL 273,850,000 100
Slide 7

8. PROJECTED INCOME STATEMENT
(Year one)
Slide 8
YEAR ONE YEAR TWO
Revenue
Sale of Goods and Services 9,802,368.00$ -$
Arusha Technicl College (Anticipated) 22,367,132.00$ -$
Local Community (Commited) 9,530,000.00$ -$
Totals 41,699,500.00$ -$
Expenses
Personnel 33,000,000$ -$
Material and Equipment 208,700,000$ -$
Training 10,500,000$ -$
Travel 5,500,000$ -$
Other 5,050,000$ -$
Evaluation/Dissemination 6,500,000$ -$
General/Overhead 4,600,000$ -$
Totals 273,850,000$ -$
Net Gain (Loss) without LRTC2010 Grant (232,150,500)$ -$
LRTC2014 Grant Requested: 232,150,500$

9. List of end use demand and revenue
(25 kW Scheme Capacity)
S/N
Beneficiary
Qty
Capacity(kW)
Oper
ating
hour
s per
day
Operati
ng days
per
month
Operati
ng
months
per
year
Total
Energy
Consump
tion (kWh)
with pf.
0.8
TariffTZSper
kWh
TotalAnnual
Income(TZS)
1 School 3 2.0 8 25 12 11,520 200 2,304,000
2 Health
Centre 1 4.0 10 30 12 11,520 200 2,304,000
3 Household 90 0.167 8 30 12 34,629.12 150 5,194,368
25.03 kW TOTAL 9,802,368
Slide 9

10. PROJECT OVERVIEW
 Overall objective:
 Improving community services through establishing a
community micro hydropower plant that will provide
reliable and affordable electricity for lighting in schools,
health center and household
 Project Purpose:
 Public facilities and households at Nambis/Murray
Community to have reliable and affordable electricity for
lighting, comfort and any potential livelihood before the
end of 2015
Slide 10

11. Site Location
Slide 11

12. Major System Components
Slide 12

13. Diversion Weir and Intake:
 The diversion weir :
 A barrier built across the river
used to divert water through an
opening in the riverside (the
‘Intake’ opening) into a settling
basin.
 Settling Basin
 The settling basin is used to
trap sand or suspended silt
from the water before
entering the penstock. It may
be built at the intake or at the
forebay.
Slide 13

14. Cont….
 Headrace
 A channel leading water to a
forebay or turbine. The
headrace follows the contour of
the hillside so as to preserve the
elevation of the diverted water.
 Headtank
 Pond at the top of a penstock or
pipeline; serves as final settling
basin, provides submergence of
penstock inlet and
accommodation of trash rack
and overflow/spillway
arrangement. Slide 14

15. Cont….
 Penstock
 A close conduit or pressure pipe for
supplying water under pressure to a
turbine.
 Water Turbine and Generator
 A water turbine is a machine to directly
convert the kinetic energy of the
flowing water into a useful rotational
energy while a generator is a device
used to convert mechanical energy
into electrical energy
Slide 15

16. THANK YOU
Slide 16