The Technical Challenges and Opportunities for Developers ...
Transcript of The Technical Challenges and Opportunities for Developers ...
Renewable Energy and Mini Grids in East Africa
The Technical Challenges and Opportunities for
Developers, Investors and Off-Takers
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Mini-Grids
— Mini Grid = Micro Grid
— Electricity distribution systems containing loads and distributed energy
resources, (such as distributed generators, storage devices, or controllable loads)
that can be operated in a controlled, coordinated way either while connected
to the main power network or while islanded. (CIGRE)
— Typically includes a mix of
dispatchable and non-dispatchable
power sources.
— Health & Safety of new electricity
users of utmost importance.
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Global Market Trends
— Value of the market - $12 billion in 2016 and is estimated to reach $23
billion in 2021 (GlobalData)
— Mini Grids with renewables generation sources are becoming a go-to
option for project developers.
— US Mini Grid market:
— 39% of the global market share during 2016
— Forecasting 52% by 2021
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Why Mini-Grids and Renewables in Sub-Saharan Africa?
— Rural energy access remains a
major challenge
— 1.5 billion people without access to
electricity
— 80% in rural areas
— Large proportion across the African
continent
— Centralised electricity generation
— Inequity in access is prevalent
even where supply has been
achieved
IEA, 2012
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The Benefits of Mini-Grids
— Power connectivity to remote populations at lower cost
— Fast deployment
— Tailor design of Mini-Grid to local requirements
— Enhanced reliability of supply and resilience
— Integration of local / renewable generation sources
— Better environmental performance
— Trading / market access
—Grid-tied: market participation, aggregation of
resources, Mini Grid as a virtual power plant
— Islanded: community energy / markets
— Power quality
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Energy Storage and Mini-Grids
— Energy storage acts as a balancing mechanism
— Whole range of benefits including:
— Energy management and reserves
— Avoids / defers reinforcement
— Improves power quality and reliability
— Improves system control
— Range of energy storage technologies:
— Batteries
— Pumped storage
— Hydrogen energy storage
— Thermal (molten salt)
— Compressed Air Energy Storage (CAES)
— High power flywheels
— High power supercapacitors
Photo courtesy of Anesco
Spector, 2016
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Commercial Challenges
— Upfront capital investment. Main cost components:
— Generating plant
— Energy storage
— Switchgear protection and transformers
— Communication and control system
— Site engineering and construction cost
— Cost of Mini-Grid technology is reducing
— Cost of renewable generation and energy
storage technologies is reducing
— Increasing reliability leading to reduced
OPEX
— New payment innovations – pay-as-you-go
and mobile money
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Regulatory Challenges
—Rural electrification agendas now feature extensively across Sub-
Saharan Africa
—Streamline regulations - unclear which regulations apply
—Electricity distribution concessions
—Cost reflective tariffs
—Plan for future growth
ACORE, 2015
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Load Study
— Objective – 20 year power projected daily and annual hourly load
profile data
— Input for the preliminary design of a solar PV, battery, and diesel Mini
Grid for the island
— Annual power and energy forecast, daily load profile
— Number of customers per customer class
— Sales per customer class
— Analysis of the impact of Distributed Generation additions and Energy
Efficiency programmes
— Challenges for forecasting load using standard
regression analysis
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Individual Approach to Load Forecast
Detailed site survey
Establishing work programme and development of tools
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Present and Future Conditions
- Identifying main driver for load increase:
1. Development on the island
2. Population growth
3. Main load types
4. New electrical appliances in the houses (upgrade)
5. Occupancy rates
Present:
Future:
Scenario 1 Scenario 2 Scenario 3
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New Infrastructure Development
— STREET LIGHTS - Island length
1.7 km, One pole at 8m, LED
15W each.
— DESALINATION PLANT- 100
litres / day / person, the required
plant should be run by 15 kW to
20 kW motor
— WATER PRESSURE PUMP-
Based on the length of the island
the required size of the pump is
between 5kW and 10kW
— MARKET/SHOP constant load
level when the shop is open (9h-
21h) and when closed
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Load Forecast Results
Annual growth 11.7% to 14.7%
2.4% 1.3%
Very high annual growthi within first 1 to 5 years
Yearly forecast for 20 years – for understanding the size for electrical installations/system
Detailed daily diagrams – for dimensioning the Mini Grid (the size of solar, wind, storage, diesel)
Typical working day: Typical weekend: Yearly Peak:
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National Department of Tourism, South Africa
— National Department of Tourism of South Africa – renewable energy Mini Grid projects at state-
owned tourism attractions:
— Robben Island, Western Cape Province
(667 kWp)
— Hantam National Botanical Garden,
Western Cape Province (HNBG) (2.5
kWp)
— Karoo Desert National Botanical Garden,
Northern Cape Province (KNBG) (52.9
kWp)
— Free State National Botanical Garden,
Free State Province (FNBG) (52.9 kWp)