renewable energy considerations for the bahamas
TRANSCRIPT
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RENEWABLE ENERGY CONSIDERATIONS FOR THE BAHAMAS
Charvari Watson RahmingApplied MeteorologyNovember 10th 2015
Solar Panels – Andros HotelCredits: Bahamas Out Island Promotion Board
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OBJECTIVES Assess the need for an alternative energy resource Analyze the breakdown of electrical utility market
and population in the Bahamas Discuss the viability of solar energy as an energy
resource of choice in the Bahamas Analyze the implementation of photo voltaic cells
and solar parks to the electrical utility market in the family islands, New Providence and Grand Bahama
Propose goals and potential action plan for implementation of solar power in the Bahamas
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THE BAHAMAS AND ENERGY RESOURCES
Satellite image of the Bahamas: Courtesy of Rolling HarborResidential Power Line installation: Courtesy of the Seeley family
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THE BAHAMAS ENERGY MARKET Imported oil products accounts for 99%
of total energy utilized for energy consumption 44% from heavy fuel 56% from automotive diesel oil
Two electrical utility companies Bahamas Electricity Corporation – 80% Grand Bahama Power company – 20%
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BAHAMAS ENERGY DISTRIBUTION AND DEMAND
Distributed among 17 island grids Operates 30 diesel generating plants in
26 Island locations Capacity = 20MW or less
Energy demand in the Bahamas 7500 kWh per household per year on
average 664,588 MWh per year
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MARKET SUMMARIES FOR ELECTRICAL PROVIDERS
Utility Companies
Bahamas Electricity Corporation (BEC)
Grand Bahama Electricity (GBE)
Totals
Plants 29 1 30Capacity (MW)
438 141 579
Peak Demand (MW)
359** 74 433
Percentage of Peak Demand / Capacity(%)
81.96 52.48 74.78** Projected Peak Demand By 2013; Represents all Islands Except Grand Bahama
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NEED FOR ALTERNATE RENEWABLE RESOURCES Electrical energy produced comes almost
exclusively from fossil fuels Contributor to Green House gas emissions and Global
Warming Contributor to other air pollutant emissions
Electrical grids stressed due to heavy demands from growing market of consumers
High utility prices and fuel surcharge Increased usage of generators by private homes
and companies Monthly outages 4 times higher than other
Caribbean companies
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RENEWABLE ENERGY SOLUTION
Photovoltaic Solar Park, Modi India: Courtesy of Reuters
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ENERGY FROM THE SUN 170,000 terawatt hours of energy daily
about 2,850 times the energy required by people around the world.
Amount of energy released from sun in 40 minutes = energy that is consumed by the entire population of the planet in one year.
Amount of energy released from sun in 20 days = All the energy stored in Earth's reserves of coal, oil, and natural gas
Currently harness about 1% of this energy
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REVIEW OF PHOTOVOLTAIC TECHNOLOGY
Called solar cells Energy from photons from sun Direct transformation of solar radiation
energy into electrical energy Silicon (semi-conductor) or thin film
technology Energy transferred to electrons in solid Produces electric voltage through
movement of electrons
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WORKING PRINCIPLE OF A PHOTOVOLTAIC CELL
Courtesy of: The Finest Solar Company, Berkshire England
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Hypothesis - The Bahamas is able to viably utilize solar radiation for the generation of electrical power. The premise is supported by two variables: Global Horizontal Irradiance (GHI) - is the total
amount of shortwave radiation received from above by a surface horizontal to the ground.
Technical potential - represents the achievable energy generation of a particular technology given system performance, topographic limitations, environmental, and land-use constraints
SOLAR ENERGY – A RENEWABLE ENERGY SOLUTION
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Global Horizontal Irradiance= 5.3kWh/m2/day (less than region’s - 5.5 and higher) Based on latitude, seasonal and diurnal
cycle of the sun Technical potential = 58 MW/ 58000 kW
Average maximum output of a system, considering limitations
GHI AND TECHNICAL POTENTIAL OF SOLAR POWER
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ENVIRONMENTAL IMPACT OF PHOTO VOLTAIC TECHNOLOGY
Manufacture Use of hazardous materials
Strong acids, trichloro-ethene and acetone used in cleaning semi conductor surface
Gallium arsenide, cadmium telluride in thin film PV cells Life-cycle greenhouse emissions from production
0.08 – 0.2 pounds of CO2 equivalent per KWh Operation
Land degradation Loss of habitat Water used for cooling
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COST OF IMPLEMENTATION Solar power plants
$4950 – 11311 per kW 20 MW = $99 million Based on delivery system, solar multiple, storage
and capacity factors Building integrated solar panels
$8500 – 11000 for 4 kwp system
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POTENTIAL SAVINGS A 20 MW power station will therefore
consume about 5,000 litres an hour of fuel. 1321.8 gallons
Diesel fuel costs = $3.81 per gallon Total operating cost for 20 MW power station
1321.8 x24 x365 x 3.81 $44,115,868 / $44 million
Solar power station will pay itself off in 2.25 years.
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POTENTIAL SAVINGS Cost of electricity per kWh
0 – 200 units = 10.95 cents per kilowatt hour
Bill = $400 a month $4800 a month
Price of PV system = $11,000 System will pay itself off in 2.29 years
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CASE STUDY - TOKELAU
Tokelau natives response to BHP Billiton claim of coal being the answer to poverty: courtesy of 350.org
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CASE STUDY - TOKELAU Island in the South Pacific Population – 1500 Received 7 million funding from New
Zealand for installations 100% powered by solar energy Resorts to coconut oil during cloudy
days Generates 150% of total demand for
island
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TOKELAU – PAVING THE WAY FORWARD Serves as a model for island nations for the
use of hybrid micro-grids By switching to renewable energy:
reduced their reliance on imported fuels, kept money in the local economy, provided their residents with reliable power,
and lower their carbon emissions. serves as “test beds” for adoption of new
technologies and models of what can happen on a larger scale.
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IMPLEMENTATION OF PHOTOVOLTAIC POWER GENERATION
There are three was in which PV power can be implemented (BEST Commission) Building Integrated Photovoltaic Cells
Confined to rooftops/ building facade Green Field Power Plants
Up to 8-9 hectares Solar Parks
Up to 100 hectares Will explore the implementation of each in Out
Islands, New Providence and Grand Bahama
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POWERING THE OUT ISLANDS
Dock at Governor’s Harbour Eleuthera: Courtesy of Matt Long
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THE OUT ISLANDS Accounts for approx. 15% of the Bahamian
population (Census 2010) Accounts for approx. 30% of BEC’s load Population ranges for each island is as high as
17,000 to as low as 100 persons As a result, demand on electrical grid is
relatively low Possibility of utilizing solar parks and green
fields to power the out islands 100% Reduces peak load percentage of BEC to 58%
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UTILIZING SOLAR PARKS/ GREEN FIELDSAdvantages DisadvantagesClean Energy Land Mass
AvailabilityLow Maintenance ExpenseReduction of Diesel Plants/ Usage/ GH Gas Emissions
Inconsistent
Lower fuel Surcharge
Large Scale Environmental Impact
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SITE SELECTIONS FOR GREEN FIELDS/ SOLAR PARKS
Small population Small load on electrical grid Available land Solar irradiance
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INTRODUCTION OF SOLAR PARKS AND GREEN FIELDS TO THE OUT ISLANDS
Peak Load for New Providence = 254 Projected for Bahamas (BEC) = 359 Load for Out Island = 105 MW
Total Peak Load – Peak Load (NP) = Peak Load (OI)
359 – 254 = 105 MW 29.24% of BEC’s peak load
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POPULATION USAGE FACTORS
248,948, 70%
51,756, 15%
52,954, 15%
Bahamas Population 2010 Census
New Prov-idenceGrand BahamaOut Islands
25459%74
17%
10524%
Peak Load Per Is-land (MW)
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DEMAND IN LESS POPULATED OUT ISLANDS
Correlation of population to peak load = 0.988
Used calculated correlation to determine the peak load in the following islands
Can determine the ability of an island to fully convert to solar energy in the form of solar parks once peak demand does not exceed 58 MW Ensures efficiency of the system
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BAHAMAS POPULATION AND PEAK LOAD CALCULATIONIsland Population (2010
census)Peak Load (MW)
Rum Cay 99 45.6Mayaguana 271 45.8Crooked Island 323 45.9Acklins 560 46.1Berry Islands 798 46.3San Salvador 930 46.4Spanish Wells 1537 46.9Harbour Island 1702 47.0Bimini 2008 47.3Andros 7386 51.8Eleuthera 7826 52.1Abaco 16692 59.8
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APPLICATION OF SOLAR FIELDS 100 kwp blocks used Performance prediction (BEST) for FS-
275 module Thin film module Fixed Mounting Performance ratio = 86.7% Energy Produced = 185 MWh year
Approx 176% of capacity of the Out Islands
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TABLE SHOWING POTENTIAL ANNUAL YIELD FOR 9 ISLANDS
Island
Available Land for open field power plant (ha)
Technical Capacity (MW)
Structural capacity (MW)
Annual Yield (MWh/a)
Abaco 9357 4678 30.48 52730Acklins-Crooked Island 3 2 1.04 1799Andros 1570 785 7.32 12664Eleuthera 1306 653 13.96 24151Exuma Cays 109 54 10.67 18459Grand Bahama 185 92 92.35 159758Inagua 14 7 - -Mayaguana 2 1 0.31 536New Providence 1206 603 315.20 545296
Technical Capacity: land = 1MW: 2 hectares
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LIMITATIONS AND SOLUTIONS Land availability
1 hectare required for 1 MW of power i.e. 20 MW = 20 hectares = 50 acres
Can pose a problem for islands with larger populations and limited available land space
Resolution: Can link solar parks to existing grid to compensate for shortages
Resolution: Integrate biaxial tracking system instead of single axis tracking on smaller islands
Resolution: Introduce building integrated systems to reduce the use of land space
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LIMITATIONS AND SOLUTIONS CONTD. Area related risk
Equipment may be at risk for damages, especially during the hurricane season
Resolution: to minimize damages, reinforcements such as steel beam foundation and reinforcement may be used
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POWERING THE URBANIZED AREAS
Freeport Harbour, Freeport Grand Bahama: Courtesy of the_bahamas.net
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DEMAND IN NEW PROVIDENCE AND GRAND BAHAMA
Accounts for 85% of the population of the Bahamas (Population Census 2010)
Heavy demand, due to growing population, tourist population arrivals and industrial activity
Insufficient space and available power to construct small scale green fields
Frequent blackouts as a result of capacity overload
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UTILIZING PHOTOVOLTAIC CELLS Rooftops of facades of buildings can be
outfitted with photovoltaic cells Can be connected to existing grid (grid tied) Already implemented by hotels, businesses
and home owners Negligible operational environmental impact Vendors exist – standard 4kwp system
price ranges between $8500 and $11,000
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UTILIZING PHOTOVOLTAIC CELLS CONTD. Success and electricity generation heavily
dependent on sunshine climatic data Examples: The United Kingdom
Scotland 3.61 hours of average daily sunshine 4kwp system can generate 3200 kwh a year
Northern Ireland 3.45 hours of average daily sunshine 4kwp system can generate 3,400 kwh a year.
South England 4.42 hours of average daily sunshine 4kwp system can generate 3800 kwh a year
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CALCULATING POWER GENERATED USING SUNSHINE CLIMATE DATA
Climate data of Grand Bahama and New Providence obtained
Correlation calculated using UK values for average daily sunshine and power generated from 4kwp systems
Calculation of power generated by 4kwp system in both New Providence and Grand Bahama
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CLIMATE DATA – AVERAGE SUNSHINE DATA 1981-2010
Month
Average Daily Sunshine Freeport (hours)
Average Daily Sunshine New Providence (hours)
Jan 7 7.3Feb 7.6 8Mar 8.1 8.4Apr 9.1 9.4May 9.1 9Jun 7.8 7.9Jul 8.3 8.5Aug 8.1 8.4Sep 7 7.4Oct 7.6 7.6Nov 7.2 7.3Dec 6.7 6.8
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CLIMATE DATA – GRAPHICAL REPRESENTATION
Jan Mar May Jul Sep
Nov0123456789
10
Climat Data For Sunshine 1981-2010
Average Daily Sunshine Freeport (hoursAverage Daily Sunshine New Providence (hours)H
ours
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CALCULATIONS Correlation = 0.88 Average sunlight hours: energy generated
New Providence; 7.975: 5619.32 kwh per annum Grand Bahama; 7.700: 5476.6 kwh per annum
Average energy consumption per capita = 7500 kwh per annum
664,588 MWh per year (entire Bahamas) Building integrated PV modules
Up to 10 Kwh – Residential Homes (up to 2 –4 kWp systems) Up to 1 Mwh – Large commercial/public building (up to 200 4-
kwp systems)
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LIMITATIONS AND SOLUTIONS Monetary expenses for initial purchase and installation
Resolution: governmental subsidies ie. reduction of tariffs for import, feed in tariffs at government level, duty free items, compensation for excess power to feed the grid (offsets demand)
Receive finding from international bodies Insufficient power from cells in larger homes and
businesses and due to limited sunshine in less sunny months. (below average) Resolution: Compensate by educating public on
conservation techniques, invest in larger system, access power into grid
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GOALS AND ACTION PLANS
China’s largest concentrated solar power plant: Courtesy of EVWind
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GOALS Reduce the consumption of fossil fuels to
65% by the year 2030 Construct solar parks with capacity of 20MW
or less, removing them from the electrical grid.
Increase accessibility and affordability of photo voltaic cells to the general public
Increase incentives and awareness of the benefits of solar power to the general public
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ACTION PLAN Replace Out Island power plants with photo voltaic
plants Out Fit government buildings with photo voltaic cells Education of the public in utilizing energy efficient
appliances Grant incentives for homeowners to purchase and
outfit homes with solar panels Lower the import duty on photo voltaic cells Introduce subsidies geared towards the solar power
industry
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REFERENCES Department of Statistics; “PERCENTAGE DISTRIBUTION OF POPULATION BY ISLAND 2000 AND 2010 CENSUSES”. The
Bahamas Government; May 2011. http://statistics.bahamas.gov.bs/download/082103200.pdf(Accessed 10/25/15)
Energy Savings Plus; Solar Panels,” Last updated, September 2014 http://www.energysavingtrust.org.uk/domestic/solar-panels(Accessed 10/27/2015)
Guevara-Stone, L. An Island (Tokelau) Powered 100% By Solar Energy, The Rocky Mountain institute. October 6th, 2013 http://cleantechnica.com/2013/10/06/an-island-tokelau-powered-100-by-solar-energy/(Accessed 10/30/2015)
Hartnell, Neil; “Bahamas Fails To Enact 27% Energy Demand Cut Plan“ The Tribune, Nassau Bahamas; December 11th , 201http://www.tribune242.com/news/2013/dec/11/bahamas-fails-enact-27-energy-demand-cut-plan/(Accessed 10/25/15)
Maura, S.; Climatic Data for annual average Sunshine by Month. 1981-2010, Bahamas Department of Meteorology; Date retrieved October 24th, 2015
Ministry of the Environment and Housing; Ministry of Works and Urban Development: “The Bahamas National Energy Policy 2013-2033” http://www.thebahamasweekly.com/uploads/16/energypolicy.pdf(Accessed 10/21/15)
Organization of American States; National Renewable Energy Laboratory, “Energy Policy and Analysis in the Caribbean 2010-2011”. May 2012 http://www.ecpamericas.org/data/files/Initiatives/lccc_caribbean/LCCC_Report_Final_May2012.pdf(Accessed 10/25/15)
Public Interest Energy Research Program (PIER) “Potential Health and Environmental Impacts Associated With the Manufacture and Use of Photovoltaic Cells” November 2003, http://www.energy.ca.gov/reports/500-04-053.PDF(Accessed 10/25/15)
Solar Tribune; “4000 Watt Solar kits,”.http://solartribune.com/solar-kits/4000-watt/(Accessed 10/31/15)
The BEST Commission; Promoting Sustainable Energy in the Bahamas; The Bahamas Government; September 2010, http://www.best.bs/webdocs/1016_finalreport.pdf(Accessed 10/25/15)
The union of concerned scientists;. “Environmental Impacts of Solar Power” Last Revised: March 5th, 2013 www.ucsusa.org/clean_energy/our-energy-choices/renewable-energy/environmental-impacts-solar-power.htmlThink Global Green Organization; Solar Power, http://www.thinkglobalgreen.org/solar.htmlAccessed 10/31/15)