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TRANSCRIPT
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Open University
Energy and Environment Research Unit
Sustainable energy
systems: Linking the
local to the global
Prof. David Elliott
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Agenda
• Energy - Climate and other eco-impacts
• Decarbonisation options
1. What scale- local or global?
2. Potentials and Progress
3. How to integrate / link up
4. Supergrids- across continents
5. Global solutions- technical & social policy issues
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World
Fossil
Fuel
Use
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Possible Oil and gas peaks Laherrere, J.H
OPEC Seminar
2001
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Carbon dioxide emissions
Temperature
Royal Commission on Environmental Pollution (2000) ‘Energy –
The Changing Climate’, 22nd Report, Cmnd 4749
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Summary of IPCC TAR projections
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Does it matter?
If all the
ice caps
melted
and
seas
expand
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Climate changeThe Stern report in 2008 estimated
that the control/mitigation costs
were equivalent to around 1-2% of
UK Gross National Product,
whereas the long term damage
costs might be up to 20% of GNP
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Why the rush?Because it takes a long time for greenhouse
gases to disperse/be absorbed
Residence time in upper atmosphere- for emissions in ~1990
Source: IPCC TAR
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Conventional coal fired power plant- carbon dioxide gas
released up chimney stack
Waste heat pumped out as steam from cooling towers
Electricity Supply- a major source of CO2
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Also a large source-
Gas fired central heating
C02 produced directly in your house!
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Road traffic currently
produces about 20% of UK
greenhouse gas emissions
On present trends, by 2030
emissions from aviation
could rise from 6% as at
present to 20% of UK
greenhouse gas emissions
Vehicle fuels
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Mitigation of climate change
Decarbonisation -Technological Solutions
1. Sequestration - capture and store CO2
2. Use lower carbon fuels- switch to gas
3. Generate energy more efficiently -CHP
4. Use fuels more efficiently- more from less
5. Use non-fossil fuels - nuclear and/or renewables
Social solutions - use less/change lifestyle
Adaptation to climate change- social and technical adjustments to cope with it
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Trees absorb carbon dioxide as they grow, but
release it again when they rot or burn
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Geotechnical fixes• Spray water droplets into
atmosphere- makes cloud
cover whiter so reflecting
more sunlight. Salter has
proposed fleets of remote
controlled spray vessels
using Flettner rotors and
the Magnus effect.
•Seed the seas with ferric compounds to increase
algal growth to absorb more carbon dioxide
•Put micro-particles in space orbit or aerosol
particles in the atmosphere to reflect sunlight
Unknown
eco- impacts
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Carbon dioxide storage: Norwegian Statoil’s Sleipner field project. Gas from this field has a very high CO2 content.
Excess CO2 is pumped into a saline aquifer, the Utsira formation, about 800 m below the sea bed.
A million tonnes per year of CO2 are ‘sequestered’ in this way
Carbon Capture and Storage
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Loft Insulation
High efficiency Windows Compact Fluorescent Lamps
Domestic
Energy
Efficiency
Cavity wall filling
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There is 120GW of wind capacity
installed so far globally- mostly on
land
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Next-
Offshore
wind,
tidal,
wave
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MCT Seaflow tidal current turbine
SeaFlow Marine
Current Turbine
farm
Building offshore
renewables at Burntisland
Fabrications in Scotland
Lunar Energy Tidal farm
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We can also use solar energy for heating - 120GW(Thermal) globally so far
and for electricity generation - 10GW (e) so far globally
..and
biomass
energy crops
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The UK is very well placed- we have enviable
renewable energy sources
Potential % of overall UK electricity supply in 2050
Onshore wind 8-11%
Offshore wind 18-23%
Wave/Tidal 12-14%
Biomass 9-11%
PV solar 6-8%
TOTAL 53-67%
Based on overall likely level of supply of 400-500 TWh in 2050
Source: DTI/Carbon Trust ‘Renewables Innovation Review’ 2004
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Past and Expected reductions from 1980 prices
Source: ‘U.S. Program in Renewable Energy- Effectiveness and
Progress’, Stanley R. Bull, NREL, paper to WREC X 2008
1980 1985 1990 1995 2000 2005 2010 2015 2020 2025
100%
50%
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Costs of electricity by 2020
pence/kWh
On Land wind 1.5 - 2.5
Offshore wind 2 - 3
Energy crops 2.5- 4
Wave and tidal power 3 - 6
PV Solar 10 - 16
Gas CCGT 2 - 2.3
Large CHP/cogeneration under 2p
Micro CHP 2.3 - 3.5
Coal (IGCC) 3 – 3.5
Nuclear 3 - 4
Source: PIU Energy Review
UK Cabinet Office PIU study 2003
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Long term cost trends
Source: SUNA Iran,
paper to WREC X 2008