Presentation by Trevor Branton on Energy Choices Received on Thursday 22 nd November 2007 At the Co-op training centre Ipswich.
ENERGY OPTIONS • • Fossil Fuels Nuclear Wind Waves Tides Sun Biomass Heat inside the earth
ELECRICITY USAGE
Fossil Fuels • • • Availability/Demand – World Depleting resources — Dash for Gas Fuel or Raw Material? Security of supply — Georgia Political — Iraq, Middle East Cost - Fluctuation and dependence Global Warming Acid Rain Transport Fuel Ash Disposal
Nuclear Energy • Siting Demand Grid Connections Foundations Cooling Water • Sizewell A Magnox • Capacity 420 MW (Supply 500 000 homes) • Lifetime Availability ~75% • Typical Annual Production 3 000 units • 1 tonne Uranium 15000 tonnes coal (Magnox) • 1 tonne Uranium 150 000 tonnes coal (PWR) • Unit of Comparison Sizewell A Output • Sizewell B is equivalent to 3 Sizewell A Output • 30 times Fibropower at Eye = Sizewell A Output
Coal Equivalent and Emissions • • Sizewell A Lifetime Electricity Production 110 000 000 units Fossil Plant Efficiency 35% Total Heat Equivalent 314 285 714 MWh 1 131 000 GJ Calorific Value of Coal 23. 5 GJ/tonne Coal Equivalent 48. 1 million tonnes Ash Produced 13. 5 million tonnes C 02 Production 127. 1 million tonnes
WIND ENERGY • • • British Wind Energy Association Installed Capacity 1200 MW Average Availability 300 MW Cost 500 MW Capacity £ 800 Million 500 MW Output £ 3200 Million Environment 1200 MW East Anglia Wildlife Bird strike Visual On shore Wales Lewis Noise Radio Interference Reliability Availability 25% When the ~jg~ wind blows About 75% of Sizewell A output.
Wave Power • • • Another form of wind power (BWEA) Potential 120 000 MW Difficult Technology Engineering problems are clearly formidable (Pilot plants keep getting washed away, damaged or corroded up) Getting the power ashore over long distances No practical energy extraction demonstrated Economics are speculative Variations Winter Storms/Summer Calms Scottish Isles - Small unit
Tides • • • La Rance Small pilot scheme 12. 4 hour cycle and 14 day cycle Power approx. Tidal Range - Twice Time of high tide changes daily Severn Estuary 2. 5 to 14 times Sizewell A Very high capital costs — cf Thames Barrier Long construction times Environmental Impact Weston-super-Mare 2 miles of mud Wildlife Waders displaced Shipping Restrictions
The Sun • Each year the Earth receives from the Sun 12000 times the energy consumed in 1970. • Solar Domestic Water Heating (5% of energy use) • Is it becoming more viable? • (Financial benefit cf interest from capital) • Solar Electricity Generation • Timing — energy need when Sun is not out • Britain one third of Sahara radiation • Very variable, particularly in Winter • Large collecting areas needed • High Capital Cost Service Life • £ 150 000 installation — how much for £ 7500?
Biomass • • • Sunlight harnessed by biological conversion Trees for fuel Sugar and crops into alcohol Algae into methane Efficiency of sunlight into energy ~ 1% Coniferous trees would need to cover 50% of land area to meet country’s energy needs. (Plus 20% to meet husbandry energy needs) • Sizewell A 3 to 4 million tonnes of wood • Fuel v Food - Mexico - Economics
Biomass — Vegetable Oil • Vegetable oil use in UK 100 000 tonnes/year • Could produce 40 MW from generation = 1 000 units per day • A fry-up typically consumes 1 unit = 1 000 fry ups/day • Therefore the recycling of waste vegetable oil could produce sufficient energy to be self sustaining.
Geothermal • In theory — everything going for it BUT • Depth at which useful temperature occurs is dependent on how long ago there was volcanic activity. • Iceland New Zealand Relatively recent — high geothermal gradient • UK 55 million years — low geothermal gradients 25 °C per kilometre • Test Site on Cheshire/Shropshire 16°C • Los Alamos Geothermal Test Site 100°C per kilometre • Would require at least an 8 kilometre deep hole costs and difficulty increase rapidly with increasing depth.
UK ELECTRICITY FUEL MIX • • • Gas 39% 19500 MW Coal 33% 16500 MW Nuclear 21% 10500 MW Other (Oil) 3% 1500 MW Renewable 4% 2000 MW Hydro Resource nearly fully utilised Biomass Fibropower Wind Nuclear (2006) 12000 MW Nuclear (Current) 11000 MW Nuclear (After 2010) ‘~ 9600 MW
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