indirect solar energy...cape wind project unit 14 –indirect solar - slide 9 april 2015 - contracts...
TRANSCRIPT
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Indirect Solar Energy
• Hydroelectric
• Wind
• Biomass
Unit 14 – Indirect Solar - Slide 1
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Hydroelectric
Unit 14 – Indirect Solar - Slide 2
Power depends on flow rate
(m3/sec) and “head” (m)
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High volume? Big head?
Unit 14 – Indirect Solar - Slide 3
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How much from hydro?
Unit 14 – Indirect Solar - Slide 4
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Issues with hydroelectric
• Is “dispatchable”
Unit 14 – Indirect Solar - Slide 5
• Limited number of places possible.
• Can displace large number of people
• Changes flow – silt buildup?
• Drought can decrease power just when
you need it.
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Wind
Unit 12 – Energy from the earth - Slide 6
• Power depends on wind velocity and
size of turbine
• Average land based power ~ 2 MW
• Goes like vmax3
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Wind Potential
Unit 14 – Indirect Solar - Slide 7
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Issues with Wind
Unit 12 – Energy from the earth - Slide 8
• Can be built in small pieces in short
time scales
• Little effect on the land
• Not dispatchable
• Wind doesn’t blow all the time
• Wind is not where the people are
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Cape Wind Project
Unit 14 – Indirect Solar - Slide 9
April 2015 - contracts with the
state’s two largest utilities were
terminated in January after Cape
Wind missed its December 31
financing deadline.
May 2014 – Federal judge dismisses
law suit against NSTAR power
purchase agreement
130 Siemens 3.6-megawatt
offshore wind turbines with
a capacity of 468
megawatts.
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Off-Shore Wind (Others)
Unit 14 – Indirect Solar - Slide 10
England 7.9 GW(7MW turbines)
Denmark 1.3 GW(8.2 MW turbines)
China 4.6 GW
Germany 6.4 GW
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Unit 12 – Energy from the earth - Slide 11
What is the power from an
average coal-fired power plant?
A) around 2 kilowatts (KW)
B) around 2 megawatts (MW)
C) around 2 gigawatts (GW)
D) around 2 terawatts (TW)
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Unit 12 – Energy from the earth - Slide 12
What is the power from an
average wind turbine?
A) around 2 kilowatts (KW)
B) around 2 megawatts (MW)
C) around 2 gigawatts (GW)
D) around 2 terawatts (TW)
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Unit 12 – Energy from the earth - Slide 13
What is the power from an
average wind turbine?
A) around 2 kilowatts (KW)
B) around 2 megawatts (MW)
C) around 2 gigawatts (GW)
D) around 2 terawatts (TW)
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Biomass
Unit 12 – Energy from the earth - Slide 14
• Recycle carbon?
(1) Burn material (2) Distill
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Issues with Biomass
Unit 12 – Energy from the earth - Slide 15
• Just cycle carbon in closed loop
• At the moment, lots of land involved
• Sugar okay, corn not so much
• Diverts crop land away from food (for
animals)
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Cellulosic Ethanol
Unit 12 – Energy from the earth - Slide 16
• Uses cellulosic material (e.g. corn
waste, switch grass)
• Holy Grail of biofuels
• Miscanthus
• Transportation
cost (local)
• Regularity of
supply
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How much comes from renewables?
Unit 13 – Solar Energy- Slide 17
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Biomass
Unit 13 – Solar Energy- Slide 18
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Solar?
Unit 13 – Solar Energy- Slide 19