Lect17 -- Solar

50 per watt and falling installed cost is 5w so a 3kw

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Cost (adjust with tax rebates) Land use Not constant supply Solar Energy Efficiencies Solar heating cells 50-74% Photovoltaic cells 11-15% Plant Photosynthesis 3-5% The costs of solar PV Solar PV is usually priced in dollars per peak Watt •  means full-sun max capacity: how fast can it produce energy •  panels cost $2.50 per Watt (and falling), installed cost is ~$5/W •  so a 3kW residential system is $15,000 •  state rebates and federal tax incentives can reduce cost substantially (< $10,000) To get price per kWh, need to figure in exposure •  4–6 hours per day full sun equivalent: 3kW system produces ~15 kWh per day, or 5475 kWh per year •  if system lasts 25 years: 137,000kWh •  cost: $15,000/137,000kWh ~ $0.11/kWh •  Electricity cost in CA: $0.13/kWh Solar PV should pay for itself… The costs of concentrating solar thermal plants Becoming cost-competitive with fossil fuel alternatives Cost Evolution 1983: 13.8 MW plant cost $6 per peak Watt 25% efficient about 25 cents per kWh 1991: plant cost $3 per peak Watt 8 cents per kWh 1996: Solar One in Nevada cost $266 million produced 75 MW in full sun, ~134 million kWh/year so about $3.50 per peak Watt 10 cents/kWh over 20 years California dominates world for CSP (currently 354 MW) now U.S. has 1000 MW capacity; 500 MW in Spain A big problem: Storage The Sun is not always up Consumers expect energy availability at all times Wider use...
View Full Document

Ask a homework question - tutors are online