CHANGES IN ELECTRIC GENERATION

1
CHANGES IN ELECTRIC GENERATION

• Generation vs. Demand
• Demand growing 3 per year
• New Generation more difficult to build

2
Generation

• Large, Centralized Plants (Old Way)
• Small, Distributed Plants (New Way)
• Also, Site Renewable Generation where it makes
  Sense (and Profit)

3
Large Plants

• Environmental Issues
• Fossil Fuels
• Location/Siting

4
Large Plants (Cont.)

• New Ideas
• Wind,Solar,Geothermal,Biomass
• Oceanic Thermal Energy
• Extra-Terrestrial Wireless Transmission

5
WIND

• Wind Generators currently very popular
• More and more Cost Effective
• Not a Cure-All - never windy when you need it
  most

6
Wind Farm

• Current Standard 1.5 MW WTG on 80 meter Towers
• Energy cost now in the 4 cents/KWH range

7
Solar

• Photvoltaics
• Electricity Directly from Sunlight
• Low Conversion efficiency
• Fairly High Cost
• Solar Thermal - Solar One
• Could yet show some promise
• ONLY WHEN THE SUN SHINES

8
Geothermal

• Hot Water from the Earth
• Use the Hot Water or Flash to Steam
• Currently 2700 MW capacity in US
• Capacity growing at 9 worldwide
• Excellent for Home Use - Heat Pumps

9
Binary-Cycle Plant (Geothermal)
10
OTEC

• Extract solar heat from Ocean Water
• Flash it to Steam for Turbine/Generator
• Can be combined with DeSalination
• Costly

11
Microwaves from Space

• Large Solar Power Satellites (SPS) in Earth Orbit
• Beam electricity to earth-based Receiver Antenna
  using Magnetron at Gigahertz Frequencies

12

• Typical Energy Costs for Various Generation
  Sources
• Type Installed Cost Energy Cost
• Fuel Cells 15,000-20,000/kW 15-20 cents/kwh
• Solar - PV Cells 6,000-8,000/kW 12-15
  cents/kwh
• Geothermal 5,000-10,000/kW 8-10 cents/kwh
• Biomass 2,000-2,500/kW 3-5
  cents/kwh
• Wind 1,000-2,000/kW 3-5
  cents/kwh
• Natrl Gas (Turbine) 1,500-1,800/kW 2-4
  cents/kwh
• Coal 1,500-2,000/kW 1.5-2 cents/kwh
• Hydro 2,000-3,000/kW 0.2-0.5 cents/kwh

13
Distributed Generation

• Make Electricity where and when needed
• Wind, Solar, Geothermal, Biomass
• Fuel Cells
• MicroTurbines

14
Microturbines

• Run on Natural gas Short Sighted?
• 30-50 kilowatt Designs
• Create both Electricity and Hot Water
• Small businesses, collection of homes

15
Fuel Cells

• Most common type PEM
• Polymer-Electrolyte Membrane
• Strips Electrons from Hydrogen to make
  Electricity
• Safety/Cost
• Where to get H2??
• H2 Energy Density

16
DEMAND SIDE

• Conservation Through
• Market Pricing
• Efficient Products

17
Market Pricing

• Energy Prices becoming De-Regulated
• New Equipment to Automate Pricing
• Smart Meters
• Smart Appliances

18
Smart Meters

• Talks to Electric Company
• Records Hourly Prices
• Tells Appliances what current Price is
• Shops Around for a Better Rate?

19
Efficient Products

• Smart Appliances run only when energy is
  cheapest, talk to each other
• Superconductors
• Cars

20
Superconducting Motors

• Extremely Efficient - Zero Electric Losses
• Very High Torque - 140X increase in Power Density
• Costly?
• Not very Rugged - Bismuth-Cu Ceramic Tape
• US Navy Loves Them

21
Other Superconductors

• Transformers
• Transmission Lines
• Potential Savings
• Between 5 and 10 of all Electricity Generated is
  lost in Transformers and T-Lines

22
Cars

• EVs - Electric Vehicles
• Biggest Problem is Energy Density
• Battery Powered - Poor Range/Heavy
• Fuel Cell Pwrd - Hydrogen is volatile, has poor
  energy density and no delivery system, LNG has
  emissions
• Hybrids - LEVs
• Just appearing on Market
• Good Next Step
• 30 MPG SUV

23
CONCLUSIONS

• More of the Same Old Stuff
• More New Stuff
• Greater Emphasis on Environmental Factors
• Conservation is Key
• Wireless, Wireless, Wireless

24
WEB References

• National Renewable Energy Labs
• http//www.nrel.gov/
• Electric Power Research Institute
• http//www.epri.com/
• US Dept. of Energy
• http//www.energy.gov/
• Electric Vehicles
• http//www.evworld.com/