The Importance of Improving Energy Efficiency

Efficiencies

Using Solar Energy to Provide Heat and Electricity  Passive solar heating  Active solar heating

Using Solar Energy to Provide High- Temperature Heat and Electricity  Solar thermal systems -tracker/concentrator or power towers  Solar thermal systems -tracker/concentrator or power towers  Photovoltaic (PV) cells

Producing Electricity from Moving Water  Large-scale hydropower  Small-scale hydropower  Pumped-storage hydropower  Tidal power plant  Wave power plant

Producing Electricity from Wind

Producing Energy from Biomass  Biofuels  Biomass plantations  Crop residues  Animal manure  Biogas  Ethanol  Methanol

Geothermal Energy  Geothermal reservoirs  Dry steam  Wet steam  Hot water  Molten rock  Hot dry-rock zones

Geothermal Reservoirs

The Solar-Hydrogen Revolution  Extracting hydrogen efficiently  Storing hydrogen  Fuel cells

Electric and Hybrid Cars  Rechargeable battery systems  Hybrid electric-internal combustion engine  Fuel cells

Solutions: A Sustainable Energy Strategy