1. Non-renewable
1.1. Coal
1.1.1. -takes millions of years to form
1.1.2. -made from plant matter
1.1.3. -(solid) rock containing 60-90% carbon
1.2. Oil
1.2.1. -takes millions of years to form
1.2.2. -(liquid) rich in hydrogen and hydrocarbons
1.3. Natural Gas
1.3.1. -(gas) is a continuation of the petroleum-making process
1.3.2. -takes millions of years to form
1.4. Nuclear
1.4.1. -reactors split uranium atoms to generate heat, which makes steam, which is used to make electricity
2. Renewable
2.1. Tidal
2.1.1. -uses ocean tides to turn a wheel to make electricity
2.2. Solar
2.2.1. -comes from the Sun
2.2.1.1. -passive (e.g., opening the curtains to let the sun shine in and help heat the air)
2.2.1.2. -active (e.g., using solar panels to make electricity)
2.2.2. -continuously radiates the light that supports life on Earth
2.3. Water
2.3.1. -made by moving water turning a wheel or turbine to run a mill or produce (hydro) electricity
2.3.2. -accounts for more than 60% of the electricity used in Canada
2.4. Wind
2.4.1. -obtained from moving air
2.4.2. -windmills used by humans for over 2000 years
2.4.3. -a turbine is the machine that turns flowing air into electricity
2.5. Biomass
2.5.1. -comes from plants and other organic materials (e.g., wood, wood by-products, grasses, corn, oilseed crops and agricultural & crop wastes; "feedstock")
2.5.2. -can be burned to produce heat or converted to fuel (e.g., ethanol)
2.6. Geothermal
2.6.1. -comes straight from the Earth (e.g., vocanoes and hot springs)
2.6.2. -in Canada, the ground is warmer than the air in winter and cooler than the air in summer
2.6.3. can use pumps to draw warmth/coolness from the ground