coal    oil    natural gas   sunlight   wind  biomass
electricity
charcoal biofuels
LPG/propane
Sources
    Extraction
    Treatment
Conversion
Technologies
Distribution
Service
Technologies
Carriers
(fuels)
  Services
Electricity,      grid, 
 
    truck, 
railway,
 women
light bulb, automobile, refrigerator, gas stove, arc welder, water pump
Architecture of the Energy System
communication
transportation
keeping warm/cold
food
health care
security
potable water
consumer goods
Coal mining,        tree felling,       oil/gas recovery etc  
Coal/gas fired power plant,  photovoltaic  panels wind turbines,  biogas digester