Subject
energy policy
144
energy economy
122
energy supply
46
energy
39
renewable energy
39
world energy consumption
28
energy demand
26
energy transition
24
energy production
23
energy resource
19
energy system
19
energy statistics
17
energy conservation
16
energy prognosis
16
environmental policy
14
energy consumption
13
energy management
12
future aspect
12
European Union
11
hydroelectric power
11
energy source
10
energy technology
10
geothermal energy
10
nuclear controversy
10
solar energy
10
bioconversion to fuel
9
climatic change
9
coal gasification
9
energy analysis
9
nuclear energy
9
nuclear power
9
renewable energy source
9
energy model
8
wind energy
8
coal
7
energy conversion
7
energy program
7
coal liquefaction
6
cogeneration
6
environment
6
photovoltaic conversion
6
regional energy planning
6
solar cell
6
sustainable development
6
biomass energy production
5
carbon dioxide production
5
electric power generation
5
electricity
5
energy planning
5
energy storage
5
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