Learning more on energy

Is energy used economically?

Energy in Japan is sent via energy conversion sector such as oil refinery, power generation plant and city gas production, then consumed by three major sectors such as the industrial sector (plants, etc.), the residential and commercial sector (households, offices, etc.) and the transport sector (carrying people and goods). And energy consumption efficiency in each sector has been improved recently.

Final energy consumption by sector

non-energy 1.4%

the Energy Conservation Center, Japan, "2011 EDMC Handbook of Japan's & World Energy & Economic Statistics"

Industrial sector

Iron is utilized much around us; for example, constructions like buildings, bridges or tunnels, vehicles like trains or automobile, and electronic appliances like washing machine or refrigerators. For manufacturing iron-and-steel-products, iron is extracted from iron ore, then manufactured into steel to make it flexible and easy to process. Steel is processed to steel products through rolling. Through these overall processes, it is essential to produce iron efficiently with less energy.
Energy efficiency in Japan is highest among the world, and boasts world-leading energy- saving technology.
High energy efficiency means low CO2 emissions that may cause global warming.

Cement is widely utilized too, for example, constructions like buidings, schools, bridges, tunnels, roads, airports, harbors, levees or dams.
Although it is actually used in a form of concrete, cement is a key material for determining the handleability in construction, strength, life and cost of concrete.
At the beginning of the cement production process, limestone, clay and rubbish are mixed and heated to manufacture an interim product called clinker, then it is ground and mixedwith gypsum to produce cement.
It is also important here to manufacture clinker efficiently with less energy.
Cement industry in Japan also boasts world's highest energy efficiency with highest level of technology.

What do we use energy for?

Residential and commercial sector

Transport sector 25%

  • 01 Where is energy from?
  • 02 What do we use energy for?
  • 03 Is energy used economically?
  • 04 The future energy technologies


  • Fossil-fuel Energy
  • Non-energy use
  • Watt (W) vs. Watt-hour (Wh)