Wind Power Generation

Wind power generation converts the kinetic energy of wind, a limitless resource, into electric energy with the use of wind turbines. Operating day and night, friendly to the environment and high in generation efficiency, wind is one of the major means of generating power from renewable energy.

There are two types of wind power generation facilities. Already, a large number of onshore facilities have been constructed in Japan. Offshore facilities will be constructed in the future.

RENOVA considers the development of both onshore and offshore wind power generation projects.


Friendly to the Planet

Friendly to the Planet

A renewable energy source, the supply of wind is limitless. It does not emit CO2 at the time of generating power. Including the offshore option, wind power generation has very high potential.
In 1997, the Act on the Promotion of New Energy Usage came into effect. Subsequently, the Japanese government stepped up its efforts to encourage renewable energy. After the launch of the feed-in tariff (FIT) scheme in 2012, technological development advanced and regulations were relaxed. As such, more wind power plants are likely to be constructed.


Wind power generation converts the rotational energy of wind turbine blades that receive wind into electric energy.
The energy from the blades is amplified by the gearbox in a device called the nacelle, which houses the main components and devices needed to power generation, and is then sent to the generator for conversion into electricity.

This is a highly efficient power generation method. Approximately 30% of kinetic energy turns into electric energy, although the percentage figure varies depending on the equipment.

Size of Wind Turbine

Size of Wind Turbine

With wind power generation, the larger the turbine the lower the power generation costs. Using the latest technologies, wind turbines are becoming larger in size.

A large turbine for some onshore plants has a height, including the length of the blades, that exceeds 130 meters. Amid the trend towards larger-sized turbines, some have a blade diameter ranging from 100 meters to 130 meters.

A height of 130 meters is equivalent to a 30-story building.

Process Towards Start of Operation in Wind Power Generation Project

Process of Introduction of Wind Power Generation

  1. Location survey and business feasibility survey
    • Selection of potential areas
    • Collection of wind condition data in vicinal areas
    • Survey on natural conditions (block designation, power transmission lines, transport route, environmental impact items)
    • Estimation of scale of facility to be introduced
  2. Wind condition survey(1 year or longer)
    • Selection of observation method and point and actual measurement
    • Processing, analysis and evaluation of observation data
  3. Basic design
    • Determination of locations for installation of wind turbines
    • Determination of size of wind turbines
    • Selection of wind turbine models
    • Location and soil surveys
    • Consideration of economic efficiency
  4. Environmental impact assessment(3 to 4 years)
    • Consideration document
    • Scoping document
    • Environmental impact assessment, forecast and evaluation
    • Draft environmental impact statement
    • Environmental impact statement
  5. Implementation design
    • Equipment design
    • Work design
    • Work plan
  6. Consultation with the electric power company
    • Power system interconnection
    • Electricity sales agreement
  7. Construction work
    • Agreement
    • Civil engineering works
    • Wind turbine installation works
    • Electrical works
    • Trial operation and inspection
  8. Start of operation