Large-Scale Solar Photovoltaic Power Generation

Features

Friendly to the Planet

Friendly to the Planet

Electric power is generated from solar energy. It emits no waste, no effluent, no noises and no vibrations.
All the solar power plants that RENOVA operates have the effect of reducing CO2 by around 72,000 tons per year. Absorbing this much CO2 would require as many as five million Japanese cedar trees.

Meeting Electricity Demand of Some 40,000 General Households

Meeting Electricity Demand of Some 40,000 General Households

The total area of all the solar power plants that RENOVA operates is equivalent to nearly 35 times the area of Tokyo Dome baseball stadium. With a total capacity of 143.2 MW, they are capable of generating approximately 146.34 million kWh per year. This capacity is equivalent to the power consumption of around 40,000 general households.

Mechanism

Converting Light Energy from the Sun into Electricity

A solar cell is a device that converts light energy from the sun into electricity.
A solar cell comprises two semiconductors that differ in properties. One is called n-type silicon and the other p-type silicon.
In response to light, solar cells generate positively charged particles and negatively charged particles to produce electricity. Electric power generated at solar power plants is transmitted to households after its voltage and current are modulated.

Electricity Travels from Power Plant to Households

Electricity Travels from Power Plant to Households

Process towards Start of Operation of Large-Scale Solar PV Project

Process of Development of Large-Scale Solar PV Power Generation

  1. Planning(Development Phase)
    • Simulation of power production
    • Facility outline design
    • Revenues and expenses planning
    • Consideration on taking advantage of a subsidy program
  2. Procedures and negotiations(Development Phase)
    • Dialogues with locals
    • Consultations on grid connection
    • Actions for licenses, approvals and notifications
    • Negotiations with the governmental sector
  3. Fund procurement(Development Phase)
    • Consideration of the procurement scheme
    • Detailed project planning
    • Negotiations with financial institutions
    • Application for subsidy
  4. Design and construction(Development Phase)
    • Facility design
    • Selection of equipment
    • Construction management
    • Process management and coordination
  5. Start of operation(Operation Phase)
  6. Maintenance(Operation Phase)
    • Remote monitoring
    • Maintenance implementation

Biomass Power Generation

Features

Friendly to the Planet

Friendly to the Planet

Biomass fuels derived from plant is considered to emit no CO2, based on the idea that the amount of CO2 absorbed by growing trees equals the amount of CO2 emitted during combustion.

After the start of operation, biomass power plants stably supply electric power without being affected by weather or other conditions. The power generation volume may be controlled according to power consumption.

Mechanism

Power Generation Materials Derived from Living Things

Power Generation Materials Derived from Living Things

Biomass power generation burns materials derived from living things to produce high-temperature steam with high pressure that rotates turbines to generate electric power. This production of steam requires the efficient combustion of fuels. If wooden materials with high water content are used, it is common to mix them with appropriate auxiliary fuels before they are burnt. RENOVA’s wood biomass power generation makes use of locally produced unused materials such as fuels and palm kernel shells (PKS) imported from Indonesia, Malaysia and other countries as auxiliary fuel.

Process Towards Start of Operation in Biomass Power Generation Project

  1. Project plan(concept and basic plan: 1 year)
    • Consideration on scale of facility
    • Consideration on location
    • Consideration on fuel procurement, including waste collection and conveyance
    • Consideration on use of products and byproducts
    • Consideration on the operating body
    • Feasibility study
    • Briefing to local community and request for cooperation
  2. Implementation plan(system consideration: 1 year)
    • Determination of scale of facility
    • Consideration on economic efficiency and risk control
    • Consultation with related business operators
    • Determination of the operating body
    • Consensus building with local community
  3. Implementation of the plan(2 to 3 years)
    • Application for operator certification
    • Negotiations with electricity utilities and manufacturers
    • Recognition of facility certification under the FIT scheme
    • Placement of order, design, construction and trial operation
    • Compliance with laws and ordinances
  4. Start of operation

Wind Power Generation

Features

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.

Mechanism

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

Geothermal Power Generation

Features

Generating Power from the Energy of Magma

Geothermal power generation utilizes the thermal energy of magma underneath the ground in volcanic areas. At a shallow depth below a volcano, lie hot magma reservoirs. Their high temperature may heat the rocks and water around them to form geothermal reservoirs. In geothermal power generation, the steam obtained from these reservoirs rotates turbines to generate electricity.

Mechanism

Flash Steam System

A steam separator separates steam only once from geothermal fluid consisting of steam flashed under the ground and hot water. That separated steam turns turbines. Most of the geothermal power plants in Japan use this system. The hot water after separation is returned to underground reservoirs.

Process Towards Start of Operation in Geothermal Power Generation Project

RENOVA aims to pursue the long-term sustainable development of geothermal resources in harmony with local hot springs and the natural environment.

To undertake geothermal reserves surveys, RENOVA will hold continuous discussions with local stakeholders in a bid to gain their understanding.

Before conducting any subsequent survey as a result of the survey findings, RENOVA will again speak with local stakeholders to seek their understanding.

  1. Surface survey(in years 1 to 2)

    Surveying geothermal manifestation

    • Geological and geochemical surveys
    • Geophysical exploration
    • Selection of targets
  2. Underground exploration and evaluation(in years 3 to 5)

    Examining geothermal reservoirs

    • Well survey
    • Fumaroles test
    • Overall analysis
  3. Environmental impact assessment(in years 6 to 9)

    Conserving the environment and complying with laws and ordinances

    • Environmental impact assessment
    • Hot springs impact assessment
    • Licenses and approvals
  4. Construction(in years 10 to 12)

    Building a geothermal power plant

    • Design
    • Construction
    • Trial operation
  5. Operation(in year 13 and later)

    Operating a geothermal power plant

    • Operation
    • Maintenance
    • Reservoir monitoring