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BI PV Urban Scale Project Details
Name projectSekisui Harmonate-town Tsuru-no-ura
Year2005-00-00 (Start operation date)
PV applicationFlat roof - mounted & mechanical fixing,
Inclined roof - mounted
PV power total kWp
LocationKurashiki, Okayama
Latitude/Longitude34°32'53"N 133°42'37"E
© Sekisui Chemical Co., Ltd.

Project summary
Sekisui Harmonate-town Tsuru-no-Ura is located in Okayama prefecture. In 2005, 16 houses equipped with PV system were sold and presently another 16 houses are being sold in lots. In December 2006, 19 houses in total were being built.

Urban scale PV aspects
The area is 7 400 m2 in total and consists of 32 house compartments. In the near future, the PV community consisting of 32 houses, all equipped with PV systems will be completed.

Special PV project info
PV architecture and building integrationThe compartments before building houses were sold with a carrying option to build an all-electric house equipped with PV system, then each house was designed and built on the compartment according to users’ (inhabitants’) requirements.
Urban planning issuesThe electric power lines in the area were installed underground creating an open environment appearance.
Economical and financial issuesA net-metering scheme has been applied and surplus electricity from the house is being traded between the inhabitant and the utility company, at the same price of electricity tariff for residentials. For the all-electric house, electricity tariff structure is different than usual. The daytime rate is higher, while in nighttime the tariff is discounted. This means the value of the PV electricity from inhabitant to the utility company is higher. Additional significant energy bill reductions resulted from energy conservation measures of high thermal insulation and high efficiency equipment.
PV ownershipBuilding owner: Inhabitant. PV owner: Inhabitant. PV energy user: Inhabitant.
Tariffs and meteringNet-metering
Info on grid issuesTo avoid negative influences such as an over-voltage phenomenon caused by a high-density of PV systems installation in a limited area, a precise negotiation with a utility company (Chugoku Electric Power corporation) was implemented. As a result, the PV system capacity was limited to not exceed 4 kW/house. The electricity distribution line in the area was designed and constructed by the utility company.
Other infoIn addition to thermal insulation performance satisfying the energy conservation standards, all-electrified houses were standardized. Not only PV system but also a high-efficiency electric water heater, called “Eco-Cute”, was equipped in all houses. These advanced facilities caused a high price of the houses, however the added value of the houses and the community was highly-regarded as a property value. As well as each inhabitant’s environmental consciousness, it is expected the extensive consciousness and actions for environment as a community will be developed.
Remarks and recommended readingEnergy yield per year: 1 000 kWh/kW/year (calculated). 25 houses with in total 98 kWp (as of Apr. 2007). Sekisui Chemical Co.: Tel: +81-3-5521-0575 FAX: +81-3-5521-0597.

Other project data
Type of projectCommercial project
Other relevant aspects
Start of PV project
Start operation PV system2005-00-00
Main project leading companySekisui Chemical Co., Ltd.
Main project contact person
Contact email
Contact addressSekisui Chemical Co., Ltd., Minato-ku, Tokyo, 105-8450, Japan
Includes PV database projects

Urban district data
Kind of urban areaResidential - urban
Main building typesHouses - single house
New/Retrofit/AddedNew building integration
Main PV area address

PV systems
PV applicationFlat roof - mounted & mechanical fixing,
Inclined roof - mounted
PV power total urban project98 kWp
Number of dwellings/units25
PV power per dwellings/units4 kWp
Main PV system typesGrid-connected - demand side
Main PV module typesFramed - regular module
Main PV cell typesCrystalline silicon - multi,
Crystalline silicon - mono
PV module brand and typeSharp corporation
PV inverter brand and typeSharp corporation

PV cost and energy production
Total PV system investment500000 Euro
Average PV modules only costs
Total PV energy yield0 kWh
PV energy user owner

Projects website
Other websites
Webpage Educational Tool

1. SekisuiHarmonate-townTsuru-no-ura.pdf (language: English)

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