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BI PV Urban Scale Project Details
Name projectCosmo-Town Kiyomino Saizu
Year2001-00-00 (Start operation date)
PV applicationInclined roof - integrated: PV roof tiles
PV power total kWp
LocationYoshikawa, Saitama
Latitude/Longitude35°53'54"N 139°51'22"E
© MSK corporation

Project summary
Kiyomino is located in the northeast of Yoshikawa-city, Saitama, and is approximately 20km from the center of Tokyo. The area has been developed toward a comfortable living environment of 21st century and its concept is “human-friendly town development”. Hakushin corporation was allowed to develop and sell 79 houses in the area. Then, they decided to develop a PV community, e.g. all houses equipped with PV systems.

Urban scale PV aspects
Kiyomino is located not far from Tokyo, and is a modern urban area in which both comfortable living and environment-friendly town is promoted. The development of Kiyomino area was planned and promoted by the Urban Renaissance Agency of Japan (the UR). Hakushin corporation was inspired by the Nieuwland 1MW urban PV project in the Netherlands. Hakushin corporation developed 79 houses with a PV roof of 3 kWp each in the area. The community was one of advanced and practical cases of ‘PV community’ and was given ‘New Energy Award in FY2002’ in Japan.

Special PV project info
PV architecture and building integrationTo create a well-designed appearance of the houses and a harmonized streetscape as a community, well-integrated PV modules into the roof were required, as well as satisfying fundamental facilities of ‘roof’ is indispensable. From the viewpoints, design of PV modules, technological reliability on developing and installing roof materials and the cost were comprehensively evaluated for selecting PV module manufacturer. Originally, roofing geometry of houses was a gable roof design. However, the design was changed to a shed roof to maximize PV system electricity generation and still creating well-designed roofs.
Urban planning issues
Economical and financial issuesThe development plan of Kiyomino area given by the UR defined the averaged sale price of the houses in the area. To realize the price level, the costs of house itself and various kinds of equipment, including PV system had to be reduced. Drawing up a cost-effective construction schedule was a promising cost reduction measure and installing many PV systems in a limited area also reduced installation cost. The PV system received a governmental subsidy, available through Japan’s residential PV program.
PV ownershipBuilding owner: inhabitant; PV owner: inhabitant; PV energy user: inhabitant;
Tariffs and meteringNet-metering
After starting operation, a net-metering scheme was applied so that surplus PV is traded between the inhabitant and the utility company, at the same price of the residential electric tariff.
Info on grid issuesTo avoid negative influences on the grid network caused by a high-density of PV systems installed in a limited area, a precise negotiation with a utility company (Tokyo Electric Power corporation) was implemented and the design of grid-connection was decided below; - each PV system (each house) has each point for grid-connection (LV line) - one transformer for four PV systems - enhancement of a capacity of transformer The negotiation with the utility company was in charge of PV system provider for the community.
Other infoThe community project has been contributing not only to deploying areal PV system installation in residential area but also to increasing publicity of the project companies. The concept of the community development and equipping PV systems was well accepted and handed down to the inhabitants. Some of houses in the community were also equipped with a high-efficiency electric water heater, called “Eco-Cute”. According to the recent interview, the inhabitants’ concern about environmental problems and motivation of energy saving have been growing.
Remarks and recommended readingOther project company: Kubota corporation, Fuji-desgn Co., Ltd.

Other project data
Type of projectCommercial project
Other relevant aspects
Start of PV project
Start operation PV system2001-00-00
Main project leading companyHakushin Co., Ltd. and Urban Renaissance Agency
Main project contact person
Contact email
Contact addressMSK corporation, Shinjuku, Tokyo, 160-0023, 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 applicationInclined roof - integrated: PV roof tiles
PV power total urban project239 kWp
Number of dwellings/units79
PV power per dwellings/units3 kWp
Main PV system typesGrid-connected - demand side
Main PV module typesPV building elements - PV roof tile
Main PV cell typesAmorphous silicon
PV module brand and typeKubota corporation
PV inverter brand and typeKubota corporation

PV cost and energy production
Total PV system investment15000 Euro
Average PV modules only costs
Total PV energy yield3106 kWh Calculated
PV energy user owner

Projects websitehttp://www.hakushin.com
Other websites http://www.msk.ne.jp/
Webpage Educational Tool

1. Cosmo-TownKiyominoSaizu.pdf (language: English)

(PV) rooftops, (PV) roof tiles