About the Start of SEKISUI’s SMARTHEIM DENKI Power Trading Service

An environment-contributing electrical power project by Fusion of SEKISUI HEIM customers (households) and the SEKISUI CHEMICAL Group (corporation)

◆Providing an attractive excess power purchase service for SEKISUI HEIM customers who are no longer covered by FIT
◆Aiming to construct a sustainable system for developing and manufacturing SEKISUI CHEMICAL Group products using customers’ excess power
◆Aiming to further promote the use of renewable energy by utilizing our ability to coordinate and adjust among storage cells

  SEKISUI CHEMICAL CO., LTD. (President and Representative Director: Teiji Koge; hereinafter, “SEKISUI CHEMICAL”) today started offering its customers information about its power trading service, “SMARTHEIM DENKI,” which will begin in September 2019.
  SMARTHEIM DENKI is a service where customers living in SEKISUI HEIM homes can sell excess energy generated through photovoltaic (PV) cells on their houses for use by the SEKISUI CHEMICAL Group in its business activities or for purchase by other SEKISUI HEIM customers. For customers who, starting in November 2019, will no longer be covered by the Feed-In Tariff (FIT) system of fixed-price purchasing, we shall both provide an attractive service for purchasing their excess PV power and study its use within the SEKISUI CHEMICAL Group’s business activities as a way to promote the reduction of greenhouse gas emissions.
  In addition, we aim to develop our own system in the future, not only for excess PV power, by purchasing PV power stored in the storage cells of customer homes, and through the construction of a virtual power plant (VPP) that brings all this power together. This will allow us to contribute to solving the issue of balancing power supply and demand, which is becoming increasingly stark as the spread of PV power is encouraged, while at the same time, study the realization of a service to return the value obtained through the construction of this VPP to our customers.
  Through these efforts, we aim to contribute to the further spread of renewable energy and building of a sustainable society.

Overall image of SMARTHEIM DENKI



1) After FIT

  Homes with PV installed that are no longer eligible for the Feed-In Tariff (FIT) (“After FIT homes”) will start appearing from November 2019. Around 540,000 homes throughout Japan are expected to become After FIT homes in 2019, with SEKISUI HEIM homes accounting for around 60,000*1, or more than 10%. In addition, another 10,000 SEKISUI HEIM homes or more per year are expected to become After FIT homes from 2020. With the end of FIT, the sale price of excess power will drop sharply. This means that ideally, After FIT homes should use PV power as much as possible within the home, and any excess power will be sold under new conditions.

2) Renewable energy popularization and issues

  According to the government’s promotion policy, as of FY2016 renewable energy reached around 15% of all electrical power in Japan. However, the amount of energy generated using PV varies greatly according to the weather or time of day, so issues such as worries over large-scale blackouts and increases in opportunities to use greenhouse gas-emitting thermal power generation to adjust the supply and demand balance are becoming increasingly stark as PV use spreads.
  We need to solve these issues to further popularize the use of renewable energy.
  Therefore, since FY2010, SEKISUI CHEMICAL has been carrying out demonstration tests for energy management that allows power to be routed flexibly between multiple homes through the remote automated control of home-use storage cells, working on initiatives to verify VPPs that can bring together the electricity from home storage cells in multiple homes, and proposing systematic methods to bring this to fruition.

3) SEKISUI CHEMICAL Group’s environmental management

  The SEKISUI CHEMICAL Group promotes environmental management based on contributions through three activities, “Expand and create Environment-Contributing Products,” “Reduce environmental impacts,” and “Conserve the natural environment,” based on our long-term environmental vision, SEKISUI Environment Sustainability Vision 2030. In particular, we focus our efforts on contributing to the environment through businesses and products developed under “Expand and create Environment-Contributing Products,” and have been actively developing and spreading energy self-sufficient homes that include solar panels and storage cells. We have sold a total of some 200,000 homes with solar panels and some 19,000 storage cells.*2
  In addition, we provide energy saving investment incentives program (12 billion yen over FY2017–FY2019), and are expanding our initiatives to effectively reduce greenhouse gas emissions. Moreover, in June 2018 we obtained the first world’s first SBT Initiative certification in the chemical sector, and are promoting the reduction of greenhouse gas emissions not only at SEKISUI CHEMICAL but throughout our supply chain.

About our SMARTHEIM DENKI power trading service


(1) To provide an attractive excess power trading service for SEKISUI HEIM customers whose homes are no longer eligible for FIT
  SEKISUI CHEMICAL recommends energy self-sufficiency lifestyles through the use of storage cells to its customers whose homes will no longer be eligible for FIT, in consideration of the importance of balancing both ecology and economy. An analysis of past electricity production and consumption data*3 shows that around 2,100 kWh of the annual 5,400 kWh of electricity generated can be consumed in the home during the day, while the remaining 2,300 kWh or so can be stored in storage cells and used at night. However, it is estimated that around 1,000 kWh of electricity are not stored in the storage cells, but sold as PV excess power, so we will provide a welcome route for After FIT homes to deal with this.

〔Average PV power generation and its use in customer homes*3〕


(2) Social contributions toward achieving a renewable energy society
  Excess power purchased from SEKISUI HEIM customers is supplied to other customers as well as used effectively to bring about a sustainable society. For example, by using this power in SEKISUI CHEMICAL Group plants and offices in Japan, we can provide the world with new SEKISUI HEIM and other products produced using zero-greenhouse gas emissions electricity.
  In addition, we need to ensure a suitable ability to adjust electricity supply to cope with changes in the production of renewable energy in the overall power system if we want renewable energy to become more common. Therefore, by FY2020 SEKISUI CHEMICAL will construct a VPP, which can be considered as a single power plant formed by the multiple storage cells installed in SEKISUI HEIM customers’ homes. This will allow us to aim to create a service to return some value to our customers for their cooperation to a VPP.


(1) Power purchase service

●Purchase target
  Excess power generated from solar panels on SEKISUI HEIM customers’ homes

●Planned purchase price (Note 1)
  The price will be set at a level that encourages self-sufficiency through storage cells
  ・Customers with solar panels and storage cells (Note 2): 12 yen/kWh
  ・Customers with solar panels only:9 yen/kWh
  Note 1: The purchase price until March 2021 for customers whose homes are no longer eligible for FIT by March 2020.
  Note 2: Customers who have purchased and installed storage cells/VtoH from domestic SEKISUI CHEMICAL Group companies.

(2) Power sales service

●Sales (supply) targets
  Customers living in SEKISUI HEIM homes, SEKISUI CHEMICAL Group companies
  *The sale price will be announced in July 2019.

(3) Service utilizing storage cells (VPP)

  Currently being developed for commercialization

3) Service introduction schedule

April 15, 2019
    Information sent to customers whose homes will no longer be eligible for FIT in FY2019
    Provisional application for excess power purchase starts

July 2019
    Information on full application sent to customers making provisional applications / Full application starts

September 2019
    Power sales start (limited to the TEPCO/Chubu Electric Power areas)

November 2019
    Nationwide sales and purchasing starts

Business goals for SMARTHEIM DENKI

1) Amount of power purchased/sold

    143,000 MWh/year (FY2021)
      Equivalent to the power needed for the production of 12,000 SEKISUI HEIM houses
    675,000 MWh/year (FY2030)
      Equivalent to the power demand of the SEKISUI CHEMICAL Group’s 73 domestic bases including plants and offices (as of FY2017)

    179,000 MWh/year (FY2021)

2) Number of contracts

    55,000 contracts (end of FY2021)
    186,000 contracts (end of FY2030)

    38,000 contracts (end of FY2021)

  *1 Homes where FIT ends in 2019 will have a purchase price applied of 48 yen/kWh (including tax).

  *2 As of the end of December 2018. As surveyed by SEKISUI CHEMICAL.

  *3 Estimated at an average electricity consumption of 8,800 kWh a year and 8 kWh of storage cell capacity, based on HEMS data from 246 homes in the Kanto region.


Headquartered in Japan, SEKISUI CHEMICAL CO., LTD. (TSE: 4204) and its subsidiaries make up the SEKISUI CHEMICAL Group. 26,000 employees in over 200 companies throughout 21 countries aim to contribute to improving the lives of the people of the world and the earth’s environment. Thanks to a history of innovation, dedication and a pioneering spirit, SEKISUI CHEMICAL now holds leading positions in its three diverse business divisions as well as top global market share in interlayer film, foam products, conductive particles and more.
Since its foundation in 1947, the SEKISUI CHEMICAL Group has dedicated itself to social and environmental contribution and is now an internationally recognized leader in sustainability and environmental initiatives, having recently been selected as one of the Global 100 most sustainable companies. SEKISUI CHEMICAL Group will continue to maintain a strong corporate presence for 100 years and beyond.

Press Contact

Public Relations Department
Fax: +81-(0)3-6748-6547


This press release may contain forward-looking statements. Such forward-looking statements are based on current expectations and beliefs and are subject to a number of factors and uncertainties that could cause actual results to differ materially from those expressed or implied by such statements due to changes in global economic, business, competitive market and regulatory factors.