Otsuka Group Commences Operation of Behind-the-Meter Battery Storage System

Enelis Co., Ltd. (headquartered in Chiyoda-ku, Tokyo; President and CEO: Goro Suzuki, hereinafter "Enelis") has commenced support for the operation of a behind-the-meter battery storage system at a factory site of the Otsuka Group in Hokkaido, in collaboration with Otsuka Holdings Co., Ltd. (headquartered in Chiyoda-ku, Tokyo; President and CEO: Makoto Inoue) and TESS Engineering Co., Ltd. (headquartered in Yodogawa-ku, Osaka; President and CEO: Toshihiro Takasaki), starting in July this year.

Enelis is responsible for the operation of the battery storage system and supports the Otsuka Group in achieving carbon neutrality by maximizing the utilization of electricity generated from on-site solar power facilities.

【Overview of the Initiative】

The battery storage system has been installed within the premises of an Otsuka Group factory located in Hokkaido. This enables the promotion of self-consumption of generated electricity, storing surplus power produced during the day in batteries for use during nighttime operations. No reverse power flow to the grid occurs, and all renewable energy generated is consumed entirely within the same facility.

【Enelis' Role】

Enelis creates battery charge-discharge plans by combining accumulated historical demand data with solar power generation forecasts. By integrating these plans into demand-supply management, Enelis supports optimal battery utilization across the entire Otsuka Group's Hokkaido operations.

Battery operation services are provided using Enelis' proprietary distributed energy resource control system (ene GX DERMS).

① PV Generation Forecasting

② Charge-Discharge Planning

(a) Reliable absorption of surplus power (daytime): Predicts the timing and volume of surplus power based on generation and demand forecasts. Assesses available battery capacity and formulates charging plans.

(b) Discharge control to enhance self-consumption rate (evening to nighttime): Issues discharge commands aligned with peak factory demand periods to reduce grid electricity purchases and increase renewable energy self-consumption.

(c) Develops charge-discharge plans that combine surplus power utilization with charging during low-demand nighttime hours, maximizing battery utilization and cost-effectiveness.

③ Charge-discharge control based on the plan

④ JEPX trading based on charge-discharge plans (within demand-supply management scope)

⑤ Acquisition of performance data via gateway (GW)

⑥ Charge-discharge instructions following participation in the capacity market

【Future Outlook】

This initiative represents an extremely advanced and complex project in Japan, combining behind-the-meter and solar-integrated battery operation with the unique model of the consumer itself acting as a PPS (Power Producer and Supplier) to operate the battery system.

Enelis will continue to drive the wider adoption of renewable energy alongside the Otsuka Group and contribute to achieving carbon neutrality across society.

Otsuka Holdings Co., Ltd. (otsuka.com)

The Otsuka Group, with Otsuka Holdings Co., Ltd. as its holding company, identifies unmet or latent needs and challenges related to health, providing a wide range of products and services from disease treatment to prevention, health maintenance, and enhancement. Regarding the environment, the group has established its 2050 Environmental Vision "Net Zero," aiming to eliminate all environmental impacts from business activities. In the key environmental area of "carbon neutrality," the group promotes the introduction of CO2-free electricity, utilization of renewable energy from solar and wind sources, and improved energy efficiency through cogeneration systems, contributing to the realization of a decarbonized and sustainable society.

TESS Engineering Co., Ltd. (tess-eng.co.jp)

A consolidated subsidiary of TESS Holdings Co., Ltd., founded in 1973. With the management philosophy of "Total Energy Saving & Solution" toward achieving a sustainable society, the company focuses on "mainstreaming renewable energy," "thorough energy saving," and "energy smartification." It operates two core businesses: (1) an engineering business providing EPC services for energy plants and utility facilities, and (2) an energy supply business involving ownership, operation, and power sales of renewable energy power plants, operation and maintenance (O&M), retail electricity supply, and supply of resource-circulating biomass fuel. The company provides comprehensive solutions to address environmental, energy-saving, and energy cost challenges faced by industrial customers.

Enelis Co., Ltd. (eneres.co.jp)

A subsidiary of au Energy Holdings Co., Ltd. and an affiliate of Electric Power Development Co., Ltd. (J-POWER). Since its founding in 2004, Enelis has leveraged its expertise in demand-supply management to provide various services supporting efficient energy use. Since 2016, it has participated in the Ministry of Economy, Trade and Industry's VPP demonstration projects. In 2019, it developed its proprietary VPP platform (DERMS) that centrally controls distributed energy resources via IoT, and in 2021 launched its "VPP Platform Service." Since 2018, it has participated in the Demand Response (DR) service 'Power Source I Prime' (adjustment capability tender), and in 2021 added an energy-saving reward service to its DR offerings. In April 2022, it was certified as Japan's first Aggregator (Specific Wholesale Electricity Supplier). It currently supplies into the capacity market and demand adjustment market as an aggregator. In September 2023, it declared carbon neutrality by aiming for net-zero GHG emissions from business activities by FY2030.

[1] Consumer-led PPS: A model where the electricity consumer itself becomes a PPS (Power Producer and Supplier) to supply power to its own company or group.