Generating power on logistics warehouse roofs and sending it to offices: the 'equipment leasing model' adopted by a Mitsui & Co.-affiliated fund

• Published 2026.10.01, Business Journal; cooperation: real estate journalist Tomoki Akita.

Four-company rooftop solar scheme

• In September 2026, four companies signed a basic agreement:
• Mitsui & Co. Realty Management (MBRM)
• e-dash
• West Energy Solution (wholly owned subsidiary of West Holdings)
• JERA Cross
• Mechanism:
• Rooftop power from MBRM logistics facilities is first self-consumed on site (onsite PPA).
• The surplus is sent via offsite physical PPA to MBRM offices, commercial facilities and hotels.
• Any shortfall is procured through a competition among multiple suppliers.
• Equipment leasing model: the property owner makes the initial investment and leases the equipment to the generator.
• Target: 10MW+ of generation capacity by March 2028.
• Roles:
• MBRM: property information and tenant coordination.
• e-dash: overall project management.
• West Energy Solution: EPC, O&M and generation business.
• JERA Cross: retailer/aggregator taking surplus power and supplying it to demand facilities.
• Akita quote: leasing equipment adds equipment rent to NOI and may be reflected in appraisals. Issues include roof waterproofing warranties, removal costs at roof renovation and tenant consensus.

Market background

• Teikoku Databank: 8 renewable generator bankruptcies in FY2024, double the prior year. Together with 44 closures/dissolutions, a record 52 exited the market.

West HD company history

• Founded 1981 in Hiroshima as a housing materials trader.
• Entered residential solar in 2005.
• Grew through megasolar EPC after FIT began in 2012.
• Sales peaked at ¥58.8bn in FY to Aug 2014.
• This term merged West Energy Solution and West O&M.

Ties to Mitsui group and JERA Cross

• e-dash was founded by Mitsui & Co. in February 2022.
• West HD announced an investment in e-dash on August 31.
• On September 9, it announced a partnership agreement with e-dash, Mizuho Bank, JA Mitsui Leasing and Mitsui & Co.
• Partnered with JERA Cross on domestic solar PPA in March 2025.

Curtailment background

• Kyushu curtailment rate reached 4.8% (750 million kWh) in FY2024.
• Curtailment is expected to expand in all areas except Tohoku.

West HD storage business

• In FY to Aug 2025, shifted nearly half of management resources to storage.
• Completed development/sale of 10 grid storage sites 2 years ahead of plan.
• Plans ¥110bn investment in storage development by FY2027.
• Standard adoption of TMEIC (Toshiba–Mitsubishi Electric JV) systems; mid-size projects (2MW/8MWh) at 20 sites nationwide.
• Toshiba Energy Systems handles aggregation:
• price forecasting
• charge/discharge planning
• control
• market monetization

First extra-high-voltage storage plant (Akitakata)

• Adjacent to a megasolar in Akitakata, Hiroshima; began receiving power on April 1, 2026.
• About 10,000kW output.
• Will trade first on the wholesale market, then expand to the balancing market and others.
• Plan: 6 extra-high-voltage storage sites totaling 770MWh by FY2030.

Financials

• FY Aug 2026 interim storage segment: sales ¥3.046bn, operating profit ¥911m.
• Analyst Toshiya Saeki: storage revenue combines wholesale spreads, the balancing market and the capacity market. Develop-and-sell and own-and-operate businesses carry different risks.
• FY Aug 2026 plan: sales ¥54.46bn, operating profit ¥11.376bn.
• Q3 progress: 53.9% of sales and 40.6% of operating profit.
• Interest-bearing debt over ¥93.3bn; equity ratio 23.5%.
• In November 2024, disclosed a material weakness in internal control over financial reporting.
• Analyst Takeshi Horino: watch conversion of the pipeline into deliveries and funding costs as rates rise.

Outlook

• West HD and Toshiba ESS are jointly considering a new service adding batteries to existing power plants.