Tensor Energy

Renewable energy and battery operations · Last updated 2026-07-29

Notes compiled from publicly available sources. Last updated: 2026-07-29. Every figure is linked to the source it came from and dated. Verify against primary sources before relying on them.

TL;DR

Tensor Energy (Tensor Energy株式会社) is a Fukuoka-based company founded in November 2021. It develops Tensor Cloud, a cloud platform for renewable energy operators covering generation forecasting, financial simulation, asset management, battery charge/discharge optimization, and electricity market trading.

  • As of 2026-07-27, the platform covers 194 MW across 1,000+ power plants and battery sites; as of 2026-04-02, 30+ operators and aggregators were customers.
  • Total funding ¥1.7B, most recently a ¥950M Series A closed 2026-04-02, led by Global Brain.
  • Team size ~18 across 9 countries (2026-04-02). Internal working language is English (TokyoDev; Undated; accessed 2026-07-29).
  • Backend is Go on AWS serverless; engineering roles have been advertised as not requiring Japanese (job posting, TokyoDev listing; Undated; accessed 2026-07-29).

Basic

Item Detail Source
Legal name Tensor Energy株式会社 / Tensor Energy Inc. company page
Founded November 2021 company page
HQ ONE FUKUOKA BLDG. 7F, 1-11-1 Tenjin, Chuo-ku, Fukuoka 810-0001 company page
Representatives Nana Hori (堀 菜々), Vincent Filter (フィルター ヴィンセント) 2026-04-02
Headcount ~18, across 9 countries 2026-04-02
Internal language English TokyoDev; Undated; accessed 2026-07-29
Customers 30+ power producers and aggregators 2026-04-02
Assets on platform 194 MW, 1,000+ sites 2026-07-27
Total raised ¥1.7B 2026-04-02
Investors Genesia Ventures, Delight Ventures, Global Brain, Globis Capital Partners, Mizuho Capital, Fukuoka Financial Group, Plug and Play company page

The company page and TokyoDev profile are continuously updated pages without publication dates; both were accessed on 2026-07-29.

Programs and awards announced by the company: J-Startup KYUSHU (2023-04-18), Plug and Play Japan Winter/Spring 2023 Batch (2022-12-01), JETRO Global Startup Acceleration Program (2024-09-03), ASEAN market-entry support program (2024-08-09), High Growth Program FY2026 (2026-06-05). The company was based at Fukuoka Growth Next, where two of its investors were introduced (BRIDGE, 2024-04).

Market context as stated by the company

From the Series A release, 2026-04-02:

  • Japan's energy self-sufficiency rate was approximately 13% (FY2022, Agency for Natural Resources and Energy).
  • Output curtailment of solar and wind has spread to all 10 grid areas; the Tokyo area saw its first curtailment on 2026-03-01.
  • From April 2026, small-scale batteries and generators became eligible to participate in the balancing market (需給調整市場). A bill amending the Electricity Business Act was approved by cabinet in March 2026.

Product

Tensor Cloud is documented publicly at docs.tensorenergy.jp. Feature areas, per the documentation:

Development / simulation

Simulations with CAPEX and OPEX libraries, scenarios, price forward curves, solar and battery models, curtailment, FIP, financial and weather models, and SPV settings.

Asset management

Asset list, map, timeline, settings, bulk upload, tags, files, data coverage; accounts; contract management for PPAs and bilateral agreements.

Operations and trading

Forecasts, balancing groups, balancing plan submission, generation data upload, JEPX trading, and battery optimization.

Commercialization

The product is commercialized as a paid subscription with a fully published price list. The current version is dated January 2026; an earlier version dated June 2023 remains online, so the pricing model has been revised at least once.

The structure combines a monthly workspace subscription with unlimited users, capacity-based fees per registered kWp for forecasting and asset management, and volume-based fees for aggregation support. Aggregation is offered in two variants: a SaaS plan where the customer handles JEPX trading itself, and a BPO plan where Tensor Energy runs the operation.

Reported scale over time

Date Reported figure Source
2024-04 152 solar sites; target 400 by end of 2024 BRIDGE
2024-09 170+ solar sites Ambitions
2026-04-02 800+ sites; 30+ operators and aggregators; 21 months of solar+battery operating history PR TIMES
2026-07-27 194 MW, 1,000+ sites, including 1,051 low-voltage solar sites; 2+ years of operating history for high-voltage solar+battery PR TIMES

Announced customers and partners

Date Party Detail
2024-06-03 Kyocera TCL Solar Solar + battery facility in Kumamoto begins operation; described in the 2026-07-27 release as Japan's first large FIP co-located battery
2025-03-10 Tokyo Century Demand-forecasting-enabled Tensor Cloud for onsite PPA and FIP surplus sales
2026-02-03 — Low-voltage solar bulk operation support business launched
2026-02-18 — Selected for a low-voltage solar "FIP conversion + battery" feasibility validation project
2026-03-16 Univers Low-voltage grid battery bulk operation aggregation business
2026-03-30 KS Energy (Higo Bank group) FIP co-located battery aggregation, DC-link method
2026-04-07 — Support for JEPX new system migration
2026-06-29 — Started recruiting EPC partners for FIT→FIP conversion of solar plants
2026-07-21 LC-JAPAN Low-voltage grid battery partnership
2026-07-22 Green Road Energy Low-voltage grid battery partner
2026-07-27 Rising Corporation (listed) Low-voltage grid battery partner

Stated plans

From the Series A release (2026-04-02), funds are to be used for: (1) hiring, including executives, and building out sales, service delivery, and corporate functions; (2) product development toward automated battery operation and fully automated asset management; (3) expansion into acquiring, operating, and managing power plants directly, and eventually structuring energy asset funds.

For the low-voltage battery business, the stated aggregation target is 500 units by 2028 and 1,000 by 2030 (2026-07-27).

Founder

Nana Hori (堀 菜々) — co-founder, representative director; leads operations and customer relationships.

Vincent Filter — co-founder, representative director; leads product and technology (company page, LinkedIn).

  • Former strategy consultant covering the power sector.
  • Prior experience in SaaS development and commercialization; UX design background.

Other leadership listed on the company page

Name Role Stated background
Akira Shirota COO 30+ years in power and energy
Sebastian Watzke Head of Product ex-Google, ex-Rakuten
Riccardo Iacobucci Principal Energy & Data Scientist PhD, Kyoto University
Miguel Acevedo Infrastructure & IoT 20 years in cloud and software
Macky Tanaka Head of Design —

The same page also lists frontend, backend, business development, and data science team members.

Funding

Date Round Amount Investors Cumulative Source
2022-03-08 Seed ¥70M Genesia Ventures ¥70M PR TIMES
2024-03-27 Pre-Series A ¥450M Genesia Ventures and others — PR TIMES, Genesia (EN)
2025-03-04 Pre-Series A extension ¥100M Globis Capital Partners ~¥700M PR TIMES
2026-04-02 Series A ¥950M Global Brain (lead), Globis Capital Partners, Delight Ventures ¥1.7B PR TIMES, Kepple (JA)

Round labels above follow the company's own releases. Genesia Ventures described its March 2024 participation as its third investment in the company. The company page additionally lists Mizuho Capital, Fukuoka Financial Group, and Plug and Play as investors.

The March 2024 round was announced together with the launch of the battery charge/discharge optimization service (PR TIMES). The solar generation forecasting service went GA in June 2023.

Engineering

Technology stack and platforms

Inferred from job postings and public documentation:

Systems

System What it does Docs
Solar generation forecasting Per-plant ML models trained on that plant's history, validated against a physics simulation of the same plant and rejected if they don't beat it. Four weather providers, 14-day horizon. docs
Price forecasting Per-area JEPX day-ahead price models, plus a separate model per area for the probability of a zero-price event. 13 days ahead at 30-minute granularity; weekly retraining, daily inference. docs · balancing market
Battery optimization Mixed integer linear program deciding charge/discharge across JEPX day-ahead and EPRX primary adjustment (FCR), replanned at least every 30 minutes around the D-1 10:00 gate closure. docs
Battery / EMS integration MQTT over TLS on AWS IoT Core carrying telemetry up and dispatch commands down, with an X.509 certificate per site gateway, 1 Hz telemetry where FCR applies, and local buffering with backfill on reconnect. guide · specs
Simulation engine Financial and generation modelling over an asset's life — CAPEX/OPEX, scenarios, price forward curves, curtailment, FIP. docs
Platform API REST access to assets, forecasts, and actuals. docs

Public documentation is built with Docusaurus. A public status page tracks Tensor Cloud UI, Platform, User Authentication, Tensor API, and Documentation. Accessed 2026-07-29, its trailing three-month view showed 100% for UI, auth, and API and 99.988% for the platform, with a 15-minute platform outage on 2026-07-28.

Technical background sought

The backend role requires production Go experience. Preferred rather than required backgrounds include GraphQL, Kubernetes, DevOps or platform engineering, information security, AWS CDK and agile development (posting). These are hiring signals; the documented product itself confirms AWS CDK and IoT infrastructure, but does not establish production use of GraphQL or Kubernetes.

Industry domain

The Japanese electricity market. What an engineer would have to pick up:

  • Market mechanics — JEPX day-ahead in half-hourly slots with a D-1 10:00 gate closure, EPRX primary adjustment (FCR), the balancing market, balancing groups, plan submission to the TSO, imbalance responsibility (docs)
  • Subsidy and contract schemes — FIT, the FIP premium, post-FIT operation, onsite and offsite PPAs (docs)
  • Grid operations — output curtailment and its signals, low- versus high-voltage connection, AC-linked / DC-linked / grid-only battery sites (docs)
  • Physics and asset finance — irradiance and plant modelling, battery state of energy and cycle cost, 30-year project cash flow with SPVs (docs)
  • Regulatory change on its own schedule — the April 2026 reform opened the balancing market to low-voltage resources, and an Electricity Business Act amendment passed cabinet in March 2026 (2026-04-02)

On acquiring it: postings list "basic understanding of the energy industry and willingness to learn" as preferred, not required. The company states that all team members, engineering included, are expected to understand industry structure, energy physics, energy economics and regulation, and are taken into the field (TokyoDev).

Working conditions

The TokyoDev company profile, role page and company careers page are undated, continuously updated sources; all were accessed on 2026-07-29.

Item Detail Source
Language English is the internal common language; Spanish, Japanese, German, French also spoken. Engineering postings require business English, no Japanese TokyoDev, posting
Location Hiring prioritizes Fukuoka city, relocation encouraged but not required; Fukuoka-based staff asked to come in at least 2 days/week TokyoDev
Remote Must be in an Asia time zone, 4–5 hours daily overlap; company operates across CET and JST TokyoDev
Visa Japanese visa sponsored after at least 3 months of remote work TokyoDev
Benefits Fully remote work, Fukuoka office as collaborative space, flexible hours, informal dress code, visa support, equity compensation, health insurance and pension for employees in Japan careers page
Turnover Two people left in the preceding two and a half years TokyoDev
Domain expectation All team members, engineering included, are expected to understand industry structure, energy physics, energy economics, and regulation; team members are taken into the field TokyoDev

Notes

Not publicly disclosed

Search scope for the findings below (2026-07-29): the English and Japanese corporate sites, Tensor Cloud documentation and sitemap, legal and security pages, status page, company press releases, current careers pages and TokyoDev listings; searches for Tensor Energy and Tensor Cloud in English and Japanese; GitHub organisation/name/domain searches; conference and technical-talk searches; investor portfolios and funding databases.

  • No engineering blog, conference talks, or public open-source repositories were found.
  • Salary ranges are not published in the job postings reviewed (TokyoDev posting states "No salary range given").
  • The published information security policy (January 2024) does not name any third-party certification such as ISO 27001 or SOC 2.
  • The rounds in which Mizuho Capital, Fukuoka Financial Group, and Plug and Play invested are not stated publicly.

Inconsistencies across sources

Other

Resources

Official

Press releases (PR TIMES, JA)

Third-party coverage and profiles