Placing an EPC Order
Does Not Build a Plant —
The Gates Foreign Capital Clears Before
Investing in Japan's High-Voltage Grid-Scale Storage

Overseas money is beginning to circle Japan's high-voltage grid-scale battery storage (2MW/8MWh class). What draws it is the predictability of revenue. In most markets worldwide, storage economics are heavily exposed to price volatility; Japan, by contrast, has built several revenue streams into its institutions at once — the capacity market, the balancing market, and the JEPX wholesale market. The more fluent an investor is in batteries and cost structures, the more this readability pulls them toward Japan.

Yet when they actually move to acquire, the time sink is not equipment selection. The regulations on moving funds out of the home country, inward direct investment under FEFTA (the Foreign Exchange and Foreign Trade Act), chronically short grid capacity and land, the way equipment choices leave a residue on a future sale, and the tax tied to the acquisition structure — Japan's own institutions and procedures bear down far harder. This column follows them, in the sequence an overseas investor passes through on the way to acquisition, from primary sources.

At the front of a deal, one question comes up again and again: "If we place an order with a Japanese EPC, will the storage plant get built?" In the narrow sense of installing equipment, an EPC delivers reliably. But for a single battery plant to begin operating as a business, four conditions are needed beyond the hardware: the grid capacity to connect, the land to host that capacity, the regulation governing foreign capital entering Japan's electricity sector, and the route to move capital out of the home country. An EPC order fills only the equipment piece.

The first of these to bite is the route the money travels. If the source country imposes capital controls, the legitimate channel to inject home-country funds into a Japanese entity may simply not be open. Proceeding to property selection and price negotiation without designing this can dead-end at closing. This column is a map laying out, in order, the gates an acquisition must clear; it does not step into EPC selection or the mechanics of placing an order.

What follows walks through those gates in order. The sequence matters. If the first one — the route the money travels (①) — does not open, nothing downstream can move, however well it is worked out.

01 — A device with two faces, and the "high-voltage" vessel that holds it

A grid-scale storage plant is one device with two faces. In one instant it behaves as a consumer, drawing electricity from the grid; in the next it becomes a generator, pushing electricity back out. The first thing to confirm as an investment target is the "vessel" this device sits in — that is, the receiving-voltage class.

Japanese grid interconnection is divided by the voltage at which power is received. Output of 50kW or more but under 2,000kW received at 6.6kV is "high-voltage"; 2,000kW and above is "extra-high-voltage." Even when people say "2MW" loosely, staying within high-voltage requires holding output below 2,000kW (in practice around 1,990kW); land exactly at 2,000kW crosses into extra-high-voltage, where both the equipment and the procedures step up a level. Note that 8MWh means 8,000kWh, which is on the small side for grid-scale use.

High-voltage carries a second advantage: lighter regulatory procedure. Under the Electricity Business Act, the 2022 amendment positioned discharge from grid-scale storage of 10,000kW (10MW) and above as a "power generation business," but a standalone 2MW does not reach this and is not a generation-business notification. Construction-plan notification and pre-use self-inspection are likewise generally required at roughly 10MW of output or above, or 80,000kWh of capacity or above; a 2MW/8MWh plant stays on the lighter side of both. The chief electrical engineer can also be outsourced where output is under 5,000kW and under 7,000V.

Sources: Kansai Electric Power, "What is grid interconnection" (explanation of voltage classes) / Agency for Natural Resources and Energy (ANRE), "Q&A on the notification obligation for the power generation business," "Current status and issues of grid-scale storage batteries" (positioning discharge from grid-scale storage of 10,000kW+ as a generation business) / METI, materials on safety regulation of storage plants (confirmed June 2026).

02 — Three revenue sources, and the absence of a price guarantee

The revenue of a high-voltage storage plant is not complete in any single market. The basic approach turns over three markets in combination — the capacity market, the balancing market, and JEPX — each of which buys a different value.

What the capacity market trades is "kW" — supply capability. In the latest round (for FY2029, published 20 January 2026), clearing prices were high in tight supply-demand areas and reached a record level, but the swing from year to year is large, and recent rounds have landed in the low thousands of yen. The balancing market handles "ΔkW" — adjustment capability — and primary reserve has run chronically short. That said, the cap price for primary and secondary reserve ① was cut from JPY 19.51/ΔkW per 30 minutes to JPY 15 (applied to trades from March 2026), with a stated direction to step it down further to JPY 10 and JPY 7.21 absent improvement in competition. What you go after on JEPX is the price spread on "kWh." On sunny midday hours it sinks to JPY 0.01/kWh and by evening jumps above JPY 20. That spread is the source of merchant-operation revenue.

Sources: OCCTO, capacity market main auction results (target delivery year FY2029, published 20 January 2026) / Working Group on Market Design (cap price in the balancing market, 110th meeting, January 2026) / EPRX / JEPX spot-market data (confirmed June 2026). The primary-reserve shortfall and the JEPX spread include an interpretation based on public materials.

What overseas investors tend to expect is 20-year fixed income. Japan does have a Long-term Decarbonization Auction (LDA); winning it yields long-term fixed income. But the LDA minimum bid capacity for batteries is 10,000kW (10MW), and a high-voltage 2MW does not even reach the threshold to bid. It can participate in the capacity market main auction, but in past main auctions battery bids amounted to 0.05% of the total (FY2023, roughly 80MW), so a high-voltage storage plant's revenue is premised on price-unguaranteed merchant operation. The "assumed IRR" figures circulating online are calculations built on assumptions, not a benchmark in public information against which deals can be compared side by side. Take the headline numbers at face value and you get tripped up at the entrance.

Sources: OCCTO, "Long-term Decarbonization Auction: scheme details" (minimum bid capacity 10,000kW) / ANRE, "Current status and issues of grid-scale storage batteries" (battery bids in the FY2023 main auction roughly 80MW = 0.05%) (confirmed June 2026).

03 — Gate ① The route to move funds out of the home country (depends on the source)

From here on, we enter gates that bear only on foreign capital. Whether capital can leave the home country turns on that country's regime, and which gate bites first swaps depending on the type of source. The table below maps that correspondence.

If the gate out is open — from the U.S., the EU, Singapore, Hong Kong and the like — this passes through almost untouched, and the effective first gate becomes FEFTA next. What demands care is when the source is a country with capital controls. China, where the regime is best documented, makes the structure clear. The annual USD 50,000 foreign-exchange facilitation allowance granted to individuals is confined to current-account items such as travel, study, and medical care, and cannot be used for capital-account items such as outbound direct investment (SAFE, the State Administration of Foreign Exchange). NDRC Order No. 11, which governs outbound direct investment (ODI), defines the investing party as an "enterprise" and states expressly that it does not apply to direct outbound investment by domestic natural persons. The Circular 37 registration that lets individuals use an offshore SPV is likewise a framework premised on round-trip investment back into the country, and does not contemplate an individual SPC whose sole purpose is acquiring overseas assets. This structure — where an individual's direct outbound investment is not, as a matter of the regime, open — is not unique to any one country; it is broadly common to countries that maintain capital controls. If the source falls into this type, the work begins not with choosing a property but with locking down the route the money travels.

Which route is available differs by investor and by source. Reading public information alone does not settle it; the work is to take the source country's rules one case at a time and build the structure up. Advance to property selection without clearing this gate and the conversation, even once agreed, stops at final closing.

04 — Gate ② Inward direct investment under FEFTA (designated sector, but likely non-core)

Once the funding route stands up, Japan's own FEFTA (inward direct investment) waits next. This bears on every foreign investor regardless of the source country. A grid-scale storage plant falls under the "designated sectors" and is likely subject to prior notification. By scale, however, it is likely not to fall under the "core sectors," and even within the same prior-notification regime, whether it is core or not changes how the exemptions are used and how heavy the screening runs.

First, whether it is a designated sector. The electricity business is listed among the "designated sectors" requiring prior notification from a national-security standpoint. The word "storage" does not appear in the notice text, but METI's classification of sectors under its jurisdiction includes within the "power generation business" any establishment that generates or discharges using electrical facilities it itself maintains and operates (for generation or for storage), setting no output threshold. Even without an explicit statutory mention, it is picked up as a generation business in practice. If the designated sector applies, an acquisition by a foreign investor becomes subject to prior notification (FEFTA Article 27), with thresholds of 1% or more of the voting rights for listed shares and from a single share for an acquisition of unlisted shares. Screening runs 30 days as a rule, extendable up to five months where there is a national-security issue, so in practice the delivery and balance settlement (closing) must be placed behind FEFTA clearance.

Next, whether it is a core sector. The notice defining core sectors limits the electricity business to "general electricity transmission and distribution operators, transmission operators, and power generation operators (limited to those holding a plant with a maximum output of 50,000kW or more)." A standalone 2MW-class asset is nowhere near this 50MW, so it is likely organized as "a designated sector but not core." Whether something is core matters for the exemption regime: for core sectors the use of the prior-notification exemption is restricted, and the core-sector prior-notification exemption does not apply to investment in unlisted companies. If it is not core, the additional restrictions do not reach it, but the absence of an exemption for the unlisted-acquisition form is worth keeping in mind when designing the vehicle.

The holding vehicle also changes the treatment. Whether you hold through a Japanese corporation (kabushiki kaisha) you operate yourself, or invest passively through a silent partnership (TK-GK structure), the weight of the notification diverges. A silent partner cannot, under the Commercial Code, conduct or represent the operator's business (Commercial Code Article 536), so on its face it is treated as passive investment. Still, "a TK-GK never requires notification" is wrong: the treatment can shift with the degree of involvement in management and with the direction of the regime. Whether you hold via a corporation or position yourself through a TK-GK — this choice governs how heavy or light the FEFTA entrance is.

Sources: Ministry of Finance, "Notice designating the designated sectors / Notice designating the core sectors," Appended Table No. 17 (mid-classification 33, electricity business) / METI, "On the inward direct investment screening regime," "FAQ on sectors under jurisdiction" (generation/discharge using self-maintained and self-operated electrical facilities falling under the generation business) / Bank of Japan, "FEFTA Q&A (inward direct investment and specified acquisition edition)" / Commercial Code Articles 535 and 536 (confirmed June 2026).

05 — Gate ③ What is scarce is grid capacity and land

When you set out to stand up a storage plant in Japan, the hardest thing to obtain is neither the equipment nor the construction capability. It is the capacity to connect to the grid and the land to host it.

As of the end of September 2025, grid-scale storage connection applications reached roughly 24GW, up about 3.9 times year on year (over the same period, solar rose about 1.1 times). Growth continued thereafter, and by the end of December 2025 applications had swelled to roughly 30GW and connection-study intake to roughly 172GW. Meanwhile the capacity actually energized stood at only about 640MW at the same end of December. Demand is plainly concentrated on the grid-capacity side.

In response to this congestion, from 1 April 2026 the deposit at the time of a connection-contract application doubled from 5% to 10% of the estimated construction-cost contribution, and installment payment of the construction-cost contribution was tightened to 50% or more on the first payment (an interim measure limited to grid-scale storage). Alongside this, from January 2026 onward, documents confirming registry records became mandatory in both the connection-study and connection-application processes, and documents evidencing the right to use the land became mandatory at the connection-application stage. Holding capacity on a slot alone, with no land backing, is no longer possible. These are interim measures until the full overhaul of the connection rules firms up, but the bar for acquiring new capacity keeps rising.

So even if an overseas investor tells a Japanese EPC to "build us a storage plant," the EPC does not have grid capacity to sell. The slots are held by operators who already secured them. Move without seeing the scarcity of capacity and you stumble here.

Sources: ANRE, Next-generation Power Grid WG, Material 1-1 (7th meeting, 9 February 2026: connection applications ~24GW, ~3.9× year on year) / 9th WG (as of end of December 2025: connection applications ~30GW, connection studies ~172GW, energized ~640MW) / 6th WG (24 December 2025), "On strengthening the discipline of grid-access procedures" / OCCTO, revision of the deposit calculation method (confirmed June 2026). The energized and connection-study-intake figures vary by quarter and by source.

06 — Gate ④ Rights sale versus completed asset

"Buying a storage plant" carries two meanings. A "rights sale," in which you take over a bundle of development-stage rights — grid capacity, land, the connection-contract application — and a "completed asset," in which you take over an operating asset with fixed specifications. The two differ greatly in the thickness of due diligence and the weight of representations and warranties. The first thing a foreign buyer should pin down is whether what they are about to take hold of is a bundle of rights or a settled asset.

What deserves particular care in a completed-asset deal is the treatment under the Construction Business Act. Article 24 of that Act provides that a contract concluded for consideration with the aim of completing construction work is deemed a construction-work contract, regardless of its title. Even labeled a "sale," if the substance is assessed as aimed at completing the work, it can be deemed a contract for work. The more the structure relies on deposits, progress-linked interim payments, and a final balance at handover, and the stronger the buyer's direction and supervision, the more the contract takes on the character of a work contract. Conversely, if the seller completes the asset on its own account and transfers a finished asset, it can be organized as a sale. If a seller without a construction-business license repeatedly does completed-asset deals with strong, bespoke, EPC-like elements, the risk of recharacterization into a work contract rises. ⚠️

At handover, the position under the interconnection contract is succeeded (a name change with the consent of the general transmission and distribution operator), and the necessary notifications are carried over. Whether repeatedly reselling land or leaseholds amounts to a real-estate brokerage business is, as a rule, exempt where one leases on one's own account, but repeated transfers remain a point requiring separate consideration. ❓

Sources: Construction Business Act Articles 24, 3, 22 (e-Gov) / MLIT, "Contracts for construction work and their discipline" / Electricity Business Act Article 27-29 (succession of position) / Real Estate Brokerage Act Article 2 (confirmed June 2026). Details on transaction objects, grid capacity, and contract structure: COLUMN 09, 19, 21.

07 — Gate ⑤ How equipment marks the exit (JC-STAR and the U.S. lists)

Equipment selection is not decided on price, lead time, and specs alone. Two axes bite when you eventually sell this asset — that is, at the exit. One is JC-STAR, Japan's cybersecurity certification; the other is U.S. procurement and export controls. They are two regimes on different rails, and both are worth reading at the acquisition entrance.

One is JC-STAR. It is an IoT-security conformity scheme run by METI and IPA, in which Star 1 and Star 2 rest on a self-conformity declaration and Star 3 and Star 4 on third-party evaluation, with IPA publishing a list of conforming products. At the Grid Code Study Group (20th meeting, December 2025), a policy direction was decided that the April 2027 revision of the grid-interconnection technical requirements would make the use of Star 1-certified equipment mandatory for extra-high-voltage and high-voltage solar and storage (low-voltage under 50kW from October 2027). What bites here is a project that newly interconnects (applies for the contract) after the technical requirements are revised — not equipment already in operation, and not the timing of when operation starts. The dividing line is "when you apply." The scope covers control systems with communication functions (PCS, EMS, and the like) that use IP communication; the battery cells and packs themselves are not included. Note that this is at present at the policy-direction stage, and formal reflection into each general transmission and distribution operator's grid-interconnection technical requirements (promulgation and enforcement) is not complete as of this writing.

The other is the U.S. lists. The U.S. Department of Defense's 1260H list (Chinese military companies list) added CATL in January 2025, and the June 2026 update expanded the scope to 188 companies, ranging across battery-related firms such as BYD, CALB, and EVE Energy. This does not immediately prohibit use within Japan, but within the U.S. it leads to procurement restrictions. Direct contracting by the U.S. Department of Defense is barred from the end of June 2026, indirect procurement through third parties from 2027, and battery procurement from six specified companies (CATL, BYD, and others) is individually barred from October 2027. This list further interlocks with U.S. export controls (the Entity List of the U.S. Department of Commerce's BIS; HUAWEI has been listed since 2019) and with CFIUS screening. When you later sell to an institutional investor, a leasing company, or a financier in Japan, such constraints echo into the procurement policy and the financing bankability. It is worth grasping at the entrance that Japan's cybersecurity certification (JC-STAR) and the U.S. procurement and export lists (1260H, Entity List) are different axes.

Sources: Grid Code Study Group material, "On requiring cybersecurity measures for distributed power sources" (20th meeting, December 2025) / IPA JC-STAR list of conforming products / U.S. DoD Section 1260H list (CATL: January 2025; June 2026 update brings the total to 188 companies, adding BYD, CALB, EVE Energy, and others. DoD direct-contracting ban end of June 2026, indirect 2027, battery procurement from six specified companies October 2027 = FY2024 NDAA §154) / U.S. Commerce BIS Entity List (HUAWEI: since 2019) (confirmed June 2026). Details of the JC-STAR scheme: COLUMN 14.

08 — Gate ⑥ Land and tax

Depending on the site, the Important Land Survey Act comes into play. A radius of roughly 1,000m around important facilities such as defense-related installations, plus border islands and the like, is designated as a "watch zone," and the important parts of these are designated "special watch zones." When concluding a contract to transfer ownership or other rights in land or buildings of 200m² or more within a special watch zone, both seller and buyer must give prior notification to the Prime Minister before the contract (the notification form records the transferee's nationality and the like; Act Article 13 / Enforcement Order Article 4). If a storage plant's site overlaps here, the acquisition incurs a notification obligation. A lease falls outside the prior notification for an acquisition, but the survey and recommendation on usage status reach the user as well, so a lease is not necessarily unrelated.

Sources: Cabinet Office, "Important Land Survey Act" (special watch zone, area requirement 200m², Act Article 13 / Enforcement Order Article 4; fully enforced 20 September 2022) https://www.cao.go.jp/tochi-chosa/ (confirmed June 2026).

On tax, withholding on dividends is the issue. Against the domestic-law rates (20.42% / 15.315%), tax treaties reduce the limit rate on dividends, interest, and royalties (application requires notification — for instance, the Japan-China tax treaty sets a 10% limit rate on dividends). The limit rate differs by the treaty between the investor's country of residence and Japan, so it is worth confirming for each source. Easily overlooked at the exit is the capital-gains taxation when a non-resident transfers shares in a Japanese real-estate-related corporation; if the premise is to acquire a finished asset and eventually sell, this is a point to build in at the entrance. In addition, the effective taxation changes with how repatriation is structured (dividend, tolling fee, or interest) and with whether a permanent establishment (PE) is recognized. Give a non-resident investor excessive participation rights and the PE-recognition risk rises.

Note that the FY2026 "bold investment-promotion tax measure" (immediate depreciation) has a scale wall. The investment-amount requirement is, as a rule, JPY 3.5 billion or more (JPY 500 million or more for SMEs and the like), with an average annual investment return rate and confirmation by the METI Minister also expected to be required; a standalone 2MW-class asset (on the order of several hundred million to a few billion yen) does not easily meet the requirements. ⚠️ Even if it could be used, immediate depreciation is a deferral of tax for accounting purposes, not a tax reduction; sell while the book value has dropped to near zero and a capital gain stands up in a lump at the time of sale. Furthermore, the requirement "excluding equipment provided for lending use" bites on the tolling type. And this measure is at the outline stage; promulgation and enforcement of the text are yet to come.

Sources: Cabinet Office (Important Land Survey Act) / Ministry of Finance, JETRO (tax treaties: Japan-China 10% dividend limit rate, etc.) / National Tax Agency / FY2026 Tax Reform Outline (confirmed June 2026). Details of the tax measure: COLUMN 22.

09 — Operation and safety after acquisition

Acquire a storage plant and operation and safety come with it. Yet the range in which the law names who must carry it out is surprisingly limited. A storage plant is subject to the duty to maintain technical-standard conformity, the appointment of a chief electrical engineer, and the notification of safety regulations (Electricity Business Act Article 43). Still, the chief engineer's statutory safety supervision centers on the receiving and transforming (AC) side, while the DC side — battery cells, BMS, PCS — and the communications side are not necessarily set out explicitly as within the range of statutory supervision. This is where a blank readily forms that the O&M contract should fill.

Even a wholly foreign-owned Japanese corporation can, as a matter of the regime, appoint a chief engineer or outsource it. No provision setting nationality as a requirement is found in the text. ❓ The practical wall is rather whether qualified personnel can be secured and whether the requirements for on-site stationing or outsourcing (the output and voltage caps) can be met. For a 2MW-class asset on high-voltage 6.6kV interconnection, the outsourcing option remains. On the operational side, the capacity market's penalty structure is also worth grasping. Where an outage plan is not submitted on a planned basis, a factor of 5 is applied to the missed slots, so an unplanned outage bites more heavily than a planned one. Build this asymmetry into the operating design.

Sources: Electricity Business Act Article 43 / METI, "Q&A on the chief engineer regime" / OCCTO, capacity-market requirement and penalty materials (5× for unplanned outages) (confirmed June 2026). Details of O&M: COLUMN 23.

10 — The full picture of the gates to clear

We return to the opening question to look back over the gates so far. "If we place an order with a Japanese EPC, will the storage plant get built?" The equipment itself can certainly be bought. Even so, a single plant does not stand up as a business, because a number of gates sit before and after the equipment.

The equipment can be bought. But capital does not move freely, regulation cannot be skirted, capacity cannot be obtained with money alone, and handover and exit can only be designed through contract. Only by teaming with a Japanese-side partner who can bind these together does a foreign-capital storage investment stand up. An EPC order is just one step within that whole.

Remaining uncertainties (points not yet settled)

This column, on a primary-source basis, distinguishes policy direction from promulgated text. The points not settled at present are listed separately. (i) Whether an SPC operating a grid-scale storage plant falls under "electricity business (power generation business)," and its connection to the core sectors (settled by inquiry to the competent ministry). ⚠️ (ii) The formal amendment and enforcement of the grid-interconnection technical requirements that accompany the JC-STAR mandate (at the policy stage at present). ⚠️ (iii) Whether immediate depreciation can be applied to a foreign-owned SPC (depends on scale and the lending requirement, and is at the outline stage). ⚠️ (iv) Whether a regime opening individual outbound direct investment in a capital-controlled country (e.g., QDII2) is enforced (it remains a proposal and is not yet in force). ❓ (v) Whether the own-brand products of the major overseas brands have obtained Star 1 (cannot be confirmed in IPA's public records). ❓ (vi) Whether a specific site falls under the Important Land Survey Act or the Real Estate Brokerage Act (depends on the site and the transaction form). ❓ Depending on how these turn out, the entrance design changes.

Ten items to confirm before an investment decision

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Conclusion — "Can buy" and "stands up" are not the same

For foreign capital, Japan's high-voltage storage plants hold the appeal of predictable revenue. Yet move directly and you find that what bites first — depending on the source — is neither revenue nor siting, but whether the funds can reach Japan at all. Beyond that lie FEFTA, judging what you are buying, grid capacity and land, the equipment's exit, and land and tax.

Every one of these, unless designed at the entrance, rebounds at final closing or at the exit. What this column has drawn is a map of those gates. How to get an individual deal through is the practical work that begins from here.

Japan's storage plants can be bought. But the investor who can make it real is the one who has designed each gate, one at a time, from the entrance on.

* This column is intended to organize the regulations and institutions, and distinguishes the stages of regulation (policy direction / deliberative approval / promulgation of text / enforcement). Points that cannot be confirmed (whether a storage plant falls under a core sector, applicability of the Real Estate Brokerage Act, any nationality requirement for the chief engineer, Star 1 obtained for overseas brands' own-brand products, and the like) are made explicit in the body. Passages referring to overseas regimes rest on the wording of each country's original text. This is not individual legal, tax, or investment advice. The content is as of June 2026.