PGIQ Rating v2 (reliability-adjusted) · as of June 2026

🇯🇵 Japan East (Tokyo, 50Hz)

Possible, but expect friction, holding steady Reliability flags found
Tier 4 Constrained · Composite 40/100, #73 of 79 markets (fundamentals 47 minus a reliability dock) · Outlook Stable · Med confidence · how we score

Tokyo is a top-five global hub, but the 50Hz eastern grid (TEPCO) is the tighter, pricier half. It issued Japan's first-ever power shortage warnings in 2022 and cannot freely draw on the western surplus across the limited frequency link.

See live grid data →

One market,
four reads

BuildTier 4Siting rating SellGrade COfftake PlanHeavyLoad pressure MonitorWeakGrid strength

The same market, four decisions. Open any lens to see this market ranked against the rest.

Time to energize · file to power

~90 mo

File a large load today, powered ~2034. Typical range 63 to 117 months, modelled.

Application & capacity study 12mo · Grid connection study & offer 18mo · Substation & network reinforcement 42mo · Construction & energization 18mo

End-to-end wait for a large new load, from an unstated start to an unstated end. Earlier milestones (initial, phased, temporary or conditional energization) are reported separately. A typical case, not a firm quote. · Source: Shulman Advisory: TEPCO PG connection lead time · Compare markets →

The same market, read four ways

BuildSellPlanMonitor

Japan East (Tokyo, 50Hz) is a limited market to sell power into

Grade C (Limited)

Offtake score 50/100

Demand 66, build feasibility 22, combined into the score. For a seller: where buyers already pay, how tight supply is, and how feasible new build is here.

Price to beat

A 100 MW load on our standard case pays about $160/MWh delivered here. A competitive supply offer works against that level.

Connection

Connection difficulty Severe, typical wait 5-10 years.

Scheduled to change

By 2027: Frequency-converter capacity between the 50Hz east and 60Hz west rises toward 3 GW (Japan east-west converter capacity (Wikipedia)).

See it on the Offtake Grade →

Japan East (Tokyo, 50Hz): effectively full at system level, heavy demand pressure

Effectively full 0/100

System-level room, not local capacity

Local capacity: not assessed. We have found no operator publication of area or substation capacity for this market, so whether the bus serving a candidate site can take the load is an open question. Absence of a finding here is not evidence that capacity exists.

Two reads for a grid planner: how much room the system as a whole looks to have (Effectively full), and how hard demand is already pushing (Heavy). The first is a market-level estimate from connection ease, forward adequacy and reliability margin. It is not local deliverability. Capacity at a specific substation is not assessed for this market, and a market can look roomy while the bus you want has nothing available. Confirm local capacity with the utility before relying on it.

Demand growth

Fast load growth in our read, the pull on your system.

Future firm supply

Future firm supply: tight for a large new load.

Load Pipeline Reality → Where demand is hungry → Connection friction →

Grid Risk Annex BETA

Weak

Deep conditions or guarantees needed · grid strength 37/100

A cited, dated grid-risk read on Japan East (Tokyo, 50Hz) for a capital provider, the banks and private-credit lenders, infrastructure funds and insurers holding or underwriting a power or data-centre exposure here. Drop it into a credit memo and watch each factor over the life of the exposure.

Read it against your asset. For a load asset (Buy), weight connection access and energization timing. For a generation or offtake asset (Sell), weight offtake demand, curtailment (when a plant is told to stop feeding the grid) and cost realisation. For a grid or transmission asset (Move), weight load-pipeline reality and buildout risk.

Rating and track record

PGIQ Tier 4 Constrained, outlook Stable, Med confidence. Scored on a public, dated, falsifiable record you can cite in a credit memo.

Delivery reliability

Reliability flags found in the bulk and local outage record we reviewed.

Future firm supply

Future firm supply: tight.

Cost certainty

Recurring cost about $160/MWh (band $135 to $190) for the standard 100 MW case, basis modelled. Excludes connection capital.

Regulatory / stroke-of-pen

Not assessed.

Execution risk

Connection friction Severe, the risk the project or load actually energizes on time.

Ongoing monitor

Track this market's rating actions and the Global Power Index as a covenant-style monitor over the life of the exposure.

Monitoring plan

Covenant-style triggers to watch over the life of the exposure: a change in the PGIQ rating or outlook; a dated regulatory move (stroke-of-pen risk); a capacity-auction or cost-band shift; a forward firm-supply adequacy warning; and a rise in queue drop-out or connection friction. Track them on this market page and the Global Power Index, or as Analyst Desk alerts.

Sources: Tokyo first-ever power shortage warning 2022 (Nippon.com) · Japan east-west converter capacity (Wikipedia)

This is a directional grid-risk screen, not a credit rating, and not investment, engineering or procurement advice.

The formatted, cited Grid Risk Annex export is an Analyst Desk feature.See the Grid Exposure Monitor →

Sub-region rating. Part of the Japan national overview.

The five pillars behind the tier

The pillar signature: Access, Availability, Cost, Momentum, Carbon, taller is stronger. The same shape repeats across every market so peers compare at a glance.

Access30%55

Constrained access on a tight island grid; Tokyo/Inzai is the eastern demand centre.

Availability25%48

Tighter availability: first-ever power shortage warnings in 2022 (cold, low solar, post-quake shutdowns), with the large Kashiwazaki-Kariwa restart still pending.

Cost25%22

Highest cost: eastern-area wholesale runs above the west given the tighter balance.

Momentum15%78

Highest momentum: Tokyo anchors the eastern data-center cluster.

Carbon5%30

Higher carbon: more LNG and coal, less nuclear online than the west.

Default weights, which lean toward cost and access rather than carbon: Access 30 · Availability 25 · Cost 25 · Momentum 15 · Carbon 5. Momentum reflects the data-center build already underway, not just stated intentions.

Seller view: Read these the other way: momentum is your customer pipeline, cost is your revenue ceiling, and access is how hard it is to build and sell here, not only to connect.

Reliability overlay

Reliability adjustment: the five-pillar score of 47 is reduced to 40, a deduction of 7 points, reflecting the delivery-reliability and firm-supply risks flagged below. Reliability is reported as five separate layers, never as one combined label, because they answer different questions and a strong answer on one does not cover a gap in another: what has actually failed on the bulk system, what a forward assessment expects of firm supply, how the local network performs, what your contract actually promises, and what your site is designed to ride through. Any one of them can cap the tier.

Historical bulk-system performance: No reliability flags found

Historical utility-territory delivery performance: No reliability flags found

Average customer interruption (SAIDI) of 24 minutes per year in FY2024, excluding major event days as filed.

measured · Japan OCCTO quality of supply

Role not yet declared. We have not recorded whether this is one operator’s filing or an average across several, so read it as context until we do. national average across Japan's regional utilities. It is a territory-wide history and is silent on: performance at a specific substation or feeder; transmission-level service, which is a different product from distribution service; the industrial or large-load customer class specifically; N-1 or other redundancy architecture at the supplying substation; contractual curtailment rights the utility may hold over the load; power quality and momentary interruptions, which this metric excludes by construction; on-site UPS, storage or generation; forward adequacy: it is a record of what happened, not a forecast.

Forward resource adequacy (assessed): Tight

The 50Hz east is structurally tight: it issued Japan's first-ever power shortage warnings in 2022, big eastern nuclear (Kashiwazaki-Kariwa) is still returning, and only about 1.2 GW of frequency converters (rising toward 3 GW by 2027) link it to the western surplus, so the east cannot freely borrow firm capacity from the west.

What this means: A large new load should expect genuine exposure to forced power cuts (curtailment), price spikes, and delays in getting connected, and should design in backup power or firm supply contracts.

event-based · Tokyo first-ever power shortage warning 2022 (Nippon.com) · Japan east-west converter capacity (Wikipedia)

Contractual service terms: not assessed

We have not compiled what firm service actually promises here: whether it is firm, non-firm or interruptible, the conditions under which you can be curtailed, the redundancy required of you, and the transfer time behind any N-1 commitment. Treat this as an open diligence item, not as an indication that service is firm.

Ask the utility for the tariff or service agreement terms before relying on firm supply.

Designed site resilience: not applicable at market level

Utility feeds, UPS, storage, on-site generation, islanding, black start and the residual energy you still expect to lose are properties of a specific site design, not of a market. This layer only exists once there is a site, and we never assert it for you.

Confidence: Med-High. Each input is labelled as measured, modelled, or drawn from a specific event, and is framed as a risk to a prospective large new load, not as a verdict on any utility or grid operator. Forward adequacy is an assessment of what is expected, not a measurement of what has happened; it is a forecast and is labelled as one.

Seller view: Tight forward capacity (firm supply promised for future years) is scarcity that firm generation and storage get paid for; an adequacy flag is a demand signal for new supply, not only a risk to a load.

Supply relief outlook

Will the power crunch ease before your load energizes? This nets the demand racing for capacity against the new supply likely to arrive and the old supply leaving. A cross-side read, using the same data a seller sees the other way.

Tightening

Demand pressure

Fast load growth competing for the same capacity.

Future firm supply

Future firm supply: tight.

What this means: The supply picture looks likely to tighten; a new load should lock firm supply early and expect competition for capacity.

Reliability metrics

Delivery reliability (measured)

The average customer loses about 24.0 minutes of power per year (FY2024). This is the standard regulator outage measure (SAIDI); lower means a more reliable grid.

Source: Japan OCCTO quality of supply

Hard, cited measures behind the reliability overlay above: the regulator outage series (SAIDI, measured, published with a lag) and the forward resource-adequacy assessment (a measured forecast). Framed as risk to a prospective large new load, not a verdict on any utility.

Connection friction

How hard it is to connect a large new load here, and how long it takes. Part of the PowerGridIQ Connection Friction Feed. Labelled measured; confidence Med-High.

Friction level

Severe

Typical connection wait

5-10 years

Source: Shulman Advisory: TEPCO PG connection lead time

This market's friction level, wait band and full story are free here. The precise typical wait in months, and every market ranked side by side, are the Analyst Desk.

Inner-Tokyo power connections run 5 to 10 years; the 66kV network and substation build are the bottleneck.

Power connections in inner Tokyo take about 5 to 10 years, and reports from Chiba cite a 10-year wait as the capacity limits of TEPCO's 66kV network plus substation and transmission construction exceed the building timeline. Transmission-connection applications reached about 15 GW at end-FY2025, up 20 percent year on year. TEPCO Power Grid has said it aims to halve data-centre connection lead times, the main forward watch item.

What builds the 90-month wait

Application & capacity study12 mo

Grid connection study & offer18 mo

Substation & network reinforcement42 mo

Construction & energization18 mo

Typical time to energization90 months

How the typical connection wait breaks down by stage. Stages overlap in practice and vary by project; the split is our estimate anchored to the operator process, and the total is the representative time to energization. Anchored to the operator process (Shulman Advisory: TEPCO PG connection lead time).

Data-center share of demand pressure: Very high. Sources: Introl: Japan data-center power crisis · Shulman Advisory: TEPCO PG halving connection lead time. The full cross-market connection dataset is available through the Connection Friction Feed.

Seller view: Connection difficulty is both your own time-to-revenue and a barrier limiting competing supply from reaching this market.

Realized cost band

What a large electricity user pays for power here on one declared case, 100 MW contracted demand, 95% load factor, HV service, per megawatt-hour. Not the wholesale price and not the sticker tariff: energy plus the grid, delivery and other charges that land on the bill. It is a range, because real contracts vary, and it is labelled by how it was built.

Recurring cost, delivered

$135 to $190 per MWh

Midpoint about $160 per MWh

How this band was built

modelled

From 2 public fragments

What builds the $160 midpoint

$112

$30

Generation (LNG-heavy)$112

Transmission & distribution$30

Fuel-cost adjustment & renewable levy$18

All-in delivered$160 /MWh

How the $160/MWh figure is built up, component by component, for 100 MW contracted demand, 95% load factor, HV service. The split is our estimate; the total is the midpoint of the compiled band (modelled). Recurring cost only: customer-funded connection capital is a separate one-off and is not included. Japan's power is among the most expensive in the OECD because it leans on imported LNG, and the monthly fuel-cost adjustment moves the bill. A large high-voltage data-centre contract sits below the small-business rate but well above US levels. Anchored to published figures (Japan business electricity price (GlobalPetrolPrices, Dec 2025)).

Where the cost lands

$160

Low $135Midpoint $160High $190

A band, not a single price: the cheaper end is a well-structured contract on favourable terms, the higher end a less optimised one. The midpoint is our best central read.

What is in the number: LNG-heavy generation plus transmission and distribution, the monthly fuel-cost adjustment and the renewable-energy levy. Japan has no US-style capacity market; cost is driven by imported fuel.

Tokyo is one of the world's largest data-center markets, but Japan's reliance on imported LNG makes delivered power among the most expensive in the coverage. A large high-voltage load negotiates a special contract below the roughly 28 yen per kWh small-business rate, but still well above US or Nordic levels, and the monthly fuel-cost adjustment adds volatility.

This market's band is free here; the ranked cross-market table with every market's precise midpoint is the Analyst Desk. See the ranked view.

Basis: triangulated from public sources, in US dollars per MWh delivered to a large high-load-factor load, excluding refundable taxes. Sources: Japan business electricity price (GlobalPetrolPrices) · TEPCO fuel cost adjustments (2026).

Seller view: This delivered price is the level a competitive supply offer must beat, and the revenue ceiling a merchant plant works against here.

Data provenance and freshness

What we hold for this market, field by field. Each tier below is assigned from the evidence actually held for that field, with provenance. A low tier means we looked and it is thin; it is not a verdict on the market.

cost: M1connection: M2reliability: M2carbon: M2regulatory: not_assessedlocal capacity: not_assessed

Against a Standardized Project Case, the binding field is cost, connection, reliability. That is what a standardized case would turn on here; a readiness result for your own project depends on your own requirements, siting and utility, which this market-level read does not know.

Read against other uses: Discovery and monitoring: M1 · Market comparison: M1 · Project Case with a carbon requirement: M1 · Conditional site diligence: insufficient.

Depth is not a rating strength, a confidence score or a feasibility conclusion. An aggregate is only ever shown for a named use case, and equals the lowest tier across that use case's required fields. Definitions v1.0. See the full coverage matrix.

How solid the data behind this rating is, on two separate axes plus recency. Source reliability is how measured the numbers are, as opposed to triangulated or modelled. Coverage is how many of the decision-relevant data dimensions (reliability, connection, and cost) are compiled for this market. The two are kept apart because they answer different questions: a market can have strong sources on the little that is covered, or broad coverage that still leans on models. Neither grades the rating itself. The rating is a cited opinion, graded separately and falsifiably by the public track record and baseline measurement plan.

Source reliability

Moderate

2 of 3 data layers measured

Coverage

Full

3 of 3 dimensions: reliability, connection, cost

Last reviewed

June 2026

per-layer vintages below

Layer	Method	Vintage	Freshness	Source
PGIQ Rating opinion	opinion	June 2026	Current	PGIQ methodology
Reliability	measured	FY2024	Fresh	Japan OCCTO quality of supply
Connection friction	measured	2025/26	Fresh	Introl: Japan data-center power crisis
Realized cost	modelled	2026	Fresh	Japan business electricity price (GlobalPetrolPrices)

Freshness reflects each layer's refresh cadence: reliability annual to three-yearly, capacity-auction and queue yearly, tariffs every year or two. The full cross-market freshness dashboard is at /data-quality.

What this market can and cannot answer yet

No market-level read closes a project case on its own, and saying only that would waste the evidence we do hold. Below is what is established, what is open, and what to do next.

What is established

Recurring cost band $135 to $190 per MWh, midpoint $160, basis modelled, against the 100 MW archetype
Historical utility-territory delivery performance 24.0 minutes per year (FY2024)
Forward resource adequacy (assessed)

What is open

Historical bulk-system performance
Contractual service terms (would change the answer)
Designed site resilience
regulatory evidence
local_capacity evidence

Who would actually serve you

Not compiled for this market. Identify the serving operator before relying on any figure here, because a market-level read is an average over territories.
Who runs the connection process: not yet compiled for this market. This is wayfinding rather than evidence, and its absence is a gap in our compilation, not a fact about the market.

Credible ranges today

Cost $135 to $190 per MWh, midpoint $160 (modelled)

What could disqualify this market

Structural isolation from the western surplus (about 1.2 GW of converters today).
Slow nuclear restart in the east.

Five questions for the utility or system operator

What is the available capacity at the bulk supply point and substation that would serve this site, and what would a 100 MW request do to it?
Is firm service available at 100 MW, and what curtailment rights would you retain over us once we are energised?
What are the milestone dates from a complete application to full firm energisation, and which network upgrades would a 100 MW load trigger?
What is the all-in delivered rate for 100 MW at a 95% load factor, including demand, network and rider charges, under the tariff that would actually apply?
What is your own territory's SAIDI and SAIFI for the industrial class, on which major-event standard, and what redundancy serves the candidate substation?

Documents that would advance the case

The area or substation capacity study, and the current queue position list.
The applicable large-load tariff or the draft electric service agreement.
The interconnection or system impact study, and a specimen connection offer.
The current tariff sheet with all riders, and any large-load contract terms.
The utility's own reliability filing and the substation single-line diagram.

Outlook drivers

↑ Upgrade triggers

Kashiwazaki-Kariwa and other restarts ease the eastern balance.
Frequency-converter capacity to the west rises toward 3 GW by 2027.

↓ Downgrade triggers

Restart delays keep the east tight.
Cold snaps or low solar trigger fresh shortage warnings.

Scheduled to change

Dated, already-announced events that will affect a large load sited here, in date order. These are published facts with sources, not our forecasts, and they matter most when your energization date is years out.

By 2027

Frequency-converter capacity between the 50Hz east and 60Hz west rises toward 3 GW

Lets the tight eastern grid draw more on the western surplus, easing the Tokyo-area balance.

Japan east-west converter capacity (Wikipedia)

Key risks

Structural isolation from the western surplus (about 1.2 GW of converters today).
Slow nuclear restart in the east.

Peer comparison

Trades like

constrained pricey hubs

Ahead of

western Japan on revealed build

Behind

western Japan on availability and carbon

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Rating history

June 2026

New ratingNew rating: Tier 4 Constrained assigned (eastern 50Hz grid).

🔒 The full time series behind Japan East (Tokyo, 50Hz), how its score, recurring cost, and interconnection queue (the line to connect to the grid) have moved month by month, is part of the Analyst Desk. The rating actions above are always free.

Every rating action is dated and explained, and the log is only ever added to, never edited. Reviews happen on a regular schedule and whenever a significant event occurs. "Affirmed" means we reviewed a development and the tier held; "Under review" means a significant item is being assessed and the rating could change.

Score history

How Japan East (Tokyo, 50Hz)'s reliability-adjusted score and tier have moved, month by month. Part of your Analyst Desk.

Loading history…

How does Japan East (Tokyo, 50Hz) compare to the other 78 markets?

This page is our full read on Japan East (Tokyo, 50Hz) alone, and it is free. To decide where a large load should actually go, you need every market side by side, ranked on recurring cost and time-to-connect, with the history and alerts when your shortlist moves. That is the Analyst Desk.

With your Analyst Desk, compare Japan East (Tokyo, 50Hz) against every market side by side, ranked on recurring cost and time-to-connect, with the full history and shortlist alerts.

+ Add to your shortlist Recurring cost, ranked Connection friction, ranked Get the Analyst Desk →

Cite as: PowerGridIQ Rating, "Japan East (Tokyo, 50Hz)" (Tier 4 Constrained), as of June 2026. A proprietary, directional screen for siting a large electricity load; not a connection guarantee, and not investment, engineering or procurement advice. Sources and methodology at powergridiq.com/methodology. © PowerGridIQ.