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Planning & procedure (3)

These are summaries of planning, procedure, and decisions that can be confirmed in public records. They are not legal determinations and do not determine illegality or impropriety of any facility, operator, or other party.

Unknown dates, outcomes, actors, and source counts are shown as unknown; they are not treated as zero.

Published extra-high-voltage standard durations (TEPCO Power Grid reference)

TEPCO Power Grid publishes case-specific standard estimates from application to energization for construction at 66 kV and above. These are not the wait time or energization date of an individual project.

Published caseApplication to energizationScope
New/rebuilt overhead line towers, fewer than threeAbout 42 months66–154 kV, two circuits, about 0.7 km
Case including a new substation and transformer additionAbout 120 monthsStandard duration for a new 154 kV substation

The estimates exclude constraints such as existing equipment, roads, rivers, buried infrastructure, permits and land acquisition, and do not guarantee supply within that period. Proximity to a transmission line does not establish that supply is available; preliminary consultation and a formal application are required. These TEPCO PG figures are not reused for Kansai or another supply area.

Sources: TEPCO Power Grid, standard durations for extra-high-voltage construction (May 2026). METI's large-demand survey received 190 responses from 264 data-center applicants in process in the Tokyo, Kansai and Kyushu areas; it is aggregate context, not a project schedule.

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