Most people just call the regional utility, pay the default rate, and never look again. That inertia quietly costs money for years. Mio doesn't care about which brand is famous — here's the math.
Japan deregulated electricity in 2016 and gas in 2017. That means the old regional monopoly (TEPCO, Kansai Electric, Tokyo Gas, Osaka Gas, etc.) is now just one option. Dozens of new retailers resell the same grid power and pipeline gas — the electricity and gas quality is identical, only the plan and price change. Many offer an electricity + gas "set" plan that shaves a few percent off, plus loyalty points (many bill in yen-equivalent points you actually use).
For a normal rental you generally do not pay a deposit for electricity or gas. Apply online (or by phone) roughly a week before move-in. You'll typically need your new address, move-in (start) date, and a payment method (card or bank). A hanko is usually not required for utility signup. One nuance: city gas often needs someone home for a short safety open-valve visit on the start day — book that slot in advance.
Already living somewhere on the default rate? You can switch retailers without moving and usually without any construction — the switch is handled on paper/online and your meter stays the same.
The cheapest-looking plans are sometimes market-linked (shijō rendō): the unit price tracks the wholesale electricity market, so it's cheap when the market is calm and spikes when it isn't. Great for gamblers, bad for budgeting. Also check for minimum contract periods or early-cancellation fees — some cheap plans lock you in, which matters if you'll leave Japan or move again soon.
If you value predictability: pick a standard (fixed unit-rate) set plan from a reputable retailer, skip market-linked plans, and confirm there's no cancellation fee before signing.
| Scenario (1-person apartment) | Rough annual cost |
|---|---|
| Default regional utility, electricity + gas separate | ¥120,000 |
| Reputable retailer, electricity + gas set plan (≈4% off + points) | ≈ ¥114,000 — saves ~¥6,000/yr |
| Market-linked "cheapest" plan, calm year | ≈ ¥110,000 (but can spike in a bad month) |
The saving from a solid set plan is modest but free and permanent — it repeats every year for no effort after setup. The market-linked plan can beat it in a good year and lose badly in a bad one. Mio weights predictable savings over lottery savings.
Don't default to the regional utility out of inertia. Pick an electricity + gas set plan from a reputable retailer, avoid market-linked plans if you want a predictable bill, and check for cancellation fees — especially if your stay is short. Setup is a 10-minute online form with no deposit; the payoff repeats every year.
Mio