Since Japan opened its electricity market to competition in 2016 and its city gas (都市ガス, toshi gas) market in 2017, dozens of companies have started selling both fuels together as a single package. These are usually marketed as a セット割 (setto-wari), or "set discount," and the pitch is simple: put your electricity and gas on one account, get one bill, and pay a little less than you would for two separate contracts. For foreign residents already juggling utility paperwork in a second language, the idea of one bill and one support line is appealing. But whether it actually saves you money depends on the details.
Who sells electricity + gas sets
Three main types of companies offer these bundles:
- Regional electric utilities (the former monopoly power companies, such as TEPCO, Kansai Electric, or Chubu Electric) now also sell city gas in areas where they've entered that market, and bundle it with their own electricity plans.
- Regional city gas companies (such as Tokyo Gas or Osaka Gas) sell electricity plans alongside their traditional gas service, again bundled under one contract.
- New entrant retailers (shin-denryoku, 新電力) that don't own any infrastructure themselves but resell both electricity and gas, sometimes with added perks like points programs or mobile phone bundles.
In all three cases, the gas itself still flows through the same regional pipeline network, and the electricity still comes over the same regional grid. Switching providers changes who bills you and what you pay, not the physical supply.
How the discount typically works
Set discounts are usually structured in one of two simple ways: a small percentage taken off your electricity or gas usage charges, or a flat monthly discount (for example, a fixed yen amount off your total bill) once both services are registered under the same account. The discount is generally modest rather than dramatic — think "a few percent off," not a deep cut. Some providers apply the discount only to the electricity portion, others split it across both, and some tie it to a minimum usage tier. Because the details vary a lot between companies, it's worth reading the actual rate sheet rather than assuming a "set" automatically means a big saving.
The catch: city gas vs. propane
This is the detail that trips up the most people, foreign residents included: set discounts almost always require city gas (都市ガス). If your building runs on propane or LPG (プロパンガス, puropan gas), these bundles typically do not apply to you at all.
Propane is a separate market with its own pricing structure, often supplied by a local dealer rather than a regional gas company, and it tends to run more expensive per unit than city gas. Propane pricing is also less standardized and less regulated for transparency, which is part of why nationwide electricity retailers rarely bundle it into a set plan. If you live in a detached house, an older apartment, or in a more rural area, there's a good chance you're on propane even if you've never thought about it.
How to check which one you have
- Look at a past gas bill: it will state the provider name and usually the gas type. City gas bills come from a regional gas company (e.g., Tokyo Gas, Osaka Gas); propane bills come from a local LP gas dealer.
- Check your unit price. Propane is billed per cubic meter but at meaningfully higher rates than city gas, so a bill that looks expensive for modest usage is a hint.
- Look at the meter or tank. City gas connects via underground pipes with no visible tank; propane has a visible cylinder or tank on the property.
- Ask your landlord or real estate agent directly — this is a completely normal question when moving in, and one worth asking before you sign, since understanding your bill starts with knowing what you're actually being billed for.
Convenience vs. pure price
Even when the discount is small, some residents still prefer bundling for the convenience: one bill instead of two, one company to call if something goes wrong, and one login for online account management — which can matter if you're less confident navigating Japanese customer service by phone. That convenience has real value, especially in your first year or two in Japan. Just be honest with yourself about which you're optimizing for. If minimizing cost is the priority, run the numbers with our electricity cost calculator and compare against standalone gas pricing before committing. If reducing the number of accounts and bills you manage is the priority, a modest bundle discount can be a reasonable trade-off even if it isn't the cheapest option on paper.
Bundling isn't a trap, and it isn't a guaranteed win either — it's simply one more option to compare, the same as any other plan. For a step-by-step walkthrough of switching either service, see our guide on how to switch electricity providers in Japan, and if language support is a concern when contacting providers, check our list of English-friendly electricity companies. For answers to other common questions about utilities in Japan, visit our FAQ page.
Estimate your electricity cost →