Data · API / Electricity tariff & subsidy APIs · Kokusai Kogyo
Build comparison and search services with maintained Japanese electricity tariff and smart-energy subsidy data. Select the supported plans, fields and update terms your application needs.
Published service coverage spans electricity plans from 100+ suppliers. Compare supported basic and usage charges, time-of-use rates, fuel adjustments and Japan’s renewable energy surcharge.
Electricity tariff data & APIs →ASP combines irradiance data for 835 locations with a battery product master. Manufacturer-supplied characteristics help reflect usable capacity, charging power, conversion losses and standby consumption.
How residential simulations work →Find smart-energy support programs from national, prefectural and municipal authorities. Search by region and equipment to identify candidates for solar, storage, EV and V2H projects.
Japan smart-energy subsidy database →Updated data matters after launch. The Japanese Biz service publishes a monthly electricity-tariff update cycle; the subsidy API publishes monthly updates. Equipment-master and other dataset updates follow their own release processes. Confirm the dataset, effective dates, delivery method and update terms for your selected service.
Published coverage checked October 3, 2026. Counts vary with updates and do not imply that every plan, product or subsidy is available through every API. Sources: ASP capabilities, Biz tariff updates and subsidy API coverage (Japanese).
Global energy platforms; manufacturers; retailers; installers; software developers.
Identify your target regions and equipment first. Test field coverage, update timing and the rules needed between a search result and a customer recommendation.
Database coverage and update cycles differ by dataset. Verify current tariff eligibility and subsidy rules against the issuing authority; data access does not guarantee eligibility or funding.
Tell us your customer segment, local operating model and first use case. We will discuss product fit and any additional data, integration, training or specialist work required.
This page is an English introduction. Confirm interface, documentation, report and support languages for the product or engagement. Bilingual outputs and localization should be specified explicitly.
Request a quotation for the product, users or usage, data rights, scope and support you need. Confirm implementation fees, recurring fees, contract term and any project work before ordering.
Tell us what you want to launch in Japan, who will use it, and where the work is getting stuck. We can discuss the right combination of software, APIs, data and specialist support.