Introduction to trading

The trading section is where you submit and monitor bids placed on Japanese power markets from Tensor Cloud. The JEPX day-ahead (spot) market — both sell bids from battery discharge and buy bids for battery charging — is supported through our direct JEPX API integration.

Tensor Cloud also handles participation in the Primary capacity market (FCR, 一次オフライン) via EPRX for standalone and co-located battery projects, including low-voltage assets. A dedicated trading UI for this market is coming soon.

Support for the JEPX intraday market (時間前市場) is also coming soon.

Prerequisites

JEPX API integration requires a manual approval process with JEPX and is set up per workspace by the Tensor team. Before you can submit bids through Tensor Cloud, please contact us via the Get support button in the top navigation bar so we can complete the registration and verify the delivery contract code on file for your workspace.

How trading works

Bid volumes come directly from the Tensor optimization model for each delivery date — the platform builds the bid set automatically from your planned charge and discharge schedule, aggregates volumes per grid area, and sends the bids to JEPX via API. You can also enter or adjust bids manually before submission if you want to override the model's output for any slot. Once the day-ahead auction clears, Tensor Cloud retrieves the confirmed volumes and clearing prices and updates the trading screen so you can see the outcome per slot.

See the JEPX spot trading page for details on the screen, statuses, the submission workflow, and the change history.