JEPX Spot Market to Adopt New Rules from April 2026! BESS NEWS Explains Changes in Trading Practices.
BESS NEWS has released an analytical article outlining practical verification points regarding the new system and trading rule changes for the JEPX spot market, to be introduced from April 2026. It covers crucial changes affecting electricity trading operators, such as the introduction of market orders and revised bid acceptance times.
📋 Article Processing Timeline
- 📰 Published: April 28, 2026 at 20:00
- 🔍 Collected: April 28, 2026 at 11:31
- 🤖 AI Analyzed: April 28, 2026 at 11:42 (10 min after Collected)
BESS NEWS, a specialized news site that freely publishes important information related to grid-scale batteries, has released an explanatory article titled "Electricity and Gas Market Surveillance Commission Has No Objections to JEPX Regulation Changes - How Will Trading Rules Change with the New Spot Market System in April 2026?" This article organizes practical verification points regarding the new system and trading rule changes for the JEPX spot market, which will be introduced from April 2026.
On March 23, 2026, the Electricity and Gas Market Surveillance Commission announced that it had informed the Minister of Economy, Trade and Industry that it had "no objection" to the changes in the operational rules of the Japan Electric Power Exchange (JEPX). The changes include the introduction of a new spot market system, independent placement of the market surveillance office, termination of transitional measures for indirect auctions, and the addition of annual products for indirect transmission rights. This time, BESS NEWS specifically focused on the changes in trading practices accompanying the introduction of the new spot market system. These changes, which could affect the operations of electricity trading operators, include the introduction of market orders, changes in bid acceptance times, specification of plan codes for each bid, review of block bid processing, and simplification of contract notifications. BESS NEWS clarifies that these changes are not merely "regulation revisions" but practical issues that bidding, electricity trading, and information system personnel should all confirm.
### Themes Explained by BESS NEWS This Time
- 1-1. Electricity and Gas Market Surveillance Commission responds with "no objection" to JEPX regulation changes
- 1-2. Introduction of the new spot market system in April 2026
### 5 Key Changes to Note in the Spot Market
- 2-1. Market orders become available
- 2-2. Bid acceptance times are extended
- 2-3. Plan codes can be specified per bid
- 2-4. Block bid processing is reviewed
- 2-5. Contract notifications are simplified
### Practical Precautions Often Overlooked
- 3-1. Even if bidding is possible "all day," deadlines remain
- 3-2. Not only trading rules but also internal system compatibility is required
#### 1. Themes Explained by BESS NEWS This Time
This BESS NEWS article organizes what will change with the new spot market system from April 2026, in response to the Electricity and Gas Market Surveillance Commission's "no objection" to the JEPX operational rule changes. The spot market is a market for buying and selling electricity to be delivered the next day. Under JEPX operational rules, next-day trading is conducted using a single-price auction method, targeting electricity in 30-minute increments, where buying and selling are matched collectively after the deadline.
However, the purpose of this article is not solely to explain the market system. BESS NEWS focuses its explanation on "how to place bids," "deadline management," and "incorporation into internal systems," which are often overlooked in actual electricity trading.
#### 2. 5 Key Changes to Note in the Spot Market
With the introduction of this new system, several trading rules in the spot market will change.
Of particular note is the introduction of market orders. According to JEPX documents, the new system will allow for the designation of market orders, where sell bids are treated as the lowest sell bid and buy bids as the highest buy bid. In addition, bid acceptance times will change significantly. Under JEPX's revised trading rules, the bid acceptance time for next-day trading is from 0:00 AM eleven days before the delivery day until 10:00 AM on the day before the delivery day.
Furthermore, the ability to specify a plan code for each bid is practically important. This makes it easier to associate bids with specific contracts, even within the same area. In the main BESS NEWS article, other points that trading personnel should confirm include the review of block bid processing and the simplification of contract notifications.
#### 3. Practical Precautions Often Overlooked
One common misunderstanding regarding these changes is the extension of bid acceptance times. Hearing "bidding possible all day" might suggest flexibility until the last minute of the previous day. However, under the revised trading rules, the deadline for next-day trading is 10:00 AM on the day before the delivery day. This means that even if acceptance times are extended, deadline management is still necessary.
Another precaution is internal system compatibility. JEPX explained in its interconnection system briefing that the new system will provide functions via server-to-server data communication using dedicated lines, and no screen interface will be provided. Therefore, these changes are not solely a matter for trading personnel. BESS NEWS delves into such practical verification points as how to link bid data, plan codes, and contract notifications to internal systems.
This article is recommended for electricity trading operators, retail electricity suppliers, power generation companies, aggregators, and personnel involved in revenue management for grid-scale batteries and renewable energy businesses who utilize the JEPX spot market.
On March 23, 2026, the Electricity and Gas Market Surveillance Commission announced that it had informed the Minister of Economy, Trade and Industry that it had "no objection" to the changes in the operational rules of the Japan Electric Power Exchange (JEPX). The changes include the introduction of a new spot market system, independent placement of the market surveillance office, termination of transitional measures for indirect auctions, and the addition of annual products for indirect transmission rights. This time, BESS NEWS specifically focused on the changes in trading practices accompanying the introduction of the new spot market system. These changes, which could affect the operations of electricity trading operators, include the introduction of market orders, changes in bid acceptance times, specification of plan codes for each bid, review of block bid processing, and simplification of contract notifications. BESS NEWS clarifies that these changes are not merely "regulation revisions" but practical issues that bidding, electricity trading, and information system personnel should all confirm.
### Themes Explained by BESS NEWS This Time
- 1-1. Electricity and Gas Market Surveillance Commission responds with "no objection" to JEPX regulation changes
- 1-2. Introduction of the new spot market system in April 2026
### 5 Key Changes to Note in the Spot Market
- 2-1. Market orders become available
- 2-2. Bid acceptance times are extended
- 2-3. Plan codes can be specified per bid
- 2-4. Block bid processing is reviewed
- 2-5. Contract notifications are simplified
### Practical Precautions Often Overlooked
- 3-1. Even if bidding is possible "all day," deadlines remain
- 3-2. Not only trading rules but also internal system compatibility is required
#### 1. Themes Explained by BESS NEWS This Time
This BESS NEWS article organizes what will change with the new spot market system from April 2026, in response to the Electricity and Gas Market Surveillance Commission's "no objection" to the JEPX operational rule changes. The spot market is a market for buying and selling electricity to be delivered the next day. Under JEPX operational rules, next-day trading is conducted using a single-price auction method, targeting electricity in 30-minute increments, where buying and selling are matched collectively after the deadline.
However, the purpose of this article is not solely to explain the market system. BESS NEWS focuses its explanation on "how to place bids," "deadline management," and "incorporation into internal systems," which are often overlooked in actual electricity trading.
#### 2. 5 Key Changes to Note in the Spot Market
With the introduction of this new system, several trading rules in the spot market will change.
Of particular note is the introduction of market orders. According to JEPX documents, the new system will allow for the designation of market orders, where sell bids are treated as the lowest sell bid and buy bids as the highest buy bid. In addition, bid acceptance times will change significantly. Under JEPX's revised trading rules, the bid acceptance time for next-day trading is from 0:00 AM eleven days before the delivery day until 10:00 AM on the day before the delivery day.
Furthermore, the ability to specify a plan code for each bid is practically important. This makes it easier to associate bids with specific contracts, even within the same area. In the main BESS NEWS article, other points that trading personnel should confirm include the review of block bid processing and the simplification of contract notifications.
#### 3. Practical Precautions Often Overlooked
One common misunderstanding regarding these changes is the extension of bid acceptance times. Hearing "bidding possible all day" might suggest flexibility until the last minute of the previous day. However, under the revised trading rules, the deadline for next-day trading is 10:00 AM on the day before the delivery day. This means that even if acceptance times are extended, deadline management is still necessary.
Another precaution is internal system compatibility. JEPX explained in its interconnection system briefing that the new system will provide functions via server-to-server data communication using dedicated lines, and no screen interface will be provided. Therefore, these changes are not solely a matter for trading personnel. BESS NEWS delves into such practical verification points as how to link bid data, plan codes, and contract notifications to internal systems.
This article is recommended for electricity trading operators, retail electricity suppliers, power generation companies, aggregators, and personnel involved in revenue management for grid-scale batteries and renewable energy businesses who utilize the JEPX spot market.