Realizing stable supply through formulation of rules for using interconnection lines and monitoring and operation of national supply and demand situation and network
Monitoring the supply-demand situation and network operation 24 hours a day, 365 days a year
Interconnection lines connecting regions across the country have three functions: (i) stable supply (reducing power outage), (ii) economic efficiency (transmission of cheaper electricity), and (iii) environmental performance (utilization of renewable energy). OCCTO monitors nationwide transmission line operations and supply and demand situation on a real-time basis 24 hours a day, 365 days a year, and promptly and accurately provides supply instructions to general transmission and distribution companies in the event of power line accidents or supply-demand constraints so that interconnection lines can fulfill these functions.
Imbalance Between Supply and Demand Occurs…
As electricity cannot be stored in large quantities, supply and demand need to always match for a stable supply. When that balance is lost, the frequency is disrupted, and in the worst cases, this could lead to a major power outage.
Roll of Interconnection lines
Examples of Monitoring and Publishing
-
・Monitoring of the operation and work stoppage of major generators in the country
-
・Monitoring of the utilization of inter-regional interconnection lines connecting supply areas through market transactions
-
・Monitoring and publication of the operational status of the national cross-regional interconnection networks, including inter-regional interconnection lines
-
・Compilation and publication of annual to daily supply and demand conditions for each supply area
01 Supply-demand operation based on cross-regional reserve margin
As supply capacity and balancing capacity are utilized cross-regionally, it is important to grasp the supply and demand situation with a cross-regional reserve margin. OCCTO communicates supply and demand information with the cross-regional reserve margin updated every 30 minutes based on the latest demand forecast and power generation plan of the utility companies.
Publishing System for Cross-regional Reserve Margin
02 Electricity supply-demand monitoring
For the purpose of early detection of signs of supply-demand imbalance deterioration, OCCTO conducts monitoring from two points: kilowatts (kW) and kilowatt-hours (kWh) during times of tight power supply and demand and publishes the data.
03 Instructions to electric power company (EPCO) in case of tight supply-demand
In the event of deterioration in the supply and demand situation due to disasters or power supply problems, supply and demand stabilization can be promoted by interchanging power via interconnected lines across the country. OCCTO acts as a command post and check and coordinate information immediately. With the aim of maintaining a stable supply across the country, OCCTO provides instructions to EPCO who is a member of OCCTO, such as general power transmission and distribution company for transmitting and receiving power.
