Planning criteria

We employ various system planning criteria to ensure that we develop a reliable and robust transmission system. Our aim with these criteria is to support effective competition in energy markets, to reliably deliver power to systems connected to our system and customers dependent on our system, to provide support to distribution systems interconnected to our system and to deliver energy from existing and new generation facilities connected to our system.

These criteria may be revised from time to time. Situations that could precipitate such a change could include, but are not limited to new system conditions, new technologies, new operating procedures, extraordinary events, safety issues, operational issues, maintenance issues, customer requests, regulatory requirements and reliability council or NERC requirements.

The planning criteria are listed under the following headings:

• System Performance Criteria
• Capacity Benefit Margin Criteria
• Transmission Reserve Margin Criteria
• Facility Rating Criteria
• Model Building Criteria
• Facility Condition Criteria
• Planning Zones
• System Alternatives
• Load Forecast Criteria
• Economic Criteria
• Environmental Criteria
• Other Considerations

Planning tools  

Our planning engineers use the following computer applications to simulate the impact of potential future events on the transmission system. The same applications are used to determine how proposed solutions would address any identified adverse impacts.

• New Energy PROMOD - predicts the cost of producing energy to serve customers
• New Energy MARELI - determines "Loss of Load Expectation", a measure of the ability of system resources to meet customer demand
• Siemens (PTI) MUST - calculates the capability of the system to transfer power from one area to another while respecting thermal limitations
• Siemens (PTI) PSS/E - calculates static and dynamic power flows
• Electrotek Concepts Superharm - calculates harmonics
• PowerTech VSAT/TSAT/PSAT - calculates the capability of the system to transfer power from one area to another while respecting voltage limitations
• Power World Corp PowerWorld - calculates static power flows with a visual interface
• VNR Energy Systems Research POM/OPM - determines "Expected Unserved Energy", a measure of the ability of the system to deliver resources to meet customer demand.