Generation Interconnect

PGE has significant practical experience managing power interconnections between Generators and Grids. Our experience, combined with our strong focus on safety, will help power plant managers effectively address electrical asset operational and optimization issues while economically meeting regulatory, market and reliability requirements. Equipped with decades of practical experience, our staff can provide optimal power generation interconnection service to the interconnection process and power plants of all fuel types, while simultaneously offering third-party evaluation for utilities and generation developers.

Our range of services include single protective Relay replacements to entire plant-wide system upgrade programs. PGE also offers a variety of studies to properly evaluate risk, reliability and stability concerns. These include a variety of studies to assist utilities in compliance with applicable NERC, Regional Reliability, industry and custom client standards. We provide manufacturer independent analysis of problems and issues within electrical systems, while also providing quality power generation interconnection service and designs that limit the effects of identified disturbances.


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Power Generation Interconnection Services

Short & Long Term Power System Studies

  • Contingency Analysis
  • P-V Analysis
  • Reliability Analysis
  • Short Circuit Analysis
  • Economic Analysis             
  • Transmission Service Request
  • Thermal/Voltage Analysis
  • Maintenance Outage Evaluations
  • Transient Stability
  • Voltage Stability (FIDVR)
  • Small Signal Stability

Generation Interconnect Evaluation

  • Feasibility Studies
  • Renewable Generation Integration
  • System Impact Studies

Interface Evaluation

  • Total Transfer Capability (TTC) Analysis

Technology Evaluation & System Analysis

  • PSS®/E                    
  • CAPE
  • Power World
  • ETAP

Portfolio Highlights

IOU Out-Of-Step Protection For Hydro Units

Southeast Region

Study consisted of a review of the transient stability of several hydro units to provide settings for out-of-step protection for the units. The study provided the impedance trajectory expected during an un-stable swing as well as a stable swing. Relay settings were provided for a distance relay that would trip for unstable swings and not trip for stable swings.

RRO Study Group Representation (SERC)


Represented the client’s interests on the SERC Near Term Study Group (NTSG) and the Eastern Interconnection Reliability Assessment Group (ERAG) by participating in coordinated study efforts for regional and inter-regional reliability assessments. This assessment involved performing voltage, thermal and transfer analysis to assess the amount of power that could be transferred among the SERC participants.

Total Transfer Capability Determination


Performed daily and monthly analysis to determine reliable Total Transfer Capability (TTC) levels for several ATC Paths. During the evaluation, it was also necessary to consider the simultaneous interaction among several paths. In addition, certain paths were required to be coordinated among entities of adjacent regions.

IOU Transmission Expansion Planning


Project consisted of performing short and long-term transmission planning studies and economic analysis in order to recommend the most cost effective transmission capital additions while ensuring compliance with applicable NERC Reliability Standards.  These studies also included periodic coordinating results and facilitating approval of necessary Transmission Capital additions among joint transmission owners within the State of Georgia.

IOU Generation Interconnect Studies

Multiple States   

Studies included a review of the steady state (thermal and voltage), stability and short circuit impacts of numerous proposed generating units applying for interconnection agreements through the Large Generator Interconnection Procedures (FERC ORDER 2003 LGIP). Network upgrades were identified as applicable to remain in compliance with applicable NERC, Regional Reliability and transmission provider planning standards.

Nuclear Plant Protective Relays


Replacement of unit primary/backup Generator and GSU Protective Relays.

Fault Induced Delayed Voltage Recovery

North Georgia

Review of the North Georgia metropolitan area for susceptibility to Fault Induced Delayed Voltage Recovery for NERC Category C and D events. Study proposed different mitigation strategies including relay settings changes, addition of redundant relaying, installation of independent-pole operated (IPO) breakers, and under voltage load shedding (UVLS) schemes to comply with applicable NERC TPL and PRC standards. This study also addressed the operational time frame and provided short term mitigation strategies including temporary relay settings requirements and generation dispatch for all feasible system load levels and system configurations until the long term projects could be implemented.

Generator Switchyard Upgrade


Provided engineering for addition of 4-on-1 Combined Cycle Generator.  Switchyard was Modified from a 4 Position Ring Bus to an 18 Breaker, 6 Bay Breaker and a ½ Layout for 3 Generator lines, 2 Auxiliary Transformer lines, and 3 underground 230 kV transmission lines.

Generation Addition


Provided Protection & Control, Substation Engineering design, Project Management, and Testing & Commissioning for 8 MW Of Generation Addition.

IOU Transient Stability Review

Brookfield Renewable

Review of the transient stability of numerous nuclear, coal, combined cycle, combustion turbine and hydro units to demonstrate compliance with NERC TPL, MOD, FAC and PRC standards. Study also provided operational guidance for equipment and relay outages. Mitigation strategies included limiting maximum MW output of units and temporary relay settings. Technical guidance was also provided for potential closing angle issues.