Moving Power Forward
Northern Plains Power Technologies


About Us


Northern Plains Power Technologies (NPPT) is a power engineering consulting firm based in Brookings, SD USA and founded in 2005 by Dr. Michael Ropp, a Georgia Tech PhD graduate in EE and a licensed PE.  We specialize in two areas:  engineering for distributed generation plants and interconnects (including energy storage), and engineering for low-inertia power systems, such as microgrids, remote villages, island power, campus power, or other off-grid power systems.  We have particular expertise in systems containing power electronics or software-controlled devices, and we can handle code development and deployment in-house.  Our engineering team has decades of person-years of experience, and is highly skilled, creative, professional, easy to work with, and cost-effective. 
Typical applications of NPPT’s capabilities include:

  • Distribution circuit studies, including:
    • Studies of circuits with high penetrations of distributed energy resources
    • Studies of any system including large amounts of inverters (DERs, EV charging, rail rectifiers, FACTS devices)
    • Protection design, coordination and implementation in circuits with multiple and current-limited sources
  • Distributed generation engineering, including:
    • Interconnection studies (including load flow types, transient, or EMTP-types, and dynamic, or PSS/E-types)
    • Special studies, such as risk of islanding, PQ impacts, and flicker
    • Custom controls design
    • Plant design, deployment and monitoring
  • Microgrid engineering, including:
    • Controls design, including seamless transitions from on-grid to off-grid and back, and interactions between sources within the microgrid
    • Integration of PV or battery storage into existing diesel microgrids
    • Integration of system controls and EMS
    • Protection, even with multiple sources
    • Microgrid modeling, for assistance with planning processes and system design 
  • Trustworthy modeling of DG, including inverter-based or rotating devices, and also including energy storage devices
  • Accurate assessments of the impact of unusual loads, such as large motor loads and motor starts, harmonic-producing loads, or pulsed loads
    Support of system planning involving FACTS devices, such as STATCOMS and D-VARs
    Controls design for distributed generation plants
  • Distribution automation, including setup of relaying systems for self-healing, automatically-reconfiguring feeders for improved system reliability and robustness to storm damage (FLISR and ANR), on feeders with varying levels of complexity (presence of DG, networks or non-radial systems, multiple system goals)
  • Effective grounding of distributed generation
  • Engineering support for volt-VAr optimization efforts

A list of selected recent clients:

  • ABB
  • Advanced Energy Industries
  • Ballinger
  • BEW Engineering (now part of DNV-KEMA)
  • Black Hills Power
  • Control Point Engineering
  • Dominion Virginia Power
  • Electric Power Research Institute (EPRI)
  • Energy Initiatives Group (EIG)
  • Enfinity Corporation
  • Enphase Energy
  • enXco
  • Florida Solar Energy Center
  • Gehrlicher Solar (part of the MW Group)
  • Hawaiian Electric Company
  • Leidos
  • Maui Electric Company Ltd.
  • Midstates Electric Cooperative (Oregon)
  • National Grid
  • Otter Tail Power Company
  • Parker Hannifin
  • Portland General Electric
  • Power Engineers
  • Pristine Sun LLC
  • Sandia National Laboratories
  • Signal Energy
  • SolarCity
  • Texas Instruments
  • TRC Solutions
  • Unitil 

NPPT investigators also participate on several of the IEEE 1547, IEEE 1653, and IEEE 1881 standard working groups; the WECC Renewable Energy Modeling Task Force; and the Forum for Inverter-Grid Interface Issues (FIGII).

Contact Us


MAS Media