Andy Hoke is a senior engineer in the Power Systems Engineering Center at NREL, where he has worked since 2010. He received Ph.D. and M.S. degrees in electrical, computer, and energy engineering from the University of Colorado, Boulder, in 2016 and 2013, respectively. Hoke's expertise is in grid integration of power electronics and inverter-based renewable and distributed energy. His work includes advanced inverter controls design, hardware-in-the-loop testing and model development, power systems modeling and simulation, and standards development. He is the Chair of Institute of Electrical and Electronics Engineers (IEEE) Standards 1547.1 and P2800.2, which contain the test and verification procedures to ensure distributed energy resources and inverter-based resources conform to the grid interconnection requirements of IEEE Standards 1547 and P2800, respectively. He is a registered professional engineer in the State of Colorado.

Research Interests

Transient and dynamic modeling of power systems with very high levels of inverter-based resources, including grid-following and grid-forming inverters

Control of inverter-based resources for grid integration

Laboratory testing of inverter-based resources including power hardware-in-the-loop at small and large scale

Standards development for grid integration and interconnection of distributed and inverter-based resources connected to distribution systems and to the bulk power system


Ph.D., Electrical Engineering, University of Colorado

M.S., Electrical Engineering, University of Colorado

B.A., Engineering Physics, Dartmouth College

Professional Experience

Guest Editor, IEEE Electrification Magazine Special Issue on Island Power System Stability (2022)

Chair, Hawaiian Electric Integrated Grid Planning Technical Advisory Panel (2021–Present)

Associations and Memberships

Chair of Working Group, IEEE P2800.2: Recommended Practice for Test and Verification Procedures for Inverter-based Resources Interconnecting with Bulk Power Systems

Chair of Working Group, IEEE 1547.1-2020: Standard Conformance Test Procedures for Equipment Interconnecting Distributed Energy Resources with Electric Power Systems and Associated Interfaces

Member, Standards Technical Panel for Underwriters Laboratories Standard 1741: Inverters, Converters, and Controllers for Use in Independent Power Systems

Member of IEEE Power Electronics Society, IEEE Power and Energy Society and IEEE Standards Association

Featured Work

Island Power Systems With High Levels of Inverter-based Resources – Stability and Reliability Challenges, IEEE Electrification Magazine (2021)

Reduced-order Parameterized Short-circuit Current Model for Inverter-interfaced Distributed Generators, IEEE Transactions on Power Delivery (2021)

Estimation of Solar Photovoltaic Energy Curtailment Due to Volt-watt Control, IET Renewable Power Generation (2020)

Awards and Honors

NREL Chairperson's Award for Exceptional Performance (2021)

NREL President's Award for Outstanding Leadership (2017)

IEEE Power and Energy Society General Meeting Best Conference Paper Awards (2015 and 2017)