PEN Engineering connects qualified technical experts with organizations that require specialized engineering knowledge — overseeing contracts, managing liability, and ensuring every engagement is built on verified credentials.
PEN Engineering is not a passive marketplace. We vet the experts, structure the engagement, and remain accountable to both sides throughout the duration of every contract.
Every expert in the PEN network is credentialed, reviewed, and matched to specific technical domains. Clients engage with practitioners whose qualifications are confirmed before the first conversation.
Organizations bring their project scope. Experts bring their credentials. PEN Engineering facilitates the fit — not through algorithmic matching, but through deliberate, technical alignment between need and capability.
PEN Engineering structures and oversees the contract between parties — managing scope, deliverables, and liability so that both the client and the expert operate with clear protections and defined expectations.
Technical advisory and impact study support for distributed energy resource interconnection at both distribution and transmission levels. Covers IEEE 1547-2018, FERC Order 2023, and IEEE Std 2800-2022 compliance frameworks.
Electromagnetic transient simulation using PSCAD for inverter-based resource modeling, GFM/GFL studies, and dynamic performance validation. Experience with PNNL and ERCOT reference models.
Distribution system planning, load flow analysis, short circuit studies, and feeder reconfiguration analysis. Includes hosting capacity assessment and DER forecast integration using top-down methodologies.
Microgrid architecture design, controls assessment, and islanding studies. Engineering support for resiliency-focused microgrids in utility and commercial settings.
Custom Python-based tools and workflows for power system data processing, simulation output visualization, and process automation. Includes AI-assisted engineering application development.
PEN Engineering is a subsidiary of PEN LLC, a professional exchange network founded to connect verified technical experts with project-based demand across engineering and infrastructure sectors. The model is built on a conviction that high-stakes technical work requires more than a marketplace — it requires accountability at the contract level.
The firm was established in Chicago, Illinois, and is currently led by its founding expert, Hiva Nasiri, Ph.D. — a senior power systems engineer with over a decade of experience in DER integration, EMT simulation, distribution planning, and microgrid design. His academic work was conducted at the Illinois Institute of Technology under Professor Mohammad Shahidehpour, with industry mentorship from Dr. Shay Bahramirad, VP of T&D Engineering at PG&E.
Prior engagements span investor-owned utilities, independent power producers, engineering consultancies, and research institutions across the United States. Technical work includes large-scale DER interconnection studies, EMT model development and validation, and Python-based automation of engineering workflows.
PEN Engineering is the first active vertical within the PEN LLC network. As the exchange model matures, additional technical disciplines and vetted practitioners will be added — creating a structured, accountable platform for specialized engineering engagement across energy, infrastructure, and adjacent sectors.
Whether you have a defined project scope or an early-stage technical question, reach out. Engagements begin with a no-obligation technical discussion.