Independent power system expertise.

Specialist grid modelling, analysis and technical advisory services supporting development, planning and operation of the power systems in Ireland and Northern Ireland.

Explore our services

About us

n minus one is an independent Irish power system consultancy providing specialist engineering and analytical services to the electricity sector across Ireland and Northern Ireland. We combine decades of technical expertise in power system modelling with practical industry experience to help clients address complex and time-critical challenges.

Our detailed understanding of the all-island electricity system, including its networks, electricity markets and regulatory arrangements, informs our work across network planning, operational analysis and electricity market studies. This allows us to account for the specific characteristics and requirements of the Irish electricity industry.

We draw on this experience to help clients understand the implications of different options and make informed decisions. We provide services to utilities, developers, regulators, research institutes and government agencies.

Our services

Grid connection modelling

  • Power flow modelling of transmission and distribution networks
  • Renewable and conventional generation capacity evaluations
  • Large energy user capacity identification
  • Short circuit current calculations
  • Single and multi-outage contingency analysis

Constraint and dispatch down analysis

  • Network constraint studies and forecasting (pro rata and grandfathered)
  • Surplus and curtailment calculations
  • Battery storage charge/discharge simulations
  • Hourly generation dispatch scheduling
  • Interconnector export/import modelling

Power system studies

  • Firm access capacity analysis
  • Future network needs identification up to 2050 and beyond
  • Grid development and reinforcement strategies
  • System adequacy and reliability assessments
  • Operational scenario and control centre assessments

Technical advisory

  • Independent technical analysis
  • Generator tariff and transmission/distribution loss adjustment factor forecasting
  • Expertise in Grid Code, Operating Security Standards and Transmission/Distribution System Security and Planning Standards
  • Advice for all electricity industry stakeholders - including utilities, regulators and developers

Contact us

Interested in discussing a project or learning more about our services? Please contact us using the following contact details:

Jeff Kelliher

Phone: +353 87 6303401

Email: jeff.kelliher@nminusone.ie