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Welcome to TESSA

TESSA (Thermal Energy System Simulation Assistant) is a web-based platform for planning, sizing, and simulating district heating and cooling (DHC) networks.

TESSA project view showing a district with buildings, demand summary, and energy curves

Core capabilities

  • Building demand modeling — Estimate heating and cooling loads from building footprints, archetypes, and climate scenarios.
  • Network design & sizing — Route pipe networks along roads, automatically size diameters, and simulate hydraulics and thermal losses.
  • Energy sources & geothermal — Model central plants, heat pumps, waste heat sources, and size geothermal borehole fields with seasonal regeneration.
  • Scenario comparison & financials — Evaluate design variants side-by-side with full lifecycle costing (CAPEX, OPEX, LCOH, NPV).

Getting started

  • Quick start tutorial — Step-by-step walkthrough from project creation to your first simulation.
  • Key concepts — Essential terminology and data models used throughout TESSA.
  • Feature list — Complete index of features and tools with links to detailed guides.
  • Version history — Release notes and recent capability updates.