The paper analyses Polish industrial energy market requirements and the economic boundary conditions of for High Temperature Reactor (HTR)-based hybrid energy systems for electricity, heat, and hydrogen production. The Polish industry suffers from high imported gas prices and high dependence on domestic coal sector. Most industrial coal boilers are ageing and will need replacement within two decades. Increasing emission prices will soon cripple the profitability of coal in favour of natural gas and leave an opening for HTRs. HTRs can be competitive for both heat and electricity generation if used at load factors above 90% and constructed within budget and on time. The competitiveness of HTRs grows further with rising fossil fuels and CO2 emission prices. For industrial hydrogen, steam methane reforming (SMR) is competitive against any other alternative. Large-scale hydrogen production with HTR-based Sulphur Iodine cycle may compete with SMR if capital and operational costs can be decreased. High temperature steam electrolysis requires more durable materials and lower capital cost. Electrolysis, given its relatively low CAPEX and scalability, can be competitive when electricity is cheap as a result of overproduction from intermittent power capacities. Other fossil-based hydrogen production methods appear more costly and CO2-intensive than SMR. The study was done as a part of the GEMINI+ project.