01 — CONTEXT & INVESTMENT CHALLENGE
Improving Hospital Energy Efficiency Through Integrated On-Site Generation.
Tauberbischofsheim Hospital, a regional healthcare facility in Germany, required an energy supply solution that could improve efficiency while integrating with its existing heating infrastructure.
The investment challenge was to evaluate whether combined heat and power generation could deliver economic and environmental benefits compared with conventional separate electricity and heat supply.
The solution also needed to meet the hospital’s continuous energy requirements and provide a commercially viable investment case.
02 — TECHNICAL SCOPE & KEY MEASURES
Integrating Combined Heat and Power with Existing Hospital Energy Systems.
The project involved retrofitting a natural gas-fired CHP installation comprising two generation modules and an additional thermal storage tank.
The system simultaneously generated electricity for on-site consumption and recovered thermal energy for hospital space heating and air-conditioning systems.
The thermal storage provided additional flexibility in matching heat generation with hospital demand, supporting the integration of the CHP installation into the existing energy infrastructure.
03 — INVESTMENT APPROACH
Evaluating Lifecycle Economics from Both Customer and Contractor Perspectives.
The investment assessment considered the technical configuration and lifecycle economics of the proposed CHP installation.
For the hospital, the analysis evaluated the economic benefits of integrated electricity and heat generation over the system’s operating life.
For the energy contractor, a separate investment return calculation assessed the commercial viability of financing and implementing the project.
The resulting investment case was prepared for approval by the contractor’s Executive Committee, connecting technical design decisions with financial returns and investment risk.
04 — INVESTMENT CASE & OUTCOME
Reducing CO₂ Emissions by Approximately 41% Through Integrated Generation.
Compared with separate electricity and heat generation, the CHP installation achieved an estimated 41% reduction in CO₂ emissions.
The calculation was based on the 1996 German electricity generation mix, with an emission factor of 680 g CO₂/kWh, and a reference boiler efficiency of 90%.
The installation remained operational until the comprehensive refurbishment of the hospital’s central energy plant in 2016, representing approximately 20 years of operation.
The project demonstrated how integrated energy generation could combine emissions reduction with lifecycle investment considerations.
05 — ROLE OF WINFRIED HAAS
Leading Technical Development, Investment Evaluation and Project Delivery.
As Head of Energy Consulting within an energy contracting company, Winfried Haas held responsibility for the technical and commercial development and implementation of the CHP retrofit.
His responsibilities included system design, proposal preparation, engineering and planning, lifecycle economic analysis for the hospital and contractor-side investment return calculations.
He also prepared the investment case for Executive Committee approval and managed construction, installation, commissioning and performance verification.
The engagement covered the project lifecycle from initial technical and economic evaluation through implementation and commissioning.
06 — RELEVANCE FOR OWNERS TODAY
Evaluate Integrated Energy Alternatives Through Lifecycle Economics and Performance.
Major building energy investments should be assessed not only on technical efficiency, but also on their lifecycle economics, operational requirements and long-term performance.
This project illustrates the importance of comparing integrated energy supply alternatives and connecting engineering decisions with investment returns and measurable environmental outcomes.
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