Technology
CHP
Cogeneration
The simultaneous production of electricity and useful heat in one process. Viability depends on whether the facility can use both outputs at the right times.
#Ettcogen · knowledge base
Energy and financing glossary
Short, practical explanations of terms used when designing, financing and assessing energy systems.
Technology
CCHP
Trigeneration
Cogeneration extended with cooling, usually through an absorption chiller powered by part of the recovered heat. The same heat cannot be counted both as useful heat and as cooling input.
#Technology
BESS
Battery energy storage system
A system combining batteries, power conversion, protection and controls. It shifts energy in time; it does not generate energy by itself.
#Financing
EaaS
Energy as a Service
A model in which the customer uses an energy system or outcome under a contract. Financing, ownership, operation and settlement may be shared among different parties; EaaS does not always mean zero customer CAPEX.
#Financing
CAPEX
Capital expenditure
Spending needed to design, purchase, build and commission an installation. CAPEX should cover the complete implementation, not only the main unit.
#Financing
OPEX
Operating expenditure
Ongoing system costs such as fuel, service, auxiliary energy, consumables and fees. They should be assessed over the operating life.
#Financing
ROI
Return on investment
The relationship between financial benefit and capital employed. The result depends on methodology, period, taxes and financing and is not the same as simple payback.
#Financing
SPBT
Simple payback time
An indicative period until cumulative net savings equal the investment. It normally ignores the time value of money and does not replace a full financial analysis.
#Data and operation
Self-consumption
Using energy on site
The share of energy produced at a facility and consumed there immediately. High self-consumption may reduce grid purchases, but it does not guarantee viability on its own.
#Data and operation
Load profile
Energy demand over time
Demand measured in consecutive intervals, such as every 15 minutes or hour. An annual total does not show peaks or whether power, heat and cooling demand overlap.
#Data and operation
kW, kWe, kWt, kWh and MWh
Power versus energy
kW describes instantaneous power, while kWh or MWh describes energy used or produced over time. kWe denotes electrical power and kWt thermal power.
#Technology
EMS
Energy management system
A supervisory system that gathers data and controls sources, storage and loads according to a defined objective. It can cooperate with BMS and SCADA but is not the same thing.
#Technology
Absorption chiller
Cooling from heat
Equipment that uses thermal energy to produce chilled water or cooling. It also needs auxiliary electricity and effective heat rejection.
#Technology
Peak source
Extra capacity for peaks
A source used when demand exceeds the base unit’s capacity or when the base system is unavailable. It may be a boiler or the electricity grid.
#Technology
H₂-ready
Ready for a hydrogen blend
Readiness to operate under specified conditions with a hydrogen-containing fuel. For ASV 14–40, confirmation covers natural gas with up to 20% H₂ by volume/molar share, not pure hydrogen.
#Data and operation
Peak shaving
Reducing power peaks
Reducing the highest power demand through load control, storage or local generation. The financial effect depends on the tariff and capacity charging method.
#Technology
LPG
Liquefied gas and technical propane
Fuel stored in liquid form. It can supply a suitable unit version when composition and parameters meet manufacturer and project requirements.
#Technology
Biogas and sewage gas
Gas fuels from biological processes
Gases produced from organic matter or wastewater treatment. Their composition can vary, so fuel quality, treatment and the correct unit version must be assessed.
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Short, practical explanations of terms used when designing, financing and assessing energy systems.