Free Online Geothermal Well Output Calculator: Thermal Power and MWe

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Thermal power is mass flow times heat capacity times the temperature drop you take from the fluid. District heating uses that heat directly; a binary power plant at these temperatures keeps roughly a tenth of it as electricity. The capacity factor converts the rating into the annual energy a utility actually buys.

The one-line physics of a geothermal well

Every geothermal doublet, from a Munich district heating well to an Icelandic power producer, obeys one line of physics: thermal power equals mass flow times heat capacity times the temperature drop you take from the fluid. The tool above computes it, converts to electricity at your chosen efficiency, and multiplies through a capacity factor into the annual gigawatt-hours a heat network or grid actually receives. Eighty kilograms per second cooled by a hundred degrees is 33.6 thermal megawatts, a number worth having in your head.

Geothermal doublet diagram with a hot production well and a cooled reinjection well connected through a surface heat plant, with the thermal power formula alongside
One line of physics: mass flow times heat capacity times the temperature drop is the power of every geothermal doublet.

This completes the CO2 Storage and Geothermal Suite in the bar above: capacity and plume for the storage side, resource and well output for the heat side, with the fracture gradient and porosity calculators serving both.

What moves the number

  • Flow rate is the fight: it is set by reservoir permeability and pump capability, which is why a pumping test is the single most valuable data point in a geothermal well.
  • The temperature drop is a design choice: district heating can take the fluid down to 40 or 50 degrees and harvest far more heat than a power cycle that reinjects at 80.
  • Electric conversion at these temperatures is thermodynamically capped near 10 to 13 percent; heat use skips that penalty entirely, which is why direct use dominates geothermal energy delivered worldwide.
  • The capacity factor is geothermal advantage in one number: 90 percent and better, running through nights and winters that idle solar and wind.

What this tool is for

Sizing a doublet for a heat network, screening whether a flow test supports a power project, and putting real numbers under energy transition conversations. Wellbore heat loss, pump power, and cycle detail refine the answer at the few-percent level; the headline is this arithmetic.

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