Existing-gas discount and total gas credit calculator

The case adds bulk-price savings on existing gas use to recovered-heat savings. Apply the discount only when contractually supported.

Units

S_{\text{gas}} = G_{\text{existing}} \times {\Delta c_{g}} + S_{\text{heat}}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

S_{\text{gas}} = 28{,}000 \times 0.7 + 64{,}000 = 83{,}600

Symbol	Meaning	Unit
$S_{\text{gas}}$	combined gas credit	$/yr
$G_{\text{existing}}$	unchanged existing gas use eligible for discount	Mcf/yr
${\Delta c_{g}}$	old minus new gas price	$/Mcf
$S_{\text{heat}}$	recovered-heat fuel credit	$/yr

Symbol	Meaning	Unit
$S_{\text{gas}}$	combined gas credit	$/yr
$G_{\text{existing}}$	unchanged existing gas use eligible for discount	m³/year
${\Delta c_{g}}$	old minus new gas price	$/m³
$S_{\text{heat}}$	recovered-heat fuel credit	$/yr

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.