ClueLuma

DG net annual savings calculator

The case combines energy, demand and gas benefits then subtracts fuel and maintenance. Include further project charges when present.

Snet=Se+Sd+Sgas−Cfuel−COMS_{\text{net}} = S_{e} + S_{d} + S_{\text{gas}} - C_{\text{fuel}} - C_{\text{OM}}

Calculator

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

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Worked example

Given

  • SeS_{e} = 240,000 $/yr
  • SdS_{d} = 36,000 $/yr
  • SgasS_{\text{gas}} = 78,000 $/yr
  • CfuelC_{\text{fuel}} = 185,000 $/yr
  • COMC_{\text{OM}} = 42,000 $/yr
Snet=240,000+36,000+78,000−185,000−42,000=127,000S_{\text{net}} = 240{,}000 + 36{,}000 + 78{,}000 - 185{,}000 - 42{,}000 = 127{,}000

Symbols and units

SymbolMeaningUnit
SnetS_{\text{net}}net yearly savings$/yr
SeS_{e}electricity-energy credit$/yr
SdS_{d}demand-charge credit$/yr
SgasS_{\text{gas}}existing-gas discount plus heat credit$/yr
CfuelC_{\text{fuel}}DG fuel cost$/yr
COMC_{\text{OM}}DG maintenance/material cost$/yr

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