HOMER Pro 3.15
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Type: |
Output Variable |
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Units: |
km |
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Symbol: |
Dgrid |
The break-even grid extension distance is the distance from the grid that makes the net present cost of extending the grid equal to the net present cost of the stand-alone system. Farther away from the grid, the stand-alone system is optimal. Nearer to the grid, grid extension is optimal.
HOMER calculates the break-even grid extension distance using the following equation:
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where: |
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CNPC |
= total net present cost of the stand-alone power system [$] |
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CRF() |
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i |
= real discount rate [%] |
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Rproj |
= project lifetime [yr] |
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Edemand |
= total annual electrical demand (primary plus deferrable) [kWh/yr] |
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cpower |
= cost of power from the grid [$/kWh] |
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ccap |
= capital cost of grid extension [$/km] |
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com |
= O&M cost of grid extension [$/yr/km] |
