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HOMER Pro 3.13

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Break-even Grid Extension Distance

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Type:

Output Variable

Units:

km

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:

equations_D_grid

where:


 

 

CNPC

= total net present cost of the stand-alone power system [$]

 

CRF()

= capital recovery factor

 

i

= real discount rate [%]

 

Rproj

= project lifetime [yr]

 

Edemand

= total annual electrical demand (primary plus deferrable) [kWh/yr]

 

cpower

= cost of power from the grid [$/kWh]

 

ccap

= capital cost of grid extension [$/km]

 

com

= O&M cost of grid extension [$/yr/km]