Compare indoor and outdoor sub-station on given points : (i) Capital cost (ii) Time required for completion (iii) Availability of natural light (iv) Space required 
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Sr. No. 
Points
Indoor substation
Outdoor substation 
1 Capital cost
High, as construction work cost is more. 
Less, as construction work cost is less
2 Time required for completion
More, as construction work is more
Less, as construction work is less. 
3 Availability of natural light
Natural light is not available even in day time, so there is need of illumination even during a day time. This increases energy consumption charges due to indoor installation
Natural light is available in day time, so there is no need of illumination during day time. So it saves electrical energy & its cost
4 Space Require
Less
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