Cost Estimate for Interconnection of Distributed Generation Project?

At work (oil and gas exploration company) I am being asked to research the viability of using our produced gas to generate electricity and then use that energy or sell it back to the grid.  I've been doing a lot of research but am at a bit of a stand still when it comes to getting a ballpark to what the interconnection cost would range us if we wanted to go that route.
Can anyone point me to what the main factors are?  For example if one of our facilities is very close to a substation, would that certainly be far less expensive to interconnect than a facility that is very far from a substation?  I believe if we went at full capacity it would range 1-5MW of production.
Also, if there are any online resources/models that give a good explanation of this kind of cost estimate I would greatly appreciate it.
Thanks everybody.

Hi jake,
Physical location is a big factor, cable install or overhead line install cost, the closer the better.If your gas turbine doesn't generator at the voltage of the substation that you would be connecting to, you will need to install a transformer, generally not cheap.The substation where you would be feeding into would also need to have the physical space to allow another circuit breaker to be fitted, whether or not it would be in a building or an outdoor circuit breaker. The switchboard in the substation would also need to be capable of coping with the added current generated by you plant, this is not always the case. Unless it is a new substation, there is a good chance that it would not be able to cope with the extra load. Which would mean the switchboard would need to be upgraded, expensive as you would imagine. Also you would need to consider the fact that if you are trying to connect to a utility owned substation, they will impose restriction on the type of equipment that you can use, and they usually spec quality products that are expensive. Not to suggest that you would be doing it on the cheap.It may be cheaper to build your own substation next to the transmission lines and connect direction to the grid, bypassing the existing substation. Food for thought I guess.

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In line with Alan's comment, I'd recommend that you discuss this with the utility that you intend to connect to to determine their requirements for connection and protection. They may also be able to recommend a consultant or contractor to work with who should be able to give a rough idea of the costs involved.

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