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Posted by Steve on January 29, 2012, 6:15 pm
 
Mho,

Thanks for that.  So then you are suggesting that if Hawaii wants 500MW of
new PV capacity, it would be cheaper to go "distributed", with 1,000s of
rooftops covered, rather than one of more giant projects?

FYI, as we speak Hawaii is considering a $B+ undersea cable, installed
simply to move future renewable capacity around the islands, mostly to Oahu.

Steve



Posted by Mho on January 29, 2012, 7:35 pm
 
OTOH:

The grid is and usually has to be (dark doesn't work well) already in place.
Now if the sources of generation are relatively close (geographically) or
their grid is built without depreciating capacity then it may be cheap to
add the PV sources.

"Depreciating capacity" is something we ran into when we purchased a hunk of
the old Ontario Hydro grid and customers. Their concept was always feed from
one end with big conductors and as load and customer fall off you save on
conductor metal by reducing size of conductor down to very small to feed the
last customer. Ours wasn't as we ran complete redundancy.  Now suppose you
want to add a PV co-gen at the other end. Now you have no capability to
backfeed this grid spur line. If you build your grid fairly consistent in
conductor capacity, you don't have that problem and adding an alternative
source anywhere is not a problem. This was considered an unnecessary
extravagance.

Distributed co-gen sources avoid some of the losses and some of the grid
size and cost.... only during sunlight or other source times.


------------

Mho,

Thanks for that.  So then you are suggesting that if Hawaii wants 500MW of
new PV capacity, it would be cheaper to go "distributed", with 1,000s of
rooftops covered, rather than one of more giant projects?

FYI, as we speak Hawaii is considering a $B+ undersea cable, installed
simply to move future renewable capacity around the islands, mostly to Oahu.

Steve



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