--NTPC yet to decide on size of Bandanna stake to buy
--NTPC cuts generation capacity target to 70 GW from 75 GW by 2017
--NTPC cuts generation target on coal, gas supply, land acquisition issues
(Adds comments from planning commission head in 6th and 15th paragraphs, background in 8th paragraph onwards)
By Saurabh Chaturvedi and Eric Yep
Of DOW JONES NEWSWIRES
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