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SANTIAGO, Aug 17 (Reuters) - Chilean energy firm AES Gener said Wednesday that its Alto Maipo hydroelectric project has ran into "certain construction difficulties" and as a result the budgeted cost would rise by between 10 and 20 percent.
Alto Maipo, initially a $2.05 billion project located just outside capital Santiago, is 60 percent owned by AES Gener, with the remainder held by London-listed copper miner Antofagasta .
AEG Gener shares were down around 6 percent on Wednesday morning.
Reporting by Rosalba O'Brien; Editing by Chizu Nomiyama