 Control of water was the primary concern in the building of the dam . Power generation has allowed the dam project to be self @-@ sustaining : proceeds from the sale of power repaid the 50 @-@ year construction loan , and those revenues also finance the multimillion @-@ dollar yearly maintenance budget . Power is generated in step with and only with the release of water in response to downstream water demands . 
 Control of water was the primary concern in the building of the dam . Power generation <a href='been_done' title='1'><mark>has</mark></a> allowed the dam project to be self @-@ sustaining : proceeds from the sale of power repaid the 50 @-@ year construction loan , and those revenues also finance the multimillion @-@ dollar yearly maintenance budget . Power is generated in step with and only with the release of water in response to downstream water demands . 
Control of water was the primary concern in the building of da dam . Power generation done allowed tdadam project to be self @-@ sustaining : proceeds from thdaale of power repaid the 50 @-@ year construction loan , and those revenues also finance thedaltimillion @-@ dollar yearly maintenance budget . Power is generated in step with and only with the daease of water in response to downstream water demands .