Table 18. Estimated Costs of Surface Power Sources 



(Values are in thousands of dollars. 



Power Level 

 (kw) 



Depth (ft) 



600 



2,000 



6,000 



10,000 



15,000 



20,000 



30 



1,226.1 



1,381.3 



1,634.1 



1,927.9 



2,336.4 



3,050.1 



100 



1,439.2 



1,609.1 



1,847.1 



2,142.4 



2,549.4 



3,263.6 



300 



1,535.0 



1,708.1 



1,961.2 



2,268.4 



2,783.9 



3,445.9 



1,000 



2,155.7 



2,297.4 



2,553.7 



2,883.8 



3,362.4 



4,019.8 



3,000 



2,619.0 



2,775.3 



3,010.2 



3,423.3 



3,824.5 



4,660.6 



Shore-Based Power Systems 



In most cases, a DC electrical system was selected for the shore-based 

 power systems. A DC system requires conversion or rectifiers at the shore- 

 based plant and inversion equipment at the load module end. Shore-based 

 power systems require the same load module subsystems as surface-tendered 

 plants, with the addition of the DC inversion equipment and a bank of 

 capacitors. The capacitors would provide blocking voltage to stop the 

 inverter if this becomes necessary and would be mounted on the outside of 

 the module in a pressure-compensated configuration. Table 19 presents the 

 voltage levels, loads, frequency, conductor sizes, and losses for the shore- 

 based power systems. 



Physical characteristics of the shore plant were not investigated since 

 those factors are not critical for this facility. The diesel generators are 

 self-contained in the 30-kw to 300-kw power levels. The 1,000-kw and 

 3,000-kw diesel generators require cooling tower and compressed air starting 

 systems. No system was selected for the 3,000-kw load at 500 miles. The 

 protective system for the shore-based power system would be similar to that 

 of the surface plant system. Cost estimates for the shore-based power systems 

 are given in Table 20. 



A power generating plant was purposely included in the shore-based 

 power systems to provide a "worst case" cost effectiveness analysis. Electrical 

 power services available at the shore sites should be utilized if sufficient power 

 is available. 



84 



