# Citigroup (C)

## C»Topics» Calculation of Tenants Chilled Water Payment

These excerpts taken from the C 10-K filed Feb 22, 2008.

Calculation of Tenant’s Chilled Water Payment

 Equipment KW Hourly cost at\$0.18kwh 1-1350 Ton Chiller operating at 500 Tons (operating at 500 Tons constant load=350 KW per floor based on .7kw/ton) 350 \$ 63.000 1-Chilled Water Pump 114.6 \$ 20.628 1-Condenser Water Pump 188 \$ 33.840 1-Cooling Tower Fan 53.3 \$ 9.594 Hourly cost for 500 tons of Chilled Water 705.9 \$ 127.062 Cost Per ton/hour for Chilled Water \$ 0.254

*** Building will need to operate on a 24X7 basis to supply chilled water to communication closets.

*** Current Load estimated at approximately 500 tons.

*** Utility rate is based on \$0.18 kwh but should be adjusted on Landlord’s average blended rate then in effect

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Calculation of Tenant’s Chilled Water Payment

 Rate EXAMPLERate 2004 Water Consumption (A ) \$ 0.0256 \$ 0.0256 Electric Consumption (B ) \$ 0.1029 Ton Hour Cost = (A)+(B) (C ) \$ 0.1285 x (1-Connected Load Tonnage Diversity Factor of .75 0.25 0.25 = Charge Pert Ton Hour \$ 0.0000 \$ 0.0321

 (A) Water Consumption rate represents the cost for makeup water for 1 ton hour of chilled water. The cost will remain constant during the lease term as it represents a de minimis increase.
 (B) Electric Consumption rate is equal to \$.1029 + ((Avg Cost per KWH - \$.1175 / \$.1175) x \$.1029) and represents the total cost for electricity to make 1 ton hour of chilled water.
 (C) The Connected Load Tonnage Diversity Factor of .75 will remain constant during the lease term.

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