Cumulative Revenue miscalculation?

[softwareengineerprogrammer]

A user pointed out an apparent mismatch between yearly heat revenue and cumulative revenue, is this a miscalculation/bug?

https://gtp.scientificwebservices.com/geophires/?shared-geophires-result-id=7baab71f-52ff-4560-bdc5-c23ec7f68899

# Example 2: Geothermal Direct-Use Example Problem using a Linear Heat Sweep Model.
# This problem considers an EGS reservoir at 3km depth.
# Ramey's model is applied to simulate production wellbore heat losses. The heat
# is used in direct-use heat application with reinjection temperature of 70deg.C

# ***Subsurface Technical Parameters***
# *************************************

Reservoir Model,2,						---Linear Heat Sweep Model
Reservoir Depth,3,						---[km]
Number of Segments,1,						---[-]
Gradient 1,55,							---[deg.C/km]
Number of Production Wells,2,					---[-]
Number of Injection Wells,2,					---[-]
Production Well Diameter,8,					---[inch]
Injection Well Diameter,8,					---[inch]
Ramey Production Wellbore Model,1,				---Should be 0 (disable) or 1(enable)
Injection Wellbore Temperature Gain,0,				---[deg.C]
Production Flow Rate per Well,30,				---[kg/s]
Fracture Shape,2,						---Should be 1 2 3 or 4. See manual for option details
Fracture Height,300,						---[m]
Reservoir Volume Option,2,					---Should be 1 2 3 or 4. See manual for option details
Fracture Separation,60,						---[m]
Reservoir Impedance,0.2,					---[GPa*s/m3]
Injection Temperature,70,					---[deg.C]
Maximum Drawdown,.3,						---Should be between 0 and 1 depending on redrilling
Reservoir Heat Capacity,975,					---[J/kg/K]
Reservoir Density,3000,						---[kg/m3]
Reservoir Thermal Conductivity,3.2,				---[W/m/K]
Reservoir Porosity,.1,						---[-]

# ***Surface Technical Parameters***
# **********************************
End-Use Option,2,						---Direct Use Heat
Circulation Pump Efficiency,.8,					---[-]
Utilization Factor,.9,						---[-]
End-Use Efficiency Factor,.9,					---[-]
Surface Temperature,15,						---[deg.C]

# ***Financial Parameters***
# **************************

Plant Lifetime,25,						---[years]
Economic Model,2,						---Standard Levelized Cost Model
Discount Rate,.05,						---[-]
Inflation Rate During Construction,0,				---[-]

# ***Capital and O&M Cost Parameters***
# *************************************

Well Drilling and Completion Capital Cost Adjustment Factor,1,	---[M$/well] Use built-in correlations
Well Drilling Cost Correlation,1,				---[-]
Reservoir Stimulation Capital Cost Adjustment Factor,1, 	---[-] Use built-in correlations
Surface Plant Capital Cost Adjustment Factor,1,			---[-] Use built-in correlations
Field Gathering System Capital Cost Adjustment Factor,1,	---[-] Use built-in correlations
Exploration Capital Cost Adjustment Factor,1,			---[-] Use built-in correlations
Wellfield O&M Cost Adjustment Factor,1,				---[-] Use built in correlations
Surface Plant O&M Cost Adjustment Factor,1,			---[-] Use built-in correlations
Water Cost Adjustment Factor,1,					---[-] Use built-in correlations
Electricity Rate,.05,						---[$/kWh]

# ***Simulation Parameters***
# ***************************
Print Output to Console,1,					---should be either 0 (do not show) or 1 (show)
Time steps per year,3,						---[-]

                               *****************
                               ***CASE REPORT***
                               *****************

Simulation Metadata
----------------------
 GEOPHIRES Version: 3.5.0
 Simulation Date: 2024-08-03
 Simulation Time:  22:22
 Calculation Time:      0.893 sec

                           ***SUMMARY OF RESULTS***

      End-Use Option: Direct-Use Heat
      Average Direct-Use Heat Production:                    21.47 MW
      Direct-Use heat breakeven price (LCOH):                  7.16 USD/MMBTU
      Number of production wells:                             2
      Number of injection wells:                              2
      Flowrate per production well:                          30.0 kg/sec
      Well depth (or total length, if not vertical):          3.0 kilometer
      Geothermal gradient:                                     55 degC/km


                           ***ECONOMIC PARAMETERS***

      Economic Model = Standard Levelized Cost
      Interest Rate:                                          5.00 
      Accrued financing during construction:                  0.00 
      Project lifetime:                                      25 yr
      Capacity factor:                                       90.0 %
      Project NPV:                                          -1.01 MUSD
      Project IRR:                                           5.97 %
      Project VIR=PI=PIR:                                    0.98
      Project MOIC:                                          0.52
      Project Payback Period:                               13.21 yr

                          ***ENGINEERING PARAMETERS***

      Number of Production Wells:                             2
      Number of Injection Wells:                              2
      Well depth (or total length, if not vertical):          3.0 kilometer
      Water loss rate:                                        0.0 
      Pump efficiency:                                       80.0 
      Injection temperature:                                 70.0 degC
      Production Wellbore heat transmission calculated with Ramey's model
      Average production well temperature drop:               6.5 degC
      Flowrate per production well:                          30.0 kg/sec
      Injection well casing ID:                               8.000 in
      Production well casing ID:                              8.000 in
      Number of times redrilling:                             0


                         ***RESOURCE CHARACTERISTICS***

      Maximum reservoir temperature:                        400.0 degC
      Number of segments:                                     1 
      Geothermal gradient:                                        55 degC/km


                           ***RESERVOIR PARAMETERS***

      Reservoir Model = 1-D Linear Heat Sweep Model
      Bottom-hole temperature:                              180.00 degC
      Fracture model = Circular fracture with known diameter
      Well separation: fracture diameter:                   300.00 meter
      Fracture area:                                      70685.83 m**2
      Number of fractures calculated with reservoir volume and fracture separation as input
      Number of fractures:                                   30.47
      Fracture separation:                                   60.00 meter
      Reservoir volume:                               125000000 m**3
      Reservoir impedance:                                    0.20 GPa.s/m**3
      Reservoir density:                                   3000.00 kg/m**3
      Reservoir thermal conductivity:                         3.20 W/m/K
      Reservoir heat capacity:                              975.00 J/kg/K
      Reservoir porosity:                                    10.00 


                           ***RESERVOIR SIMULATION RESULTS***

      Maximum Production Temperature:                       172.8 degC
      Average Production Temperature:                       165.3 degC
      Minimum Production Temperature:                       153.8 degC
      Initial Production Temperature:                       169.9 degC
      Average Reservoir Heat Extraction:                     23.86 MW
      Production Wellbore Heat Transmission Model = Ramey Model
      Average Production Well Temperature Drop:               6.5 degC
      Total Average Pressure Drop:                        10524.3 kPa
      Average Injection Well Pressure Drop:                 112.9 kPa
      Average Reservoir Pressure Drop:                    12533.0 kPa
      Average Production Well Pressure Drop:                118.2 kPa
      Average Buoyancy Pressure Drop:                     -2239.8 kPa


                          ***CAPITAL COSTS (M$)***

         Drilling and completion costs:                      21.95 MUSD
         Drilling and completion costs per well:              5.49 MUSD
         Stimulation costs:                                   3.02 MUSD
         Surface power plant costs:                           8.29 MUSD
         Field gathering system costs:                        2.57 MUSD
         Total surface equipment costs:                      10.85 MUSD
         Exploration costs:                                   5.33 MUSD
      Total capital costs:                                   41.15 MUSD


                ***OPERATING AND MAINTENANCE COSTS (M$/yr)***

         Wellfield maintenance costs:                         0.43 MUSD/yr
         Power plant maintenance costs:                       0.67 MUSD/yr
         Water costs:                                         0.00 MUSD/yr
         Average Reservoir Pumping Cost:                      0.31 MUSD/yr
      Total operating and maintenance costs:                  1.41 MUSD/yr


                           ***SURFACE EQUIPMENT SIMULATION RESULTS***

      Maximum Net Heat Production:                           23.17 MW
      Average Net Heat Production:                           21.47 MW
      Minimum Net Heat Production:                           18.88 MW
      Initial Net Heat Production:                           22.52 MW
      Average Annual Heat Production:                       167.12 GWh
      Average Pumping Power:                                  0.80 MW

                            ************************************************************
                            *  HEATING, COOLING AND/OR ELECTRICITY PRODUCTION PROFILE  *
                            ************************************************************
  YEAR       THERMAL               GEOFLUID               PUMP               NET
             DRAWDOWN             TEMPERATURE             POWER              HEAT
                                   (deg C)                (MW)               (MW)
   0           1.0000                169.90               0.7816           22.5203
   1           1.0073                171.13               0.7810           22.7994
   2           1.0110                171.77               0.7806           22.9429
   3           1.0130                172.10               0.7804           23.0176
   4           1.0143                172.32               0.7803           23.0671
   5           1.0152                172.48               0.7802           23.1037
   6           1.0160                172.61               0.7802           23.1324
   7           1.0166                172.71               0.7801           23.1559
   8           0.9964                169.28               0.7882           22.3811
   9           0.9923                168.58               0.7899           22.2238
  10           0.9879                167.84               0.7917           22.0568
  11           0.9833                167.06               0.7936           21.8812
  12           0.9785                166.25               0.7955           21.6977
  13           0.9735                165.40               0.7975           21.5069
  14           0.9684                164.52               0.7995           21.3091
  15           0.9630                163.62               0.8016           21.1050
  16           0.9576                162.69               0.8037           20.8950
  17           0.9519                161.73               0.8059           20.6795
  18           0.9462                160.75               0.8081           20.4588
  19           0.9403                159.75               0.8103           20.2335
  20           0.9343                158.73               0.8125           20.0037
  21           0.9282                157.70               0.8148           19.7700
  22           0.9220                156.64               0.8171           19.5326
  23           0.9157                155.57               0.8195           19.2918
  24           0.9093                154.49               0.8218           19.0480


                              *******************************************************************
                              *  ANNUAL HEATING, COOLING AND/OR ELECTRICITY PRODUCTION PROFILE  *
                              *******************************************************************
  YEAR               HEAT                       HEAT                RESERVOIR            PERCENTAGE OF
                    PROVIDED                   EXTRACTED            HEAT CONTENT        TOTAL HEAT MINED
                   (GWh/year)                  (GWh/year)            (10^15 J)                 (%)
   1                 178.4                       198.2                 39.51                   1.77
   2                 180.4                       200.4                 38.78                   3.57
   3                 181.2                       201.3                 38.06                   5.37
   4                 181.7                       201.9                 37.33                   7.18
   5                 182.0                       202.2                 36.60                   8.99
   6                 182.3                       202.5                 35.88                  10.80
   7                 182.5                       202.7                 35.15                  12.62
   8                 181.6                       201.8                 34.42                  14.42
   9                 175.8                       195.4                 33.72                  16.17
  10                 174.6                       194.0                 33.02                  17.91
  11                 173.2                       192.5                 32.32                  19.63
  12                 171.8                       190.9                 31.64                  21.34
  13                 170.3                       189.2                 30.96                  23.03
  14                 168.8                       187.5                 30.28                  24.71
  15                 167.2                       185.8                 29.61                  26.37
  16                 165.6                       184.0                 28.95                  28.02
  17                 163.9                       182.1                 28.29                  29.65
  18                 162.2                       180.2                 27.65                  31.26
  19                 160.4                       178.2                 27.00                  32.86
  20                 158.6                       176.2                 26.37                  34.44
  21                 156.8                       174.2                 25.74                  35.99
  22                 154.9                       172.1                 25.12                  37.54
  23                 153.0                       170.1                 24.51                  39.06
  24                 151.1                       167.9                 23.91                  40.56
  25                  99.7                       110.8                 23.51                  41.55


                             ********************************
                             *  REVENUE & CASHFLOW PROFILE  *
                             ********************************
Year            Electricity             |            Heat                  |           Cooling                 |         Carbon                    |          Project
Since     Price   Ann. Rev.  Cumm. Rev. |   Price   Ann. Rev.   Cumm. Rev. |  Price   Ann. Rev.   Cumm. Rev.   |   Price   Ann. Rev.   Cumm. Rev.  | OPEX    Net Rev.      Net Cashflow
Start    (cents/kWh)(MUSD/yr) (MUSD)    |(cents/kWh) (MUSD/yr)    (MUSD)   |(cents/kWh) (MUSD/yr)    (MUSD)    |(USD/tonne) (MUSD/yr)    (MUSD)    |(MUSD/yr) (MUSD/yr)    (MUSD)
________________________________________________________________________________________________________________________________________________________________________________________
  1      0.00           0.00   0.00     |    0.00    -41.15         0.00    |    0.00     0.00         0.00     |    0.00     0.00         0.00     |  0.00     -41.15     -41.15
  2      5.50           0.00   0.00     |    2.50     3.36         4.46    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.36     -37.78
  3      5.50           0.00   0.00     |    2.50     3.41         8.97    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.41     -34.37
  4      5.50           0.00   0.00     |    2.50     3.43        13.50    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.43     -30.94
  5      5.50           0.00   0.00     |    2.50     3.45        18.04    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.45     -27.49
  6      5.50           0.00   0.00     |    2.50     3.45        22.59    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.45     -24.04
  7      5.50           0.00   0.00     |    2.50     3.46        27.15    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.46     -20.58
  8      5.50           0.00   0.00     |    2.50     3.46        31.71    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.46     -17.11
  9      5.50           0.00   0.00     |    2.50     3.44        36.25    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.44     -13.67
 10      5.50           0.00   0.00     |    2.50     3.30        40.65    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.30     -10.37
 11      5.50           0.00   0.00     |    2.50     3.27        45.01    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.27     -7.10
 12      5.50           0.00   0.00     |    2.50     3.23        49.34    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.23     -3.87
 13      5.50           0.00   0.00     |    2.50     3.20        53.64    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.20     -0.67
 14      5.50           0.00   0.00     |    2.50     3.16        57.89    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.16      2.49
 15      5.50           0.00   0.00     |    2.50     3.12        62.11    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.12      5.61
 16      5.50           0.00   0.00     |    2.50     3.08        66.29    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.08      8.70
 17      5.50           0.00   0.00     |    2.50     3.04        70.43    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.04     11.74
 18      5.50           0.00   0.00     |    2.50     3.00        74.53    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      3.00     14.74
 19      5.50           0.00   0.00     |    2.50     2.96        78.58    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      2.96     17.70
 20      5.50           0.00   0.00     |    2.50     2.91        82.59    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      2.91     20.61
 21      5.50           0.00   0.00     |    2.50     2.87        86.56    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      2.87     23.48
 22      5.50           0.00   0.00     |    2.50     2.82        90.48    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      2.82     26.30
 23      5.50           0.00   0.00     |    2.50     2.78        94.35    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      2.78     29.08
 24      5.50           0.00   0.00     |    2.50     2.73        98.18    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      2.73     31.81
 25      5.50           0.00   0.00     |    2.50     2.68        101.96    |    2.50     0.00         0.00     |    0.00     0.00         0.00     |  1.10      2.68     34.49