## 2 Materials and Methods
### BEIS Deterministic Calculation  
The data used for the LCOE BEIS calculation comes from Electricity Generation Costs central case scenario study for offshore round three, commissioning in 2025 [14]. The calculated parameters used for the BEIS calculation is as tabulated in Table 3.  
When authors calculated the LCOE to that of the BEIS published value shown in Table 4, there is a difference in LCOE valuations of 3% for the central case study. A very small but notable difference in value.  
Furthermore, in supportive evidence of merit for the LCOE calculator design, [PERSON] and [PERSON] [23] produced a similar LCOE summation from a detailed EXCEL spreadsheet based upon a central case study for an offshore wind farm development in 2020. Comparative analysis between the two Excel spreadsheet results from Tables 4 and 5 produced an LCOE evaluation difference of less than 1%, with only minor variations in parameter value selection. The parameter valuations used to calculate the LCOE tabulated in Table 4 derive from the UK governments own LCOE Evaluation of offshore wind energy. It is concluded that LCOE valuations produced under the BEIS designed spreadsheet in this report are reliable to within a small degree of error.  
\begin{table}
\begin{tabular}{c c c} \hline
**Windfarm Parameter** & **Value** \\ \hline Nameplate General Capacity (MW) & 844 \\ Net Capacity Factor (\%) & 48 \\ Discount Rate (\%) & 8.9 \\ Pre-development period (\(\ell\)/kW) & 120 \\ Construction (\(\ell\)/kW) & 2100 \\ Infrastructure (\(\ell\)/000 s) & 323,000 \\ Insurance (\(\ell\)/MW/year) & 45,400 \\ Connection and Use of System & 47,000 \\ Charges (\(\ell\)/MW/year) & 3100 \\ Operational Years (years) & 25 \\ LCOE (\(\ell\)/MWh) & 103.32 \\ \hline \end{tabular}
\end{table}
Table 3: Parameter calculations according to government scenario.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline
**Number** & **COAL-ASC** & **CCGT with Oxy** & **Coal-IGCC** & **CCGT H** & **OCGT** & **Offshore** \\
**PWR-FOAK** & **Comb, CCS-FOAK** & **CCS-FOAK** & **CCS-FOAK** & **CCS-FOAK** & **CCS-FOAK** & **CCS-FOAK** \\ \hline High CAPEX & 123 & 158 & 123 & 171 & 83 & 198 & 113 \\ Central & 95 & 136 & 110 & 148 & 82 & 189 & 100 \\ Low CAPEX & 85 & 125 & 102 & 137 & 80 & 182 & 88 \\ High CAPEX, high fuel & 124 & 169 & 132 & 183 & 90 & 209 & \\ Low CAPEX, low fuel & 84 & 120 & 85 & 132 & 66 & 160 & \\ \hline \end{tabular}
\end{table}
Table 4: Government LCOE Valuations.  
\begin{table}
\begin{tabular}{c c c} \hline
**Input Parameter** & **CCGT** & **Unmodified Wind Farm** & **Scaled Wind Farm** \\ \hline Capacity (MW) & 1200 & 844 & 844 \\ Availability/Capacity Factor (\%) & 93 & 48 & 48 \\ Prebuild Costs (\(\ell\)/kW) & 10 & 120 & 74 \\ Construction (\(\ell\)/kW) & 500 & 2300 & 1409 \\ Infrastructure (\(\ell\)’000 s) & 15,100 & 323,000 & 197,870 \\ Fixed O and M (\(\ell\)/MW/year) & 12,200 & 47,300 & 28,976 \\ Variable O and M (\(\ell\)/MWh/year) & 3 & 3 & 2 \\ Fuel Cost Conversion Factor (\%) (Converts fuel cost & 110 & Zero Fuel Cost & Zero Fuel Costs \\ (p/therm) to annual variable cost (\(\ell\)/MWh)) & 110 & 2000 \\ Insurance (\(\ell\)/MW/year) & 21,000 & 3300 & 2022 \\ Connection Charges (\(\ell\)/MW/year) & 3300 & 48,900 & 29,956 \\ Discount Rate (\%) & 7.8 & 8.9 & 8.9 \\ Operating Life (years) & 25 & 25 & 25 \\ LCOE (\(\ell\)/MWh) & 47.00 & 103.88 & 58.50 \\ \hline \end{tabular}
\end{table}
Table 5: Parameter Calculation according to [PERSON] and [PERSON] [23].