technologies, but it is considered prudent for this concept. In any event, the incremental margin would amount to between 15% and 20% of the total plant investment, well within cost-estimating accuracy of a novel process. Owners’ costs of 9% and IDC accruals over the 10-year construction period ($389.2 million) result in a capital requirement of some $3.1395 billion, roughly 2.5 times more expensive than the next most costly terrestrial energy investment, LMFBR. Annual operating and maintenance expenses for the facility were adjusted, from the basic NUWMAK report, to be $57.9 million/yr, which includes a 2% factor of direct and indirect costs for O&M plus scheduled replacements of other plant facilities. Total O&M costs applied to the energy output amount to 7.29 mills per kWh, adjusted from the reference report to include amortized decommissioning expenses. 3.3.7 Central-Station Terrestrial Photovoltaic (TPV) Direct construction costs^ are estimated to be $120.1 million (1978 dollars), and indirect construction amounts to $22.4 million, for a cumulative total construction cost of $142.5 million. Project contingency allowances (13.0%) of $18.5 million yield an installed plant cost of $161.0 million. Owners' costs for permits, coordination, consultants, and site selection are estimated at 10.2% of the installed plant cost, or $16.4 million in 1978 dollars. The IDC, calculated on a five-year construction period, is $9.0 million in real terms, for a capital requirement of $186.4 million in 1978 dollars, or $863.8 per installed kW. Operating expenses, in 1978 dollars, are $1.66 million per year, including $561,000 in payroll and $762,000 for the sinking fund accrual of 30% of the basic facility costs for interim replacements. The total, at an assumed 25% plant capacity factor, is calculated at 3.5 mills per kWh.
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