My guess is that "green field" is not translated (I know for sure "green field" is used in Dutch).
"C. GREEN-FIELD
Often considered as a means of generating "forward-looking" costs, the "green-field" approach addresses the inapplicability of scorched-earth results by adding a constraint to the methodology. Rather than placing the hypothetical network in a featureless landscape, the green-field approach uses the physical location of significant existing telephone facilities (such as switching centers) as a pre-determined framework for building, and costing, the network. In essentially all other respects, the approach is identical to the scorched-earth method.
This technique became a primary element in the FCC's pricing recommendations. Because it exhibits strongly "optimal" cost characteristics, prices created from this basis should mirror the pricing results of a fiercely competitive market with very capable suppliers. In essence, it captures the results of a process similar to that undertaken by a would-be entrant into the market who had the opportunity to rapidly develop the network at the same time that the market was maturing. It was this similarity to the least-cost pricing performance of a competitive market that made the approach attractive from a regulatory perspective. However, the information requirements associated with this technique are immense; this hypothetical approach probably fails, in most instances, to capture the costs of acquiring and using relevant market knowledge."

..använder en oberoende modulär metod.. dvs oberoende av arv och gamla nätverk. Egentligen är det ungefär samma sak som de tidigare förslagen, men ett annat uttryck.

Implicit in answer.