I hope you are doing well.
I think we might be able to help here... The following document (WBG - 2014) explains the methodology used by the bank to calculate "inferred connections" on page 4. I have uploaded it on the Forum, and you can access it directly using the following link: WBG (2014) - Livewire - Measuring the Results of World Bank Lending in the Energy Sector.pdf
Thanks to Sudeshna Ghosh Banerjee for writing it, and pointing it out to me.