In this bigger power plant deck, the power plant cards 46 and 50 are in the deck twice. Always consider the new power plant with a green + (on the top right corner of the card) as the larger when deciding where to place it in the power plant market.
Because the region arrangement does not work for this variant, simply choose the appropriate number of connected cities and ignore the connections to unused cities.
Where it says number of regions in the table above that number is actually the number of cities in this case.