Jerome can confirm, but I'd assume that the main drivers for differences in cost per MWh are in the denominator ~ say, (arbitrary figures) average 40% yield vs average 30% yield. Though there'd also be an establishment cost, which could result in a country with more installed capacity being further down a degressive feed-in tariff schedule.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.