Germany locks in fixed payments for 20 years through feed-in tariffs. The UAE's export programs are still evolving, some offer credits with limited or no cash payout at all.
The true-up period is when it all gets settled, and that one date can decide whether your system was sized right.
Full breakdown, region by region:
https://solarbazaar.io/knowledge/net-metering/net-metering-credits-rollover-true-up
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