Valuation with changing discount rate

Hi, 

Could someone help me with the following NPV calculation please? 

Let's a wind project with COD on 1/1/2029, and 2026-2028 is the construction period. There will be a PPA for the first 10 years, and afterward all merchant for another 10 years. Assuming the investor requires 8% equity IRR for the first 10 years with PPA and 9% for the rest year with merchant revenue. How to calculate the NPV of the project? Many thanks!

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