As Arctic Sea ice melts, the navigability window of the Arctic shipping routes lengthens, potentially halving container ships' sailing days between Europe and the Pacific. Increased Arctic shipping traffic could exacerbate climate change impacts with global implications and consequences. A green shipping corridor (GSC) in the Arctic could kickstart the transition towards zero-emission shipping in the region, inspiring other regions to follow. This chapter takes Project Neptun Tromsø as a case study to identify the key factors affecting the value chain and examine their interactions. The technological and regulatory prospects for a GSC in the Arctic by 2030 appear promising. However, socio-political factors like the economic and geopolitical impacts of the ongoing Russia-Ukraine war, and uncertainties in the energy governance in Svalbard, could impede project progress. Particularly, the role of ammonia in Longyearbyen's future energy system is a critical factor.