As solar photovoltaics (PV) expand rapidly worldwide, electricity markets and regulatory frameworks must adapt to integrate increasing shares of variable renewable energy. This paper provides a structured qualitative comparison of PV participation in energy, capacity, and balancing markets across eight countries: Germany, Switzerland, France, Italy, Denmark, Finland, Norway, and Morocco. It analyses market participation rules, remuneration mechanisms, exposure to wholesale price signals, and access to flexibility and balancing services. The results show that although similar policy and market instruments are used across countries, their design and relevance differ substantially depending on market structures, renewable resource endowments, and regulatory priorities. The comparison highlights increasing efforts to promote system-friendly operation and stronger market coordination, while underlining the need to preserve investment security under rising PV penetration.