The critical need for storage in an energy system going in the direction of 100% renewable is well acknowledged. Important battery prices decrease and access to additional revenue streams have been key reasons to consider projects combining PV and BESS (Battery Energy Storage System). In this paper, three PV+BESS study cases are investigated: SC1: provision of ancillary services and arbitrage, SC2: electricity supply in off-grid/remote areas, SC3: self-consumption increase. First, the cost competitiveness of these study cases is evaluated using the Net Present Value, then it is compared to that of a similar PV-only project. This not only allows to determine whether PV+BESS projects can be profitable but also whether the additional revenues and savings generated thanks to the BESS compensate for the additional investment, operation and maintenance costs. Results show that with current electricity and BESS prices, PV + BESS can lead to very competitive investments in SC2 or to investments close to break-even in SC1 and SC3. In general, likely future trends (e.g., decreasing battery prices, decreasing incentives for electricity fed to the grid, diminishing average selling prices for utility-scale PV, …) should strengthen PV+BESS cases.