Inclusion of distributed energy resources (DER), as a part of global decarbonization goals, are introducing operational challenges on distribution network level such as local congestion. However, flexible resources like battery storage, heat pumps, photovoltaics (PV) provide another dimension towards local congestion relief and in parallel, integrating enhanced PV production forecasts with site-specific data and local congestion insights will allow Distribution System Operators (DSOs) and aggregators to optimize PV production, benefit prosumers, and solve grid constraints cost-effectively. The research work evaluates feasibility of providing local flexibility services on top of frequency regulation services, optimize curtailment strategies such that provision of flexibility services compensate for curtailment costs and conduct techno-economic assessment of revenue streams in comparison with grid upgrading cost. PV site-specific information and forecasts serve as an input along with spot prices, ancillary services prices, curtailment penalties and solar irradiance data to evaluate available flexibility services to offer and potential revenues. Techno-economic assessment is completed on top of this to optimize benefits for both prosumers and DSOs. It is expected that introduction of flexible services can compensate for grid expansion costs for shorter periods and enable us towards the greater goal of a sustainable, resilient, and energy efficient grid.