Can you please make Use case diagram for this example :

Company (PEPCO) solicits proposals for the development of a distribution system simulation environment (DSSE) capable of modeling distributed energy resources (DER ) 1 and the impacts DER may have on distribution assets. PEPCOs specific interests are grid-enabled DER. Grid-enabled DER may act autonomously to regulate customer energy consumption. Or, they may be aggregated by PEPCO or a third party, then harnessed to act in concert to provide grid services. A DSSE capable of considering DER will help PEPCO understand how DER may be used to achieve operational objectives such as peak demand mitigation, voltage regulation, frequency regulation, and ramp rate control. These operational objectives will help PEPCO expand its portfolio of renewable resources and promote adoption of electrical appliances among its customers, thereby contributing to the reduction of greenhouse gas emissions. A DSSE that considers the impacts at the distribution level will help PEPCO deliver operational excellence by giving distribution planners a granular perspective of the characteristics and capabilities of DER. The DSSE shall model electrical system characteristics of a residential distribution system from the substation to individual household loads. The DSSE shall provide means for modeling multiple years, anticipating residential load growth, electric vehicle service equipment (EVSE) load growth, and residential photovoltaic (PV) penetration. The DSSE shall provide means for PEPCO distribution engineers to 1. analyze the impacts these factors may have on existing distribution assets. 2. plan distribution system upgrades in anticipation of projected load, PV, and EVSE growth. The DSSE shall provide means for PEPCO program developers to analyze utility programs that influence customer behavior to achieve operational objectives, such as: 1. rate structures, e.g. time-of-use rates 2. peak demand charges 3. incentivized demand response programs The DSSE shall provide distribution planners means for considering how DER could be used to achieve operational objectives on a distribution system, such as 1. coordinated dispatch of DER 2. autonomous DER responses (e.g. f-P and V-VAr curves) 1 DER are customer-owned generation, storage, and load assets that are grid-enabled. These resources are located behind a customer meter and are not directly managed by utilities. 3. third party DER load control programs (e.g. Nest) PEPCO is interested grid-enabled DER such as: 1. water heaters, both resistance and heat pump 2. HVAC equipment (e.g. heat pumps, air conditioners) 3. HVAC systems, such as via thermostats 4. EVSE, or direct to EV 5. Stationary inverter-based systems, e.g BIS and PV 6. and others PEPCO is also interested in devices that provide a means for controlling traditional appliances, such as: 1. devices that allow autonomous load sharing (e.g. NeoCharge) 2. remotely controllable circuit breakers (e.g. Eaton EMCBs) PEPCO invites proposals for the development of a DSSE. Proposals shall include 1. An analysis of system Actors and Objects 2. Consideration of plausible Use Cases 3. DSSE Products Requirements 4. Test Plans for the Product Requirements 5. Project Timeline 6. Project Budget Respondents are encouraged also to submit a demonstration prototype.