An EV charging network customer operates a DC fast charging network with more than 300 sites nationwide. The EV charging network customer traditionally deployed chargers at its own sites. The charging stations were connected to the local distribution networks under separate utility service contracts. To speed up its expansion, the EV charging customer sought to install chargers on-site hosts’ properties behind their utility meters. As such, these chargers could leverage the site-hosts’ existing utility connections and service contracts. The customer’s challenge is to accurately calculate the energy costs incurred by the EV charging network’s customers when charging their EVs, so that it can reimburse the site-hosts for these costs.

To address these challenges, the EV charging network engaged CFEX to develop a solution to accurately calculate the portion of the site-hosts’ electricity costs attributable to EV charging activities and to generate invoices. CFEX proposed its Energy Cost Management Solution to model utility rates and apply them to energy consumption meter data to accurately calculate utility costs, including demand charges, for both the EV charging network and the site-hosts.

CFEX’s Energy Cost Management Solution consists of the following three applications:

• CFEX’s Meter Data Management System centralizes the management of meter data collected from the master meters and the EV charging stations.
• CFEX’s Contract Management System accurately models, validates, and maintains utility rates, fees, and taxes.
• CFEX’s Billing and Settlement System calculates the utility bills with and without the EV charging stations by applying the utility rates, fees, and taxes to the appropriate meter data.

CFEX’s Energy Cost Management Solution is integrated with two primary data feeds: utility master meter data and EV charger submeter data. Using these datasets, CFEX calculates the site-host loads by subtracting the EV charging network’s charger consumption from the total site consumption recorded at the master meter. The EV charging portions of the utility costs are calculated by netting the two utility bills.

• Billing quality – all the utility rates, fees, and taxes modeled by CFEX’s Contract Management System and the charges and bills calculated using CFEX’s Billing and Settlement System are utility-billing quality with penny-level accuracy.
• Automated operations – Once set up, this end-to-end solution has been operating reliably and automatically, calculating billing details and generating invoices every month.