As electric vehicle (EV) adoption accelerates, the reliability and accuracy of charging infrastructure have become paramount. In the United States, the number of public EV charging stations has grown significantly, with over 71,000 stations housing approximately 200,000 charging ports as of March 2025. Similarly, Canada has seen substantial growth, boasting 33,767 public charging ports across 12,955 stations as of March 1, 2025.

Despite the rapid expansion, concerns about charger reliability persist. Recent studies have highlighted significant challenges in the reliability and accuracy of public EV charging stations, raising concerns about billing transparency and compliance. Research indicates that 26% of public chargers fail to function as expected, and up to 45% of DC fast chargers have been reported as nonfunctional or broken, leading to failed charging sessions and potential billing discrepancies.

Additionally, the state of California estimates that over 15% of all public chargers are not accurately billing customers for energy disbursed. Despite the existence of NIST Handbook 44 and state-level compliance requirements, a large percentage of chargers remain uncertified, leaving consumers vulnerable to overbilling and operators exposed to regulatory risks.

These widespread functionality and compliance gaps emphasize the urgent need for standardized accuracy testing to ensure fair pricing, maintain consumer trust, and support the continued expansion of EV infrastructure.

Accurate energy measurement is not just a regulatory requirement but a cornerstone of consumer confidence. Overbilling due to inaccurate chargers can lead to financial discrepancies and deter EV adoption. Conversely, underbilling affects the revenue streams of charging service providers, impacting the sustainability of the charging network.

With a legacy dating back to 1904, TESCO® (The Eastern Specialty Company) has been at the forefront of metering accuracy and testing solutions. Our Electric Vehicle Supply Equipment (EVSE) testing products are designed to ensure that charging stations operate within the stringent accuracy parameters set by NIST HB 44.

As the EV landscape evolves, it is imperative for utilities, charging network operators, and regulatory bodies to prioritize the accuracy and reliability of charging stations. TESCO® is committed to supporting this mission by providing state-of-the-art testing solutions that uphold the integrity of EV charging infrastructure.

TESCO® delivers effective solutions that exceed our customer's expectations for quality and service and is committed to continually improve the effectiveness of our quality system. TESCO® has been the trusted source for meter testing instruments and accessories since 1904. Today, these products combined with engineered solutions such as ultrasonic cleaning systems, statistical sampling process development & supporting software, and technical support for preparing proposals and reports for regulating agencies and Public Utility Commissions (PUCs) for both electrical and gas metering operations, help make TESCO® the preferred supplier for utilities worldwide. TESCO®'s services include Meter Shop Layout, Statistical Sampling, Equipment Specifications, Field Services, Facility Relocation, Quality Systems, Project Management, and Custom Equipment.

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