Being one of the fast emerging Internet of Things (IoT) technologies, low power wide area networks (LPWANs) offer power-efficient, long range and low bit rate communication for the machine to machine (M2M) and other IoT use cases. Long Range (LoRa), a prominent LPWAN technology, utilizes the unlicensed Industrial Scientific and Medical (ISM) band, which is already getting crowded because of dense deployments of Wireless Local Area Network (WLAN), Low Rate Wireless Personal Area Network (LR-WPAN) and other applications. To avoid channel congestion in LoRa networks, the use of TV white spaces (TVWS) is a promising solution. This paper presents a new path loss model for LoRa based communication using TVWS for outdoor applications. We studied and evaluated energy consumption and uplink delivery rate for a number of end devices, gateways, and coverage at TVWS frequencies. The proposed model reduces path loss and energy consumption at the TVWS frequencies by 4% and 18%, respectively, compared to the existing techniques. The results also show an improvement in uplink delivery rate by 4%, 19% and 25% for different scenarios with varying area radius, number of gateways and end devices, respectively. © 2023, The Author(s), under exclusive licence to Bharati Vidyapeeth's Institute of Computer Applications and Management.