TechCapsules

CleanTechnica Interview with Bill McKibben

At the Hawaii Sustainability Expo, CleanTechnica’s Scott Cooney interviewed environmental leader Bill McKibben, discussing global shifts from fossil fuels, emerging technologies, and Hawaii’s energy future. The conversation also explored McKibben’s views on the coming energy landscape and his personal philosophy. The session, described as a “talk story” session, focused on deep, personal insights rather than policy or politics.

💡 McKibben’s influence on environmental thought and action is profound, and his perspective offers a rare, personal look into how sustainability leaders see the evolving energy transition. His insights could help shape how communities like Hawaii approach their energy decisions in the coming years.

California School District Jumps Into Solar, Storage, & Electric Buses

The Porterville Unified School District in California’s Central Valley is installing a 763 kW solar array on existing parking‑lot shade structures, a 408 kW/1,632 kWh battery storage system and a microgrid controller that can isolate the campus from Southern California Edison when needed. The energy hub will feed 35 DC fast‑charging ports for a planned fleet of electric school buses and eight additional chargers for district vehicles, two of which support bidirectional vehicle‑to‑grid (V2G) operation. Partnering with ForeFront Power for generation and storage and The Mobility House for charge management, the project is funded by a U.S. EPA Clean School Bus grant and assistance from nonprofit CALSTART. Upon completion, the 1,171 kW system is projected to generate about 1.425 million kWh annually, offset roughly 80 % of the district’s electricity use and avoid 21,000 metric tons of CO₂ over 30 years, while bolstering resilience during power‑shutoff events.

💡 By coupling solar, storage and V2G, the district creates a self‑sustaining microgrid that safeguards essential school transportation and reduces hazardous emissions for a community plagued by poor air quality.

Startup testing nuclear battery technology in orbit

A Florida startup, City Labs, launched the BOHR cubesat on SpaceX’s Transporter‑17 rideshare on July 7, marking the first commercial in‑orbit test of its NanoTritium betavoltaic power system. The device uses tritium decay to generate microwatts of electricity, intended to keep low‑power payloads running for years without sunlight. While the satellite bus still relies on solar panels, the betavoltaic unit powers the experimental payload, demonstrating a safe, low‑radiation nuclear source approved under the FAA’s new radioactive‑material launch framework. The mission, funded in part by NASA and Pentagon contracts, seeks to validate the technology for future deep‑space, lunar‑shadow, and contested‑environment missions. City Labs plans a tritium‑based heater unit test in 2027 and aims to commercialize long‑duration micro‑power solutions.

💡 It proves a regulatory pathway for commercial nuclear micro‑power in space, opening markets for missions where solar energy is impractical.

State of health: The critical metric for measuring battery ageing and performance,…

State of health (SoH) is a percentage measure of remaining charge capacity in battery cells compared with their original rating, and it is a core metric for operating and managing grid‑scale battery energy storage systems (BESS). SoH declines as cyclic and calendar ageing reduce capacity, raising internal resistance and limiting current delivery. The battery management system predicts degradation, linking SoH to state of charge (SoC) and safety risks such as thermal runaway. Operators monitor SoH to schedule cell replacements, avoid costly fires, and optimise operational expenditures. Factors that accelerate SoH loss include high charge‑discharge rates, elevated temperatures, deep cycles and inefficient BMS control. Understanding true SoH therefore enables longer‑lasting, safer, and more cost‑effective BESS deployments across diverse renewable integration projects.

💡 Accurate SoH data lets operators intervene before a cell failure cascades into a plant‑wide outage, turning a maintenance cost into a predictable expense.

US-based BESS companies Peak Energy, ESS Inc and Unigrid aim to commercialise…

US‑based battery‑energy‑storage firms Peak Energy, ESS Inc. and Unigrid announced plans to commercialise sodium‑ion (Na‑ion) batteries in the United States. Peak will open a Sacramento, California plant that can produce up to 4 GWh of Na‑ion BESS annually, backed by a multi‑million‑dollar investment and creating hundreds of local jobs. The company describes the system as a 20‑year‑life, maintenance‑free grid‑scale storage unit. Na‑ion technology is highlighted for its lower fire risk, ability to discharge to 0 V, wider temperature tolerance and reliance on abundant sodium instead of geopolitically sensitive lithium. Analysts forecast Na‑ion storage demand to reach hundreds of gigawatt‑hours by the late 2020s, putting the three firms in direct

Australian fuel giant suggests it may eventually phase out petrol

Ampol CEO Matt Halliday indicated that refining and selling petrol may eventually be phased out in Australia as profitability declines amid rising electric vehicle adoption. Halliday told ABC’s That’s Business with Alan Kohler that while diesel and jet fuel remain critical for national security, petrol production is becoming less economically viable. Australia currently relies on just two operational refineries, producing only 20 percent of domestic fuel needs, with supply chains strained by Middle East conflicts. EV market share surged to 23.3 percent in June, while petrol vehicle sales dropped nearly 30 percent. Although Ampol’s charging network offers revenue potential, Halliday noted it may not yet match petrol profits. The shift highlights a strategic challenge: adjusting production toward diesel and jet fuel while managing the logistical costs of exporting excess petrol. This transition reflects broader economic pressures from high fuel prices impacting transport and essential goods across the nation.

💡 Australia’s reliance on just two refineries creates a fragile energy infrastructure that cannot easily pivot away from petrol without significant logistical costs. This structural vulnerability forces a difficult choice between maintaining national fuel security for diesel and jet fuel while accepting the economic obsolescence of domestic petrol refining.