Solar
Qinghai Leads China's Clean Energy Transition with World's Largest Solar Park
Qinghai leads China's clean energy transition with 45GW+ renewable capacity, world's largest solar park, and innovative hydro-solar integration systems.
Solar
Sustainability
Off-Grid Solar Homesteading Costs in 2026: System Economics, Battery Chemistry, and Risk Across 3, 6, and 12-Person Households
Off-grid solar costs at three household scales, with DIY versus professional pathways, LFP versus lead-acid economics, and a full risk analysis.
Maritime
Container Ships as Mobile BESS: How Solar Cargo Roofs and Sodium-Ion Batteries Could Electrify Ports
A 90–100 MWh shipboard BESS paired with solar container roofs could support port charging, shore power, and grid resilience.
DIY
Off-Grid ESP32 Flood-Stage Sensor: Cutting Standby From 20 mA to Under 100 µA on a $70 Solar Node
Full open-hardware build: ultrasonic stage sensing, LiFePO4 pack, and the dev-board parasitic draw that wastes 89% of a node's daily energy.
Communications
Airbus Zephyr HAPS: AALTO, 67-Day Endurance Record, NTT DOCOMO, and the Stratospheric ISR Market Assessment
The Zephyr is a solar drone that flies at 70,000 feet for months at a time. Here is what it does, who operates it, and whether it will reach market.
Smart City
Perovskite-Silicon Tandem Cells and the Economic Viability of Building-Integrated Photovoltaics: A Strategic Technology Assessment
Perovskite-silicon tandem solar is entering BIPV markets, but cost, lifetime (T80), and policy will determine real adoption.