Study Shows 100% Renewable Grid by 2050 Feasible with 15–20 TW Wind/Solar and Over 9 Million Hectares of Solar

TL;DR: A new model shows a fully renewable global electricity system by 2050 is technically possible, requiring 15–20 terawatts of wind and solar power and more than 9 million hectares of solar panels. The study, published in Nature Energy by researchers at Tsinghua University, outlines how land use, transmission, and policy can shape the transition.

Researchers built a spatio‑temporally resolved global power system model that simulates hourly demand for every region over a year at a 0.25‑degree resolution. They co‑optimized where to place wind and solar capacity and how to operate the grid, then tested whether the resulting system could meet decent living standards worldwide. The model also evaluated land availability, proximity to load centers, and cost‑saving measures such as demand‑side management, expanded cross‑border transmission, and removal of renewable‑energy trade barriers.

The analysis finds that net‑zero power systems meeting universal electricity needs would need 15–20 terawatts of variable renewable energy (VRE). Supplying that amount with solar photovoltaics alone would require over 9 million hectares of land—roughly the size of Portugal. More than 80 % of the VRE capacity would sit within 200 kilometers of where electricity is used, reducing transmission losses. The model estimates that demand‑side management could cut system costs by 6.5 percent, saving about $182 billion per year; expanding international transmission could save 5.6 percent (~$157 billion/yr); and removing trade barriers could save 12.2 percent (~$345 billion/yr).

The results indicate that a 100 % renewable grid is not limited by technology but by how societies allocate land, build transmission links, and shape trade policies. Regions with high solar potential, especially parts of Africa, could gain affordable electricity and climate‑justice benefits if land‑use planning and international cooperation are prioritized. Policymakers should weigh land‑use trade‑offs while investing in grid interconnectivity and reducing tariffs on renewable equipment.

Watch for upcoming international agreements on cross‑border transmission financing and land‑use incentives that could determine whether the 2050 renewable target moves from model to reality.