Honest projection · estimated
Solar Energy Striking Earth Today
A running tally of how much solar energy has struck the Earth since midnight UTC — and unlike every other projection here, this one is not an estimate but a physical constant. Our planet intercepts about 173,000 terawatts of sunlight continuously, more than ten thousand times all human energy use combined. In a single day the Earth receives more energy from the Sun than humanity uses in a year. About thirty percent is reflected straight back to space; the rest drives the weather, the oceans and life itself. The figure shown is the energy arriving at the top of the atmosphere.
About this number
This is an honest projection, not a census. It is computed by carrying a published figure forward at a known rate over real elapsed time — ≈ 48m MWh/sec (≈4.15 trillion MWh/day), from The solar constant — Earth intercepts about 173,000 terawatts of solar power continuously, integrated over the day. The source is Solar constant (Earth’s energy budget) — ~173,000 TW. The true value is known only to within a margin; this is the running estimate, and we label it as one.