Gravity Block Energy Storage (2D)

This 2D cross-section models the same solid-mass gravity storage physics as the 3D crane-tower simulator: surplus grid electricity lifts a heavy block up a tower on a winch cable, and lowering it back down drives a generator that returns electricity to the grid. The engine tracks motor-up efficiency and generator-down efficiency separately, so the round-trip efficiency shown live is genuinely the product of two independent conversion losses rather than a single dial — and a running tally of every joule in and out across a full charge/discharge cycle lets you verify that product against the actual measured energy balance.