A typical wind turbine is 80m high and and generates 1.5MW [1].
Gravitational storage in Joules is (mass in kg) * (height in m) * 9.8 (gravity).
Divide by 3.6 million to convert to kWh.<p>Suppose we raise a 30-ton weight (i.e. a big shipping container filled to capacity with rocks) all the way up that 80m turbine.
We&#x27;ve stored 30,000 * 80 * 9.8 &#x2F; 3600000 = 6.5 kWh of energy.<p>That&#x27;s <i>16 seconds</i> worth of energy from the turbine spinning at full speed.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Wind_turbine#Design_and_construction" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Wind_turbine#Design_and_constr...</a>