If you want to be safe, dump it in a private fleet bank, or buy up a load of assets before it expires. EC Cap raise is the one thing I would urge even the most tight-fisted F2P player to purchase.
That's quite the paradox, how could you nerf nerf when the nerf is nerfed. But how would the nerf be nerfed when the nerf is nerfed? This allows the nerf not to be nerfed since the nerf is nerfed? But if the nerf isn't nerfed, it could still nerf nerfs. But as soon as the nerf is nerfed, the nerf power is lost. So paradoxally it the nerf nerf lost its nerf, while it's still nerfed, which cannot be because the nerf was unable to nerf.
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That said: Several players who have gone from gold to silver, have reported it to not be like this, and have in fact lost the EC... Just a warning.
Dump the amount in a fleet or account bank, then go back to silver and buy the cap again.
I call it, the Stoutes paradox.