Cityville new dam Upgrades.

Whack” your Dam 15 times to finish the building process need to be at least level 50 to receive this new source of hydroelectric power.

Routinely supply the Dam – every 48 hours – and keep it boosted energy cap, or else you’ll lose your bonus.

If you’re a daily active player, once you reach the current new maximum of 42 energy points, if you continue to resupply the Dam (as often as every 12 hours), you’ll simply maintain the boosted cap. Unfortunately, it won’t increase any higher than 42 (In my case).