6 Semifluid Generators burning Biogas: 16 EU/t; 32k internal storage.
With 0 Upgrades: Outputs 16x6 EU/t. If energy isn't needed for a tick, then it is dumped into the buffer and held until the fuel runs out and a power draw is detected. It then outputs 16EU/t to that power draw.
With 1 Upgrade: Outputs 32x6 EU/t for 2000 ticks, then outputs 16x6 EU/t.
With more upgrades , you can do the math and figure it out.