I do many tests, now it's the details:

The bug keeps until the last alpha release(0.11.13)

There should be two type of accumulators, one with priority as "terciary" and another with "primary-output"

when the primary-output one is producing power and terciary is consuming, the bug comes.

the ...

I'm not sure but output_flow_limit of accumulator seems doesn't take effect in 0.11.7

I'v wrote a accumulator in my mod, whose output_flow_limit was set to 10kW. But it can output 15kW+ sometimes.

It works well on stable version(0.10.12)

onEntityClicked is very useful for me too.

In a fusion reactor, water will be used repeatly, not just discharged to air. So fusion reactor can use less water for much more power.

But this is very hard to emulate in game, so I think the simplest way is just let some building "generate" power.

There's a new problem for me.

`onbuiltentity` event will not be invoked if a entity was built by a robot.

Any idea about it?

Thanks for reply.
I posted my final solution on the post you suggested.
But I think it will be much better if there's some way to define a custom entity type.

I'm working on my mod at:
https://github.com/tdzl2003/PTech

You can have a look on my code.

I've tried the same thing. Here's my idea:

you can use an "accumulator" instead of a "solar panel".

It's important because you can save energy with an accumulator, but not with a solar panel.

I'd try this, and it works very well:

energy_source =
{
type = "electric",
buffer_capacity = "50kJ ...

Currently there is only one generator in game: steam-engine.
It requires heated water as input.

Is there any way to build a generator without water? like fusion-reactor or wind-generator.

There is fusion-reactor for equipment. But I don't know how to use it as a entity.

Changes:
Changed the prioritization of resupplying source of logistic robots. Provider has biggest priority, then storage and the last one is passive provider. This is to avoid uncontrolled filling of storage chests from the leftovers.

I don't think this works properly. I have mining drill with ...

besides, I opened the mod "trailer" by accident, maybe this effects.

I met this problem when trying save a game from custom map.
I'm pretty sure both the map and the game was created in 0.10.0