No Robbie, in most of what I've listed, the flywheel captures and stores waste energy and allows it to be used. The storage time depends on the application needs. The vacuum enclosed flywheel referenced utilizing magnetic field bearings can store the energy for at least hours.

Robbie, can you read? Do you just want to fight?

You could build a small proof-of-concept, H, to see it it works. The vacuum containment would have to displace more than its weight in air without imploding.

They are also used in inertial guidance systems due to the stability of rotating mass.

Flywheels as temporary energy storage is exactly right. Applications vary from regenerative braking, smoothing power transfer to load, etc. The largest I've seen was 20ft diameter, I've seen them in vacuum at very high rpm's, locomotive's, ore hoisting from deep mining (clutched and un-clutched), the venerable Woodward Governor as speed control and overspeed switch. and even some old water driven mills.

Applying excess heat to building heating and hot water needs could help a lot.

It's been a dream of mine for several years to see the development of independent power generation for the home. The losses in transmission of electrical power and the grid system of most developed countries and the cost of maintaining rotation of generators and the lock of utilities on users has always driven me nuts.

The combination of super capacitors and a decent generation or combination for the individual could solve so many difficulties, (besides that all those damn poles and drooping wires are ugly). I'm not sure that I like their proposed business model of leasing the equipment as the best or most economical solution for the individual, but… You're just not going to be able to get government and bureaucracy out of your home through the lease and mini-grid grouping system.

But to the Stirling used to drive a generator, that's been done successfully since the 30's and mainly applied to waste heat utilization and lately to solar concentrators (mirrors). Kamen must think he's improved the efficiency to a point greater than 50% or is just looking at taking the advantage of the increased availability of Natural Gas. I suspect the latter.

Actually the whole purpose of a flywheel is energy storage. From Wikipedia on the uses of flywheels

Providing continuous energy when the energy source is discontinuous. For example, flywheels are used in reciprocating engines because the energy source, torque from the engine, is intermittent.
Delivering energy at rates beyond the ability of a continuous energy source. This is achieved by collecting energy in the flywheel over time and then releasing the energy quickly, at rates that exceed the abilities of the energy source.
Controlling the orientation of a mechanical system. In such applications, the angular momentum of a flywheel is purposely transferred to a load when energy is transferred to or from the flywheel.

there are lots of engineers in this site who would have great input on this question. hopefully they'll see and comment on the post.

Based on my memory you are right Sterling Engines do not deal well with changes in required power. Of course this why old engines were commonly attached to a fly wheel. I believe their have been some advances in flywheels based on new powerful magnets.

There are probably several people, including J and OA, who know more about this area than me.

Good to see the Stirling engine as a salable product.

. 'they can’t change power output quickly. '
This invalidates the claim to useful round-the-clock power unless you have a source of variable power generation as well.
That is. if you have a 10kW generator and need 10kW- fine,
but when the requirement drops the rate of fuel consumption is the same, the generator will then get hotter. This may not matter if fuel is very cheap and there is a good cooling system. I like it, but same as for other interesting generators it needs a cheap method to store energy so I do not see mass adoption soon.
What's dbh's opinion?

ok, yes. I wanted full disclosure...

I thought you would enjoy my little poke at fun.

good point irrelevant. I certainly don't think he is a fraud...but only market and other influences will tell on this one. I know my current generator is frustrating...and damned loud

Kamen says in 10 years few people will be dependent on grid power. Is that because there is a better solution, or because the economy and the grid is going to collapse?
He said the Segway would revolutionize transportation, too.

do not let that stop you. maybe your's works differently. maybe it's fun for the reader to see one in literary action...you're not trying to jules verne everything are you?