Gareth Hutchens

There's this massive spike in the middle of the day.

We have too much, so much so that in the middle of the day, a lot of coal-fired power stations are paying when they send electricity into the grid.

They're paying a penalty because there's so much juice around.

What batteries are doing is moving that excess, smoothing out the picture so that we have a more stable grid.

And as we're getting this time,

at cheaper prices in most of Australia.

To wrap up, something fascinating from this week has been the exit of Mexican food chain Guzman and Gomez from the US.

You've got to admire an Australian chain taking on the US, such a massive market in fast food, the chutzpah of launching a Mexican chain.

Like I admire it.

Maybe it was never going to work.

Investors are delighted that they've stopped.

But it doesn't appear to have stemmed the bleeding of losses of money that they're spending over there, Gareth.

They had about 300 staff in eight locations around Chicago.

They tried really hard.

In fact, the co-founder was there for the last three months trying to make it work.

Is there a flip side in the fact that the American chain Taco Bell, which sells Mexican food, has had three goes at Australia, is currently in its third iteration, and the best it's got out to at the moment is 20 stores having already – in fact, it was going to be the third and done, but someone rescued it right at the end –

Is it just really hard to break a new market?

Starbucks famously got out to about 120 stores in Australia, retreated to about 15 largely in airports or in extremely high tourist traffic areas like Sydney's Pitt Street and Circular Quay and that kind of thing.

They have in recent years expanded out because they've worked out Australia.

Now you'll find Starbucks in the outer suburbs largely as drive-through locations.