From: Marts on
Doug Jewell wrote...

> Electricity is getting dreadfully expensive. 1 kwH is 3.6MJ,

Where did you get this figure from? ie. how's it calculated?

> Given that thermal coal is currently about $105/tonne and in
> a 35% efficient power station will yield about 2300kWH of
> energy per tonne, (4.5c per kwH), I think we are getting
> overcharged quite dramatically for our electricity.

Quite so.

I take it that your figures are for black coal fired plant? If so, then consider
that the thermal rating of brown coal which we use here in Vic is probably less
than half that of black coal.


From: Doug Jewell on
Marts wrote:
> Doug Jewell wrote...
>
>> Electricity is getting dreadfully expensive. 1 kwH is 3.6MJ,
>
> Where did you get this figure from? ie. how's it calculated?
1W = 1 Joule/sec or alternatively 1 Watt.Second = 1 Joule
3,600 sec per hour.
1000W per kW
Therefore 1kWH=3,600,000J=3.6MJ
>
>> Given that thermal coal is currently about $105/tonne and in
>> a 35% efficient power station will yield about 2300kWH of
>> energy per tonne, (4.5c per kwH), I think we are getting
>> overcharged quite dramatically for our electricity.
>
> Quite so.
>
> I take it that your figures are for black coal fired plant? If so, then consider
> that the thermal rating of brown coal which we use here in Vic is probably less
> than half that of black coal.
Yes those figures were based on black coal.
I'm having a bit of trouble determining the current price
for brown coal, but this article from 2003:
http://www.theage.com.au/articles/2003/09/21/1064082865902.html?from=storyrhs
indicates that it is about 1/3rd to 1/5th the price of black
coal. It produces less energy per tonne, but is apparently
much cheaper. Black coal has obviously increased in price
significantly since 03, and I'd imagine brown coal probably
has too, but I'd expect the relationship between the costs
would stay fairly steady.
>
>


--
What is the difference between a duck?
From: Marts on
Doug Jewell wrote...

> Yes those figures were based on black coal.
> I'm having a bit of trouble determining the current price
> for brown coal, but this article from 2003:
> http://www.theage.com.au/articles/2003/09/21/1064082865902.html?from=storyrhs
> indicates that it is about 1/3rd to 1/5th the price of black
> coal. It produces less energy per tonne, but is apparently
> much cheaper. Black coal has obviously increased in price
> significantly since 03, and I'd imagine brown coal probably
> has too, but I'd expect the relationship between the costs
> would stay fairly steady.

Currently brown coal costs the generators about $5 MWHR.

And this varys between power stations which source their coal from different
mines. But not that much.




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