More Efficient Twizy, Windmill and Solar Panel EDIT 3/06/10 : Info About Ambitions

EDIT 3/06/10: Just tested the mod with ambitions installed. Good news is that the expansion pack hasn't broken them, so there is no need to update!
Offtopic: However I did notice that a sim with the eco-friendly trait gets a negative moodlet from using the Twizy (a car which supposedly has no carbon emissions) and no moodlet for having a solar panel/windmill. If I had a greater understanding of modding I would change this. (This is vanilla game behaviour, not caused by the mod)

By having 1 Twizy, 5 Windmills and 10 Solar Panels (the max limit, as having anymore won't count) anywhere on your lot, you will save money on your bills. Buying all these for your house will cost you 28,200. However for this price you are only saving 45% (or 65% if the 'More Efficient' upgrade has been applied to the windmills/solar panels) each time you get billed. The twizy, windmill and solar panel are a one-time investment, so you will eventually make your money back on them by the amount you save in bills. However this will take many sim weeks to get back your initial investment. So I decided to edit this, and have created several flavours:

MoreEfficient - Having 1 Twizy, 5 Windmills and 10 Solar Panels on your lot will save you 70% each time you are billed, or give you no bills whatsoever if you have applied the 'More Efficient' upgrade to each windmill and solar panel (the twizy doesn't have this option).

Always100%Efficient - Having 1 Twizy, 5 Windmills and 10 Solar Panels on your lot means you get no bills whatsoever, even if the 'More Efficient' upgrade hasn't been applied to each windmill and solar panel.

1SolarPanel100%Efficient - Installing just 1 solar panel on your lot will mean you get no bills whatsoever. As the solar panel is the cheapest object out of the 3, this means you get no bills forever, for the low price of 800$.

SolarPanel40%Efficient - Having 1 solar panel on your lot will reduce your bills by 40%. Or you could place 2 and reduce your bills by 80%.

SolarPanel20%Windmill30% - 1 Solar Panel saves you 20% on bills, 30% if upgraded. 1 Windmill saves you 30% on bills, 40% if upgraded.

Be sure to install only one package file or you might upset greenpeace.

Additional Info:

This mod requires the eco pack from the sims 3 website. This pack requires the 1.11.7 (minimum) patch to function properly, making that necessary to running this mod.
As for mod conflicts, I haven't found any that conflict at the moment. However, it's quite possible this may conflict with mods that edit the mailbox and the price of bills. If you found any conflicts please tell me.

This mod will work with any expansion/stuff packs you have installed, you just need the patches below as a minimum:

Base Game: 1.11.7
WA: 2.6.11
HELS: 3.2.8
Confirmed to work with any patch of ambitions.

Additional Credits:
Peter Jones - S3PE.
Renault and The Sims Team - For giving us the eco pack containing the Twizy, Windmill and Solar Panel.