A few notes.
I replaced 3 20W flourescent tubes with low power long life versions. went from 18W to 12W per unit. The 7W per unit savings have added up over the year of running to more than saving the cost of the lamps. Lifetime is good for them as well, as they are a good brand, Phillips, and made in a good plant in Poland. Good savings on a lamp on for 24/7 in a dark stairwell.
With LED lamps as well look at the lumen ratings, the power savings may not be as good as you think, as often the lower power use comes with a lower lumen output. In a lamp used in a kitchen you leave on for a few hours at a time you probably will be better off using a flourescent lamp with long life. The Phillips power saving lamps are under $10 each with the electronic starter ( they come as a pair) and are a good lamp for lights that are on for long periods but where you need a long life and a high light output with good distribution. LED's are getting there, but are not there yet for home use. Road use they are there, but there are no power savings over the regular lamp, and they do not have the life of a good quality MV lamp, which could do 20 years of burning with only a 50% lumen degredation and a 10% failure rate. Those that I have seen installed by me lasted 3 years before they were changed out, with a 30% failure rate, and 10% failure within a year. All failures caused by heat in the ballast units, the lamp modules themselves probably are mostly working.
As to the other points, the looking at the usage patterns and looking at lifestyle changes is very important. small changes, like the better insulation of the water cylinder, and insulating of piping from it along with using less water for showering helps a lot with this.
The solar water heater is a very good thing, though I will warn you against heat pumps, as in my opinion they are not good, running the refrigerant and oils at a high temperature where it is going to break down with time and create acid that destroys the unit from the inside. I have seen many, but am not impressed by them, you have a saving of around 50%, but a very expensive system to maintain, and they will possibly make 5 years in areas where there is little corrosion, at the coast they will suffer badly from fin rot in a few years. I change enough airconditioners for corroded coils for that to be a common thing. Some brands are better at protecting the coils than others, some have lasted 20 years and are still going strong, while others have rotted to bare piping in under 3 years ( 2 year warranty on the unit, 5 on the compressor) so you will get what you pay for there. But then again a pressurised water cylinder will do at most 10 years before failing, I have some unpressurised units that are my age and still going strong, with only having had elements fail over the years.
