energy cost

I went over my invoices and made a little table of my invoiced consumption for a given year.

electricity

 Invoice dates differ from year to year but it gives a good idea. I have no synchronized data for solar, I added 1200kWh.just to have an estimation of the total consumption.

year	peak	off-peak	total	total + solar
1998	1073	1050	2123
1999	1464	1350	2814
2000	1712	1405	3117
2001	2173	1570	3743
2002	2818	1994	4812
2003	2417	1748	4165
2004	2800	2103	4903
2005	2519	1984	4503
2006	2912	2336	5248
2007	1335	2189	3524
2008	371	2659	3030	4230
2009	224	1836	2060	3260
2010	165	1854	2019	3219
2011	147	1257	1404	2604

The yellow lines are what I pay for, most of it is off-peak power.

The solar part is an estimation.

gas

I did the same for gas. Meter readings in cubic meters.
Avg temp is average year temperature, last column is number of days max temperature was below zero.

year	gas in cu m	avg temp	days MAX < 0°
1998	1275	14	6
1999	1725	14,6	0
2000	1741	14,5	1
2001	1913	14,2	3
2002	1907	14,7	4
2003	1840	15,1	7
2004	1852	14,3	3
2005	1797	14,8	7
2006	2521	15,3	2
2007	1811	15,3	1
2008	2132	14,6	0
2009	2057	15	9
2010	2134	13,4	27
2011	1922

As of 2008 I have an extra 30 sq meters to heat.

There is a useful statistics here (in dutch).

total energy

I converted the gas volume to kWh and plotted the total consumption.