Only if you know the amount of electricity consumed in your home you can estimate the amount of electricity 'saved'. Of course you are not really saving energy but replacing utility-generated electricity with your own supergreen solar-generated electricity. All kinds of variables determine the outcome. Among these are: the number of solar panels and whether their orientation to the sun is best or second best, your energy behavior and.... sunshine. On this page I have documented my household's need of utility electricity before and after the installation of solar panels. This is only an indication, no more, no less. In the 2002 days, six 95 Wp solar panels did their work on the roof of my home (currently the total is 2.4 kWp). My solar panels managed in 2005 to reduce my dependency on utility-generated electricity with 65%.

Electricity consumed in my home: pre-PV age versus 2002 (first 6 panels) and 2005 (14 panels) (kWh)

	pre-PV age (2001)	2002: 6 PV panels, 570 Wp)	'saved' in 2002 compared with pre-PV	2005: 14 PV panels, 2440 Wp	'saved' in 2005 compared with pre-PV
january	240	254	-15	193	43
february	219	196	23	131	88
march	218	229	-9	109	109
april	190	144	46	19	171
may	194	115	79	-27	221
june	170	110	60	-103	273
july	184	137	47	-18	202
august	172	114	58	-17	189
september	196	149	50	29	167
october	233	203	30	122	111
november	212	215	0	195	17
december	244	242	2	227	17
total	2472	2108	371	860	1608