If you are interested, have the scientific knowledge and the
mental aptitude to keep up, you can try reading the link to the
article from the British Medical Journal posted below. I have
extracted some relevant pertinent information. 
Results
Compared with those who lived >
600 m from a line at
birth, children who lived within 200
m had a relative risk of
leukaemia of 1.69 (95% confidence
interval 1.13 to 2.53); those
born between 200 and 600 m had a
relative risk of 1.23 (1.02 to
1.49). There was a significant
(P < 0.01) trend in risk in relation
to the reciprocal of distance from
the line. No excess risk in
relation to proximity to lines was
found for other childhood
cancers.
Conclusions
There is an association between
childhood
leukaemia and proximity of home
address at birth to high
voltage power lines, and the apparent
risk extends to a greater
distance than would have been
expected from previous studies.
About 4% of children in England and
Wales live within 600 m
of high voltage lines at birth. If
the association is causal, about
1% of childhood leukaemia in
England and Wales would be
attributable to these lines, though
this estimate has considerable
statistical uncertainty. There is
no accepted biological
mechanism to explain the
epidemiological results; indeed, the
relation may be due to chance or
confounding.
-
Childhood cancer in
relation to distance from high voltage power lines in England and
Wales: a case-control study