The Times of London thinks so.
It's an appealing idea: The NGO SolarAid has organized a program to bring solar panels and bulbs to Kibera, a community where most people have no electricity, and those that do have illegal hookups that short out regularly and barely power a feeble bulb.
A few caveats and thoughts:
1. cost: "the panels and attachments were sourced in Switzerland, where a well-wisher subsidised them to bring the price down."
2. Though it's not clear whether this is with the subsidy or without, "they cost about 2,500 shillings," which, according to the article, is the cost of about five months worth of kerosene. That works out to be $33, which is a huge amount for most people in Kibera. After all, Josephine Anangwe, the mother who is mentioned at the beginning of the article, survives on her husband's 750 shillings-a-week salary. So it would take
3. Though I have no idea if this is true, one commenter pointed out that kerosene fumes, though toxic, serve as a mosquito repellent and thus help reduce the prevalence of malaria & dengue and other insect-borne ailments.
4. A communal charger--perhaps available at a church or through a merry-go-round (a group of women who pool money)--might be a way to bring down the cost for a family.