There are experts within the Kibera community who can set your house with water and electricity. They make "illegal" connections from the main power lines so that somebody else pays for your electricity usage. In return, you pay the expert 400 Ksh ($5) per month. Variable to fixed price. 

The same applies to water access - the main pipes are exposed throughout Kibera, and we saw a lot of water leakage that was used as "access points"