I get calls all the time (so much for Do Not Call) from companies that want to put solar panels on my roof at their expense and charge me for the power that I would use, at lower rates than the local electric utility charges. But I live 2 miles from the beach and don't have air conditioning, so I interrupt their sales pitch and point out that my monthly electric bill is only around $30, much less than their minimum of $100 or more. They go away immediately.