Gregory Tayi
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African Dream - Rwanda's Gregory Tayi

11 November 2011 Last updated at 16:50 GMT

One of the business ventures that African entrepreneurs tend to avoid - perhaps in order to avoid a shock - is electricity.

It can be a highly capital-intensive enterprise, very risky, and the returns may not be felt for a long while.

But Rwanda's Gregory Tayi saw that as an opportunity.

He told the BBC's African Dream series how he set up the first private mini hydro-electric power station in the hilly east African country.

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