The cost per kWh is very variable and depends on your individual situation and your electric utility. The two points I'd make is that the cost of a kWh for charging the Volt is your average cost per kWh, and, if you install solar, the cost per kWh depends on how much it cost to install the solar system. For this calculation I'd take the cost after all rebates and credits, toss in the cost of another inverter, and depreciate the system over 20 years.
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In reality it's not so simple because people are forever confusing "How much did my bill go up?" with "How much does it cost to charge my Volt?". These are entirely different questions and I was just pointing that (a) it's best to understand the distinctions and that (b) the answer to the first is not the answer to the second.the answer to his "how much did my bill go up" its going to be VoltKWHUsed * Tier4CostPerKWH. Simple as that. VoltKWHUsed * AvgKWHCost is totally the incorrect answer for what he was solving for.
More or less the same for the solar. Electricity generated by your solar system is not "free". In fact it may or may not cost him more to charge the Volt after getting solar. You'd have to compare the AVERAGE cost per kWh before and after the solar to know. Part of that computation is deriving the cost per kWh of electricity generated by the solar system.
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