Welcome to Horse-trailer, where the energy companies can root your boot however they like.
Peak is 47.7c/kWh curently when 'smart' meters are installed, overall this seems to average to about 25c/kWh. This is about to increase another 1.5% next month. If offline storage was cheap it would make sense to pull power during off-peak (at 11c/kWh) and use it during peak times.
Gas prices are also being increased significantly, next month by around 8.5%.
Are the electric companies private entities, public, or a mix?
In my state prior to 2002 we had only 1 or 2 private power companies (aside from some cities that had their own plant) and they were regional. The state strictly controlled power pricing. This was called "regulated" After 2002 the big companies were split into smaller units such as generation and distribution and had to sell power to competing companies and could also buy power from the competing companies.
The state now sets what is called "the price to beat" which is sort of a suggested retail price and competing companies try to sell you on beating that price.
After the industry was deregulated, property owners now own the meter and box on the house. Prior to that they were owned by the power company. The downside is if you have a problem with your meter or wiring outside the house, you have to hire someone to fix it for you rather than have it done for free by the power company.
If you have enough money you can purchase your own electric substation for about $5,000,000 and save significantly on your bill. My former employer purchased one and apparently it paid for itself within the first year. These substations step down the 150KV coming from the overhead lines to about 14KV and then further down to the various standards in between such as 110, 220, 240, 480, etc.
So with all of this companies can even say you pay xx cents per KWh and we guarantee 25% of it is based on wind or some other "green" technology. Where your actual power comes from doesn't really change, but your basically making the company buy or generate a certain percentage of power using a "green" technology on your behalf.
Some companies let you pick percentage from none all the way to 100%