Variable Rate: With a variable rate, you stand closer to the fire. Rather than keep your costs separate from market conditions, you experience the rise and fall of price alongside your provider. You profit when supply exceeds demand, but could pay through the nose if the electricity grid becomes overtaxed. That usually means a higher bill in the summer and winter (when demand is at its highest) and a lower one in the fall and spring. A variable rate plan is best for people interested in staying on top of market changes – when prices get too exorbitant, there’s no contract and no cancellation fee if you want to try a new provider.
Residential and business consumers in deregulated energy markets have the power to choose their energy supplier. The power to choose gives consumers the opportunity to compare suppliers and find energy plans that satisfy their usage needs and budget requirements. Whether in a deregulated city in Texas, New York, Ohio or another state, you can shop for electricity or natural gas and find the best plan for you!
As you shop, you’ll see the rates advertised in terms of kilowatts per hour (kWh) — the energy used to power 1,000 watts for one hour. According to the U.S. Energy Information Administration, the average price per kWh for electricity in Pennsylvania is 14.52 cents, while the Public Utility Commission's “price to compare” currently hovers around 8.0 cents. Clearly, there’s a lot of price variety out there. And, given the hundreds of providers doing business in Pennsylvania, exploring electricity options can be pretty toilsome.
The mid to late 1880s saw the introduction of alternating current (AC) systems in Europe and the U.S. AC power had an advantage in that transformers, installed at power stations, could be used to raise the voltage from the generators, and transformers at local substations could reduce voltage to supply loads. Increasing the voltage reduced the current in the transmission and distribution lines and hence the size of conductors and distribution losses. This made it more economical to distribute power over long distances. Generators (such as hydroelectric sites) could be located far from the loads. AC and DC competed for a while, during a period called the War of Currents. The DC system was able to claim slightly greater safety, but this difference was not great enough to overwhelm the enormous technical and economic advantages of alternating current which eventually won out.[1]

Usually, fixed-rate renewable-energy plans are among the most expensive options. But in our research, we found Constellation’s green plan rates were comparable to its non-green versions. For example, out of two otherwise identical fixed-rate, 12-month plans from Constellation — “12 Month Fixed Rate 100% Green” and “12 Month Fixed Rate” — it’s the renewable version that currently costs less.
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Start with one of our three standard packages and add on equipment as you see fit. Basic packages start with door and window sensors, motion detectors and our touch-screen controller. The controller's signal cannot be cut, even if the panel is damaged, and its always-on cellular connection keeps the software up-to-date without you having to do a thing. From there, you can add on more security gear, including a doorbell camera you can monitor from your phone, a smart thermostat, smart lights you can program to turn on and off, a carbon monoxide detector or any number of features and locks to make your home as secure as you want it to be. 
Just as impressive: Its overall J.D. Power score for customer satisfaction. The 1,000 point score considers price, communications, corporate citizenship, enrollment and renewal, and customer service. At 709, Green Mountain Energy scored the highest of all Pennsylvania companies, well above the 669 state average, and a solid 20 points ahead of the next closest provider we looked at — Constellation.
Over a year, you could save nearly $100 by choosing the green plan. But it’s important to note that Constellation’s attractive initial rates will very likely not be around for a second year. According to the customer reviews on Consumer Affairs, this new contract usually jacks up the price. It offers great rates for new customers, but it may not be worth it to stick with them for more than an initial contract.
Since the 1990s, many regions have opened up the generation and distribution of electric power to provide a more competitive electricity market. While such markets can be abusively manipulated with consequent adverse price and reliability impact to consumers, generally competitive production of electrical energy leads to worthwhile improvements in efficiency. However, transmission and distribution are harder problems since returns on investment are not as easy to find.
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