Is it worth the extra cents?

Electrical utilities the world over use a combination of green electricity and ‘dirty’ electricity sources, ranging from very polluting sources such as coal, to more benign ones like hydroelectric power, and finally to mostly harmless sources like wind and geothermal electrical generation.

You might think your electricity is clean and green, because your local utility claims to generate mostly from renewable sources. But electrical grids in places like North America and Europe are so interconnected, that your electricity at any given moment could be coming from the wind turbine farm a few miles down the road, or the coal-fired plant a thousand miles away, depending on the flux of supply and demand.

When we talk about Green Electricity we’re really talking about two different things, depending on the context:

  • It can be an environmentally friendly and renewable source of electrical generation, such as wind, small scale hydro, geothermal, or solar electric
  • It can be an arrangement between an electricity user and a supplier who generates or delivers clean electricity.

The point of this distinction is that, in most cases, you can’t choose where the power racing through your electrical wires comes from. So in a mixed electrical grid like the North American grid, no household can claim to be using electricity that is 100% green in the first sense above, even if they are buying 100% of their electricity from a green supplier.

Is hydroelectric power green electricity?

Power lines

Many people in countries such as Canada, which gets a lot of its electric power from hydroelectric projects, think that their energy is clean because it only takes falling water to generate it.

In fact, large scale hydroelectric projects are far from green energy. Among the negative impacts of large scale hydro generation are:

  • As the reservoir upstream of a new dam fills, flooded habitat is destroyed, including forests and species-rich wetlands.
  • Flooded vegetation decomposes, releasing CO2 and methane. Methane is a greenhouse gas about 30 times more powerful than CO2 in terms of its greenhouse effect, and because the bottom of a reservoir tends to be so oxygen-poor, reservoir decomposition tends to be anaerobic (without oxygen), in which methane, not CO2, is the main byproduct.
  • A reservoir increases the river surface area, increasing evaporation, which in turn increases the salinity of the water.
  • A reservoir alters the temperature downstream, making the river downstream warmer in winter and cooler in summer. This can wipe out species that are sensitive to temperature changes.
  • A reservoir can hold back floodwaters that would normally flow out onto a flood plain, which depends upon the nutrients and seasonal water flow provided by seasonal flooding.
  • A dam fragments the waterway upon which it is built. Fish ladders are added to most dams to allow spawning fish to swim upstream, but the dams can still prevent fish from traveling downstream, which reduces downstream populations.
  • Sediments, which before a dam help replenish riverbanks, river deltas, and other formations downstream, are trapped behind a dam, slowly filling its reservoir and reducing the reservoir’s capacity. Meanwhile, the downstream formations are eroded because of the reduced sediment flows.

Given these problems with large dams, many renewable energy experts don’t include large-scale hydro projects in their definition of green electricity. Instead, they favor a small-scale hydroelectric generation sometimes referred to as microhydro.

My family and I stayed for a month at the Durika Biological Reserve in the Talamanca mountain range in sourthern Costa Rica. This intentional community of 30-odd inhabitants and up to 25 visitors at a time, is entirely powered by one microhydro installation. The installation does not disrupt the flow of the mountain river from which it draws its power.

The Durika microhydro project consists of a small dammed area on a mountain river; most of the water flows over the top of the dam, much as it does over waterfalls both upstream and downstream. Durika hydro electric project water pipeA small portion of the water flows to one side of the dam and down a 6″ pipe. This pipe falls several hundred feet to a high-pressure microturbine. When you see the water coming out of this turbine it’s astonishing how little there is and how slowly it travels – the energy comes from the high pressure that is built up by the substantial drop in height between the water intake and the turbine. This small system causes minimal disruption to local ecosystems, yet generates 20 kilowatt hours of electricity 24 hours a day year-round.

Many green electricity suppliers insist on providing only microhydro, not large-scale hydro, in their mix of green electricity products. While the Durika installation is an example particularly suited to mountain rivers, other types of microhydro projects are used in less hilly areas, but always with the same objective: only take a portion of the river’s water, and avoid disrupting the waterflow or creating a reservoir.

Green electricity and the electric car

Electric cars, and plug-in hybrids, are gaining ever more attention these days – we see more and more Tesla’s on highways and city streets as well as Nissan Leafs, electric VWs and BMWs, several Kia Soul EV and Kia Niro EV, and many more. While it’s still better to power an electric car with coal-fired power, than to run regular cars on gas, better still is to run these electric cars on green energy.

Ways of buying green electricity

You can buy non-polluting electricity either by paying to have a green supplier generate all your electricity for you, or by a program sometimes known as a Green Tags program, where you buy blocks of green power in advance, in order to allow a green supplier to put that much electricity on the grid over a specified period.

When you sign up with a green supplier, they bill you each billing cycle either for the amount of electricity you used, or a flat amount representing the average amount of green electricity they pump into the grid for an average customer. They are responsible for making purchasing arrangements with green electricity producers to put that much electricity on the grid as a result of your using it.

When you sign up with a green tags program through your local utility, you typically purchase a block of electricity, perhaps 100 or 250 or 500 kwh. Usually you are paying only for the premium (the price difference between the green and the dirty electricity you’d otherwise get), and by adding this premium to your bill you obligate your utility to buy that much electricity from a green supplier.

When you sign up directly with a green tags program, you are simply paying that program money to reflect the fact that green electricity sells at a premium. The premium used to be because it cost more to supply clean electricity than dirty electricity, because the dirty electricity sources are artificially subsidized through allowing them to spew their carbon waste and smog into our collective breathing space, the atmosphere. But these days, green electricity is actually cheaper than many sources of dirty electricity – definitely cheaper than coal or natural gas. In any case, by buying green tags you make it more affordable for a green supplier to generate their electricity, and therefore, in theory at least, you increase the amount of green electricity on the grid.

Many utilities offer a green electricity option where they guarantee that the power you buy is 100% renewable. I believe this option is mostly ineffective at driving a move towards renewables, because it’s easy for a utility to simply take the portion of its energy mix that is renewable, and assign part of that clean portion to you, while assigning the dirty portion to customers who didn’t ask for green electricity. If you go the route of asking your regular electricity supplier for a fully renewable solution, do very thorough research to ensure that each customer who chooses this option actually results in a net increase in clean power purchases.

When looking for a green supplier, you should find answers to the following questions:

  • How green is their electricity? Do they only exclude coal and nuclear? Do they include large-scale hydro, which many don’t consider environmentally friendly?
  • Are they putting new green sources of electricity on line, or just remarketing a supply that was already being put on the grid for general consumption?
  • If they’re a utility, are they adding green energy to their mix because customers sign up for green energy, or just redistributing their current mix so the green energy goes to people willing to pay more?
  • Are they legally or contractually obligated to contribute to the grid an amount of green electricity equal to what you consume? Or are they just trying to build partnerships with green electricity generators without guaranteeing a purchase that matches what they’re selling to consumers?

My experience with green supplier Bullfrog Power

Bullfrog power

I became a customer of Bullfrog Power, a green Canadian electricity supplier, since shortly after their launch in 2005. Bullfrog Power sources its electricity generation from wind turbines and from micro hydro (water turbines that don’t require large dams or reservoirs). So Bullfrog Power is a source of green electricity. I stayed with them until I added a 7.5 kw solar power system to my home in 2016.

When I was with Bullfrog, the electricity coming out of my wall sockets wasn’t really any different than that of my neighbors. It came from the same combination of sources, such as coal, nuclear, large-scale hydro, natural gas, and truly clean electricity. But by agreeing to pay a green supplier to generate electricity on my behalf, I helped create demand for green electricity and eliminate demand for dirty electricity.

Each month, my green supplier would buy an amount of green electricity that matches the recent consumption of its customers. What houses or factories this electricity goes to is anyone’s guess, and in fact it doesn’t matter. What does matter is that consumers, by signing up with a green supplier, are helping create demand for cleaner electricity sources.

Green customers pay a premium for clean electricity. This isn’t as it should be – it should really be people who buy dirty electricity who pay a premium, to cover the added costs of the pollution they cause. The fact is that most electrical generation is artificially subsidized by the general public.

The health and environmental impacts of burning coal are paid for by everyone around the world, as problems such as acid rain, smog, and climate change get worse with every ton of coal we burn. They aren’t paid for specifically by the people using the coal-fired electricity.

But most green electricity customers recognize that, if we want to make the world a cleaner, better place, we should be willing to pay more for each kilowatt hour we buy. In my case with Bullfrog Power, we pay considerably more for each kilowatt than our neighbors who buy the conventional, dirtier mix of electricity.

Does green electricity really make a difference?

Part of the solar electric setup on my home

Many people get hung up over the fact that you can’t control what source of electricity powers your particular home, to argue that buying renewable electricity is a sham. But it really does make a difference for the better.

The fact is that by signing up with a green supplier, you are requiring that supplier to source more green electricity in order to meet your electricity consumption. And the more people sign up, the more green electricity your supplier needs to source.

I saw this with Bullfrog Power when I was a customer. Every month or two they were announcing a new agreement to buy power from a wind farm, or to help with the construction costs of a new wind turbine. As their customer base grew, they formed more and more partnerships with green suppliers, which created demand for new sources. And as these new sources came on line, less dirty power had to be generated to meet overall demand.

I’m not fully convinced that an outfit like Bullfrog Power is making a difference. I think they were when I was a customer. But around 2019 I thought I’d look at them again (even though I was generating lots of green electricity with my solar panels by then). I did some reading on their website, some Internet searches, and couldn’t really turn up any substantial projects they had invested in recently. They had been purchased by a larger energy company (Envest – mostly renewable, but some fossil gas generation), and it seemed that they had switched from signing agreements to purchase blocks of power or whole scale renewable generation facilities, to providing funding to community groups and coops interested in solar power. I didn’t get a clear sense that they were buying 1 kwh of green electricity for every kwh a customer was paying for. They had also changed their billing model – whereas I used to pay a premium per kwh on what I used, it was now just a flat monthly fee.

I called someone at Bullfrog Power and asked them for more information about how they ensure that the money consumers are paying translates into net new sources of renewable energy. I didn’t get a convincing or satisfactory answer so I decided not to renew, as I couldn’t be sure I wasn’t just giving money away to a company without producing any positive change as a result.

What does it cost?

Green electricity might 20-40% more than what you pay with your regular utility. If it’s a flat amount per month, it might cost $20-40/month. BullFrog Power pricing as of 2023 is $21.25 for a detached home; this is supposedly the equivalent of generating 850 kWh of green electricity.

Remember to look at the total cost of your electricity bill. In Ontario, there are a number of charges that are added to your bill based on consumption. The percentages below show how much each contributed to my final electricity bill from my not 100% green electricity supplier, in October 2023:

  • Generation charges (49%)
  • Delivery charges (37%)
  • Regulatory charges (3%)

In Ontario, the only charge that changes is the generation charge. The electricity is still delivered by the grid, so the price per kilowatt for delivery stays the same. The same regulatory charges per kilowatt apply regardless of where those kilowatts came from.

As you can see, less than half of my last dirty electricity bill was for the electricity generation. You need to bear this in mind when people tell you green electricity costs 50% more, or twice the price of your current supply. Way back in 2006 before we switched to Bullfrog Power, we were paying $0.05 per kWh for generation charges. When we switched, the price jumped to $0.083 per kWh. That sounds like a 66% increase. But the other charges per kilowatt didn’t change, so in fact we only wound up paying a 25% increase per kilowatt hour.

Green electricity that’s cheaper than the dirty stuff

But in our case, we didn’t wind up paying 25% more on our electricity bill after we switched to a green supplier. And neither will you, if you combine the switch with an ambitious plan to save electricity. The key is to combine your switch to a green supplier with cuts to your energy use.

If you’re concerned about being able to afford green electricity, another approach is to cut your electricity use first, until your consumption is low enough that even after a switch you’ll be paying no more than you did at the outset with your original supplier.

Take a look at the following chart, which shows our household electricity consumption, and our total cost for electricity, from February 2005 to May 2008:

Electricity usage and cost before and after switch to green supplierElectricity usage and cost before and after switch to green supplier

This chart shows our cost and consumption over time, relative to our bill of February 2005. I computed the kilowatt hours per day and total cost per day, and normalized to 100 for February 2005. The first green bill came in April 2006. The spike in consumption in April 2006 is reflected in April 2005 and April 2007; it may reflect an actual reading after several estimated readings. In any event, there are two key things to notice about this chart:

(1) The cost for a given amount of consumption changed from a normalized ratio of 1/1 to one of about 1.28 to 1 after we switched suppliers. In other words, we were paying 28% more for each kilowatt hour.

(2) The total cost of our green electricity, after our energy saving measures were implemented, dropped to between 10% and 15% more than what we would have been paying on the old, dirty electricity rate.

Since this chart only shows what we actually paid, it reflects any price increases in our green electricity after we switched, but does not reflect any price increases in conventional electricity after we switched. If we had stayed with our conventional supplier, we would probably be paying about 5-10% more by June 2008 than we did in December 2005, so the 10-15% extra cash we were paying out for green electricity in that period, after our energy cuts, was probably closer to 5% extra.

With a little hard work, you can afford green electricity, and you’ll be helping make the planet a healthier place for all of us.

Green electricity suppliers by region

If you know of a truly green electricity supplier in your region, contact us and let us know; we’ll point to them.


Bullfrog Power ( sells power through your local utility to residents of Ontario and Alberta. Their power is sourced from wind turbines and micro hydro. Our family was one of the original “Bullfrog 100” – the first customers to sign up.



My mother in law lives in Ohio, where green electricity is starting to become available to people who aren’t able to generate their own., specifically their pages on green pricing programs and on green power, may be of help.

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