Ditching traditional diesel and petrol vehicles and charging your electric car at home could wind up saving you thousands
If you’re in the market for a new or nearly new car and low running costs are a priority, the chances are you’ll probably plump for a diesel. However, the image of diesel has come in for a bit of a hammering in recent times thanks to concerns about its contribution to toxic air pollution in urban areas, not to mention the VW ‘dieselgate’ controversy.
But even if your environmental conscience plays second fiddle to running costs, switching to a plug-in electric car could save you thousands a year if you can make it work.
According to the Sustainable Energy Authority of Ireland (SEAI), based on doing the national average mileage of 16,000km a year, you would save nearly €900 a year in fuel costs over an equivalent diesel car. This calculation assumes that charging your EV over the course of a year to cover this distance would add just over €200 to your annual electricity bill, while the diesel car (56 mpg or 5L/100km) would cost nearly €1,100 a year to fuel.
The cost comparison calculator on the ESB ecars website produces similar figures. The average diesel car doing 23,000km a year would cost €1,800 a year to fuel, while the EV would merely inflate your electricity bill by just €300.
Add to this cheap tax and the likelihood of lower servicing costs for an EV because there are few moving parts to worry about.
Needless to say, pure EVs won’t suit everyone,. However, huge improvements in battery range, the number of public charging points as well as model availability has seen the Irish EV population grow faster in the last three years, albeit from a low base.
There are now 1,200 charging points around the country, and given the still tiny numbers of EVs around, there have been relatively few reports of difficulties in accessing them.
While the sales trend is upwards, it’s still steady rather than dramatic, according to figures from the Society of the Motor Industry (SIMI). So far this year, 434 (298 electric, 136 plug-in hybrids) have been sold, which seems well on track to beat last year’s figure of 690 (392 electric, 298 plug-in hybrids).
More choice
There are also many more makes and models now available. While the Nissan Leaf is by some way the most popular EV, you can also choose from cars like the Renault Zoe, BMW i3, Hyundai Ioniq, VW e-Golf, and Audi e-tron A3. There’s even a people carrier in the form of the Nissan E-NV200.
There’s also probably the coolest electric car brand of the moment, Tesla, which opened its first Irish showroom this week
Mind you, you’ll need deep pockets for those. A Model S saloon will set you back over €80,000, while prices for the new Model X SUV arriving this year will start at over €110k.
Indeed, even the more open-minded motorists among us are likely to have been put off by the high prices of electric cars relative to comparable petrol or diesel versions, even with the SEAI grant and VRT rebate that electric cars qualify for.
For instance, the full price of a VW e-Golf is nearly €45,000, but thanks to the SEAI electric car grant of €5,000 along with a further €5,000 in VRT relief, the on-the-road price is slashed to just over €35,000. However, even the highest-spec diesel Golfs are priced at just over €30,000.
But if the trade-off between the higher upfront cost and the long-term savings in running costs seems reasonable, how do the economics of running a pure electric car stack up in the real world? We got in touch with a number of members of the Irish Electric Vehicle Owners Association (IEVOA) to ask them how the sums were working out for them.
Contrary to the popular perception that current EVs only make sense for shorter journeys, not only are many doing quite high mileages with the help of the public charging infrastructure, their pockets are considerably better off.
Many reported they had been previously spending anything up to €250 a month on fuel but are instead now paying up to €40 a month extra on their electricity bill (and often less if they used free public charging points).
Dave McCabe, an committee member of the IEVOA, which has 800 owners in its Facebook group, says the vast majority of owners seem to be happy with their decision to switch to EVs.
He says the key to serious EV cost savings is down to mileage; the more you do, within reason, the more you save. “Because we have free public charging, there is no situation at the moment where a EV is dearer to run then a petrol or diesel car,” he said. “What you find is that low mileage EV users might only make small savings, simply because the alternative amounts of petrol or diesel they would buy are not significant anyway.”
Charging for charging
ESB ecars, the division responsible for rolling out and maintaining the public charging points network, did propose to introduce charges late in 2015 only to postpone the decision following a bit of an uproar, and followed by talks with the Commission for Energy Regulation. Customers would have been charged €16.99 a month for unlimited access to low-speed one-phase charging points nationally along with a extra 30c a minute if you use one of the fast charging points.
Denis O’Leary, head of smart energy technologies at ESB, says charging will be introduced “at some point in time”, although what those charges would be is the subject of a consultation and review by the Commission for Energy Regulation (CER) that is due to be completed shortly. However, Declan Meally, head of emerging sectors at the SEAI, says that even when charging is introduced, it is unlikely to affect the running costs for the estimated 90-95pc of owners who charge their EVs at home. He adds that the Government may consider a range of further incentives to boost EV take-up.
But there is also a concern over the higher long-term depreciation of EVs compared to conventional cars. Analysis by car-history -checking website MotorCheck, which monitors the residual values of the car market for banks and manufacturers in Ireland, shows that the average ‘C Segment’ car (Ford Focus, VW Golf) will be worth 42pc-47pc of its value over three years with an average mileage, while EVs are averaging between 28pc-34pc.
“One of the issues affecting the used values of EVs is that the technology is still pretty much in its infancy, and that means it is moving forward at a fast pace, with the result is that an EV purchased today could be obsolete in terms of technology within two or three years,” says MotorCheck managing director Michael Rochford.
These factors didn’t stop John and Lisa Carey from Dublin from opting for a new Nissan Leaf (a 30kwh version) last year, and they later replaced their second car with a second-hand 2011 Leaf (24kwh version). John Carey, who does about 20,000km a year, calculated that the total cost of ownership of the new Leaf over the first five years – including finance, electricity, tax, insurance and servicing – worked out at €7,500 compared to €9,050 for a comparable diesel car (in this case a Ford Ecosport).
But it was the total per annum cost after five years (once the car was paid off) that is the biggest eye-opener, with the Leaf working out at €1,030 a year to run vs €3,470 a year for the Ford. The difference, besides the fuel vs electricity costs, is the cheaper motor tax of the Leaf and the assumption that the Ford is more expensive to service as it gets older (fewer moving parts in an EV, or so the argument goes).
Real-world range
Carey’s 161 Leaf has a realistic range of 160km, while the older 2011 Leaf can do about 90km, which he says “is perfect for a local runabout with occasional airport runs, etc, while 160km can get me anywhere in the country with only one 30-minute stop, which is good enough for me as I would like a break by then anyway”.
Carey said they did wonder before buying the new car if they should hang on until battery ranges improved. (The Nissan Leaf’s claimed range is 250km, but many owners also urge would-be buyers to take manufacturers’ range claims with a large pinch of salt).
“There will always be better on the horizon but we decided that we could either wait for more than we needed regarding range, or accept that what is available now is perfect for our motoring needs. The small sacrifice of the odd 30-minute charging stop is justified by the cost saving.”
He’s also not concerned about depreciation because they tend to hang onto their cars rather than trade them in every few years.
However, the higher levels of depreciation of EVs, including in Britain, have allowed others to get into nearly new EVs for a lot less than they would have paid new.
Last August, Pat Rabbitte from Ballyhaunis, Co Mayo imported a 2014 Nissan Leaf from England for the all-in cost of €9,300. Furthermore, he was spending €160 a month for diesel on his previous Ford Fiesta, and now estimates that he has saved nearly €1,300 in just over seven months of owning and driving the Leaf to work in Galway.
“In my case, my motivations were purely financial – and I did so knowing that I was going to have to compromise in terms of having to use the public charging system, and having to be patient with long-range journeys. It doesn’t stop me from doing them but they can be arduous.”
This article first appeared in the Sunday Independent
18th century ruin becomes stylish low-energy home
Homeowners Anne and Patrick Jordan’s ambitious upgrade and extension project in County Kildare took the shell of an 18th century farmhouse and transformed it into an elegant family home with a striking-yet-sensitive modern extension — all while embracing a healthy and fabric-first approach to retrofit combined with clever heating system design that has brought them from a G to an A3 rating.
You can’t see it when you turn off the main road and start driving down the short but narrow gravel pathway, but once past the forest of trees that hide this newly renovated 18th century farmhouse from general view, its tall four-storey structure reveals itself dramatically.
As first impressions go, it looks great. It’s far more understated than you might expect a building like this to be — you might even describe it as minimalist, with its simple and subtle finishes. Pebble-dash may be out of fashion, but this building has an unpainted period roughcast finish that looks just right.
The traditional white sliding sash front windows are beautifully painted and elegant, while everything else, including the front porch, the steps and the landscaping are all finished in the same subtle but tasteful theme.
But you’re also looking at a historic building that has been retrofitted to a building energy rating of A3, a spectacular achievement in anyone’s book. After all, there are a whole range of challenges involved in trying to undertake a deep energy retrofit on a building like this — and some building conservation experts would argue that you shouldn’t even try to. So, how did the team behind the project — which included Maxwell Pierce Architects, Mesh Architects, and leading low energy builder Pat Doran Construction — manage to do it?
Part of the answer comes as the driveway sweeps to the far left side of the house, where a large, ultra-modern and multi-angled extension at the back gradually comes into view over the long and high rubble wall that fences off the rear of the property.
It’s not the type of modern extension that is common on other historic buildings, which often feature a glassy tunnel-type link connecting the old building with what is essentially a brand new structure. This is a proper extension — it’s all of one piece.
(above) The house is ventilated via Lunos decentralised mechanical ventilation systems with heat recovery.
Looking at the technical specs, it’s clear the new extension could probably achieve passive house certification on its own with its passive slab foundations, triple-glazed windows, airtightness, and a highly angled design and orientation that seeks to maximise solar gain.
But while it turns out that a high BER rating was achievable for the whole building, striving for passive house certification would have made no sense because of the physical marriage between a modern high-performance extension envelope and an old-style, solid masonry, minimally insulated structure with traditional sash windows and a four-storey construction that is just one room deep, resulting in all the main rooms having three or four external walls (meaning there is a high surface-to-volume area from which heat can escape).
Architect Bill Maxwell of Enniskillen-based Maxwell Pierce has worked on plenty of historic buildings with extensions, but making such dwellings work as single, seamless entities from an energy and comfort point of view can be difficult — unless you also have the opportunity to strip the older building back to its bare bones and start again from scratch, as was the case here.
If this is not possible, he actively discourages adding modern extensions to historic buildings because of the propensity of the older buildings to devour heat. If the homeowners cannot make serious improvements to insulation and airtightness in the original building, they will have to continue spending huge amounts just to keep the temperature of the old, leaky house somewhere near that of the new, well-insulated extension.
“The wee pieces that we have added on as extensions umpteen times for listed buildings don’t have any huge positive impact on the overall property. The difference with the Jordans was that the extension became so much part and parcel of the house and we didn’t want to have that division between the old bit and the new bit.”
But what added a further difficulty to the deep retrofit of this particular near-300 year-old building was the zeal with which Kildare County Council required homeowners Patrick and Anne Jordan to preserve as far as possible its essential character and salvageable features. It turns out the local authority is more active in this regard compared with many others around the country, because so few historic buildings of any kind remain in the county.
“On the cold-but-sunny morning I visit, it feels nicely warm everywhere in this house, without a hint of stuffiness.”
When Patrick and Anne Jordan first spotted the house in 2009 (the couple and their five children were living just a few hundred yards away), it was in a bit of a mess, having been abandoned by its elderly owner a few years previously, and subsequently subjected to a period of continuous vandalism by students from a nearby secondary school before the windows were blocked up and the property made reasonably secure.
The couple bought the house and sat on it for a while before investigating the possibility of renovating it and adding a glassy extension. The house already had an ugly rear extension made out of pre-cast concrete that was grafted on in the 1920s, providing a plumbed toilet, kitchen and utility.
To this end, they consulted with a number of different architects, including one who had close links to Kildare County Council, and who persuaded them that the original structure was definitely worth preserving. But when they went to hire her services, she was all booked up — much to their disappointment. So they decided to knock the whole edifice down in favour of a new house of similar character.
“When we did that, Kildare County Council pounced and put a preservation order on it, despite there being no historical reference to or record of the building anywhere,” said Anne Jordan.
Although the couple conceded to KCC’s demand that they go back to their original plan to preserve and extend, Anne doesn’t hide her exasperation at the exacting and sometimes tedious demands of the building conservation procedure that followed, which included continuous consultations with the local authority as the project rolled along.
(Above) the house is heated by an Ochsner 18kW air source heat pump, with features a separate horizontal split evaporator that sits outside the house. The system includes an 800 litre buffer tank and a 300 litre hot water cylinder with exhaust heat recovery from the bathrooms. Heat is distributed via underfloor heating circuits throughout all three floors of the house.
“We were told this house had to be tended to carefully, and that it needed a grade one architect, which is a load of whallop because it’s just a farmhouse, it’s not government buildings…Conservation is important, but we were trying to embrace new ways as well,” she added.
Sunni Goodson — an architectural conservation specialist with grade one architects Mesh — was appointed to be the main intermediary between the Jordans and the council. She readily concedes that the house is not a protected structure and that much of its historic fabric had been compromised, but says it was “still just a gem of a house”.
“The vaulted brick ceiling at basement level and a portion of the original staircase survived, as well as floor structures, chimney breasts and the 19th century front porch,” she said.
Before Kildare County Council intervened, the Jordans had hired Bill Maxwell to oversee a new build project, but his historic building experience would make him an even better choice when it became clear that a complete new build wasn’t going to happen. “One of the biggest challenges was getting an underfloor heating system into the fabric of the existing old building without completely destroying the historic fabric,” said Maxwell.
Apparently this caused more than a few issues — joists were too narrow for the relevant pipes and had to be adjusted, and there were parts of the floor where joists needed steel reinforcements, lest the pipes should break because of excess movement.
“But we managed it,” said Maxwell. “It was well worth it. Because without that it would have been a bit of an imbalanced arrangement.”
It also meant that the Jordans could have the modern heating technology that they wanted. The system they chose is based on underfloor heating all throughout, driven by an Ochsner 18kW air source heat pump that features a separate horizontal split evaporator that sits outside the house. From a distance it looks like a large DJ twin turntable, and it was designed by Monaghan-based firm Eurotech in conjunction with Ochsner, with a view to taking advantage of the mild humid Irish climate. It boasts a co-efficient of performance of over 400%.
One advantage of a horizontally mounted evaporator, according to Eurotech’s Gerry Duffy, is that at times of higher humidity, any excess water generated just runs off the table and onto the ground.
“Using floor heating in the existing structure allowed us design a system with very low-flow temperatures which is critical in dealing with old fabrics and heritage structures,” said Duffy.
“The very low design temperature of 30C flow max is enough to allow the entire structure to heat up and dry out without causing any damage, and at the same time repelling moisture and lowering humidity to a desirable level, perfect for comfortable living.”
The system, which includes an 800 litre buffer tank and a 300 litre hot water cylinder with exhaust heat recovery from the bathrooms, is designed to ensure that the base temperature of the house never falls below 16C. The Eurosmart system has room-by-room heating controls, and features smart sensors that learn how each part of the building behaves (with their differences in building fabric, insulation, orientation etc) and adjusts the input of heat accordingly to achieve a consistent temperature throughout the building. Meanwhile, ventilation duties for both the new and old buildings are courtesy of a decentralised Lunos heat recovery ventilation system – a solution that enables low energy ventilation without running ductwork. The large house requires a dozen Lunos E2 decentralised heat recovery ventilation units, a Lunos Ego HRV unit and thee low energy extract fans.
Although the Jordans are only in the house a matter of weeks, Anne is delighted with the comfort levels throughout — particularly as the bedrooms of her five children are all in the old part of the building. Gerry Duffy estimates heating bills will amount to €700 a year for this 400 square metre property, which will be hugely impressive if he is proved right.
Of course, the upgrade to the fabric of the old building — and the new high performance cavity wallextension — are both vital for keeping energy costs down too. The old rubble limestone walls are thick but fairly porous, so it was essential to insulate them in a sensitive manner, using products that allowed them to “breathe” — in other words, that allow water vapour to pass through unimpeded.
The shell of the old house that the Jordans purchased prior to the retrofit; a vaulted brick ceiling is one of the original architectural features incorporated into the renovated property.
“Fortunately there are wonderful new products on the market which can be used in a historic context, such as Gutex and Calsitherm, depending on the wall construction material and external finish. They are breathable products that significantly increase the building’s thermal efficiency and the occupants’ comfort, but they can also be finished with lime plaster,” said Sunni Goodson.
The exact choice of insulation materials was determined by an analysis carried out by Joseph Little of the Building Life Consultancy. The 600mm-thick rubble walls were all boarded internally with 40mm of Gutex Thermoroom, with internal lime plaster as an airtight layer (the roofing throughout the building features Pro Clima membranes for airtightness and vapour diffusion). The whole house scored an airtightness result of 1.3 air changes per hour — an exceptional result for such an old dwelling, and such a complex project.
The work of project manager and contractor Paul Doran and his father Pat (both of Pat Doran Construction), was clearly crucial in meeting such remarkable levels, particularly when faced with the prospect of a building that Maxwell described as “an awful looking kind of haunted house ruin of a thing” — and making it airtight.
“Even with that starting point I was wondering could we achieve it,” Bill Maxwell said. “And it was then down to getting the builder involved, and making sure that they were interested in it, and the Dorans were more than interested. So it was a good bit of teamwork.”
Paul Doran said: “I think we did things the right way. We were very lucky in that the architect was committed and the quantity surveyor [Michael Broe] took a big interest and put a lot of time and effort and energy into it. And Anne put in an enormous amount into the project every day.” The Dorans were undoubtedly helped by their experience on other challenging projects, drawing from a well of experience picked up on certified passive house and Enerphit projects, including a complex retrofit on Zion Road, Rathgar featured in issue 12 of Passive House Plus.
As part of the conservation tick-box, the sliding sash windows of course had to stay, although most were replaced. The Jordans were keen on double-glazed sash windows, but these would not fit into the narrow depth of the historic glazing bars. An expensive solution was Slimlite glazing, which is essentially two panes of glass held very close together.
At first glance, some might say the design of the roof looks unnecessarily complex. Maxwell said: “There’s a reason that happens, which is just trying to get the line of the roof that abuts the back of the old house [to] tuck in between window sills, so that we didn’t actually alter the openings in the back of the old house. Then that generated one angle, which led to another.”
This is also the reason the extension is angled at around 45 degrees to the old building, which gives the light-filled space inside, including the kitchen and the mezzanine gallery above it, a peculiar triangular shape that works very well. You can also see the back of the old house very clearly from here too.
On the cold-but-sunny morning I visit, it feels nicely warm everywhere in this house, without a hint of stuffiness. It’s something that clearly delights Anne and her family and allows them to enjoy the old and the new in equal measure, because it’s all been done so well.
“What’s actually rewarding about the building is the angles, because when you’re inside, no matter where you stand, there are views everywhere,” she said.
Standing in the utility room in the basement of the old building, I ask Anne if all the conservation rigmarole was really worth it. “Oh god it was worth it, jeepers yes. This makes the new part. It is so rewarding that it is warm and comfortable. I think if you’re going to do it, it’s important to do it right.”
This article first appeared in Passive House Plus magazine