District Heating Houses

2022 Heat Price Review Preview

Some residents have asked whether we’re likely to see substantial price rises for our heat, given the changes of gas prices over the last year.

The short answer is “yes”, but perhaps not as bad as it could be. Most of our heat is from gas, but most of what we pay is not related to the price of gas, but to RPI (retail price index) inflation. Sadly, inflation looks set to be high this year.

Our prices are reviewed annually, on 1 March. That’s good news: otherwise we’d paying more already. But come March, we might be in for a shock. I don’t have a crystal ball, but I do have a spreadsheet. I sent a copy of my calculations to Veolia, who said they would comment if I was making any wildly incorrect assumptions. They haven’t commented, so I presume the following is reasonably accurate. Bear in mind that they also don’t know what the price of gas will be in March, or RPI.

Base line

In 2021-2022, we’ve been paying these prices:

Standing Charge: £417.46 per year, though I understand tenants pay a lower price of around £100, but I’m not sure of the exact amount. I don’t know if that’s because Veolia charge less, or because JRHT pay part of the cost as the landlord. 

Unit charge: 6.649p per kWh. This is composed of a Fuel Charge, and a permitted “Margin” of 4.53p. Veolia’s price review letter will illustrate charges with a “typical” usage of 6,300 kWh. Coincidentally, this gives an annual fuel cost of £418.89, almost exactly the same as the standing charge. But, of course your usage could be much lower, or much higher than that.

Price changes.

Price changes are adjusted like this:

  • RPI inflation: The rate published for November was 7.5%. My guess is that RPI will be between 5% and 10%. Some parts of the cost are linked to inflation.

  • Standing charge – this will increate by the RPI inflation rate.
  • Unit charges – these are composed of a fuel price and a margin. You may be able to reduce your heat charge by using less heat or hot water. The unit charge is composed of two elements.
    • Actual fuel prices. We pay the same that Veolia pay for gas and wood.
    • A margin. On top of the fuel charge is a fixed margin, which increases by RPI inflation every year. This is currently the bulk of the unit price that you pay.

Veolia say that their wood chip price hasn’t gone up much: less than inflation. So, I’ve allowed for an increase a bit less than inflation.

However, they buy gas at wholesale prices. Veolia haven’t said how much they’re paying for gas. It’s possible to buy gas well ahead of using it, so the increase may not reflect the prices that you hear in news headlines.

My assumptions for March are as follows:

1. RPI in March will be in the range 5-10%, I modelled 5% in a low scenario, and 10% in high scenario calculations

2. Wood price increase will be moderate, perhaps less than RPI. I modelled 3% in a “low” scenario, and 7% in a “high” scenario.

3. Gas prices will increase two or three fold. I modelled 2x in the low scenario, and 3x in the high scenario.

4. Veolia will continue to target a ratio of 45% wood and 55% gas.

This table shows my calculations for the unit charge. The bottom line shows that the increase might be 20% to 40% – but that depends on the assumptions above. In particular the gas price assumptions, which are the most important, but the most uncertain.

Pence per kWh2021-22Low scenarioHigh scenario
Gas (2x or 3x)
(3% or 7%)
(gas + wood)
Margin (RPI increase)4.534.764.98
Fuel + Margin
% increase in unit price21.0%42.1%
Modelling the possible increase in unit charge, where the “Low” scenario has inflation at 5%, and gas price doubles. The “High” scenario has inflation at 10% and gas price triples. Note that the overall increases are not nearly as high as the gas price increases.


My prediction is that our prices will increase a lot: at least by inflation which could be between 5% and 10%. If you don’t use much heat, then that’s roughly the increase that you’ll see. But if you do use a lot of heat, then the increased fuel cost will be more important, and that could be 20% to 40%, or even more. And the total hit will be somewhere between the two figures, maybe 12% to 25% for a typical user.

I modelled an even worse scenario: with gas prices up by five times, and inflation at 10% and this gave a 75% increase in our heat price, and perhaps 42% total bill increase for a typical user.

Veolia illustrate expected prices with a “typical user” using 6,300 kWh, which we think is about average for a three storey, 3 bed house. Last year, the unit charges added up to about £420: coincidentally about the same as the standing charge, so the total about £840, and I’d imagine that that typical user would see the bill rise by something between £100 in the low scenario, and £200 in the high scenario per year.


My assumptions here could be wrong. Maybe inflation will be higher. Maybe Veolia didn’t get such a good price on gas. On the other hand, inflation could come down below 5% and maybe Veolia have a great price on gas. We’ll find out on March 1.

One more thing: if retail gas prices go up hugely (more than three times), then we might have to add about a penny to our unit charge, due to the “cap and collar” mechanism on our charges. At the moment, we pay a “collar” price, but the Margin on the “cap” price is about a penny higher.

Heating system review

At the request of the Residents’ Association, JRHT have commissioned a review of our district heating system. The aim is to find ways to make the whole system more efficient, so that it becomes more energy efficient. That could make the system cheaper to operate, more climate friendly, and could even reduce your heating bills. Veolia and DRA are cooperating with that review.

community Houses Public areas surveys

Thinking about Derwenthorpe: survey results

In February 2020, just before the COVID-19 lockdown, Derwenthorpe Residents Association surveyed residents views on community infrastructure: the things that make it easy to get to know your neighbours. 

We knocked on every door on the estate, and asked people to complete our survey on paper, or online. Where there was no answer, we left a copy of the survey, which included the address of the online survey. In all, we got 123 responses, which is about 25% of all households. So, not completely representative, but we thought it was quite good given that we didn’t follow up.

There’s a more detailed report available:

What do you like about Derwenthorpe?

We asked “What do you like about Derwenthorpe?”, and tagged the answers, with one or more of these themes:

TagsNumberPer centnotes
Community7561%Incl “neighbours”, and “people”
Green space6957%Incl “lakes”, and “wildlife”
Houses5444%Incl internal utility and external appearance.
Transport2823%Incl cycle route 66, buses, and access to A64
No response54.1%
community space21.6%
What do you like about Derwenthorpe? % of people that mentioned each theme.

What community events have you attended in the last 12 months?

We asked which of these events you’d participated in, in the past year. 80% of you had been to one or more events. And, on average, people had been to four of these types of event.

To create a true community building, which of the following are needed? 

We asked what you facilities you thought were important for a community centre.

Larger Meeting Rooms6250.4%
Process for Booking8569.1%
Disabled Access6956.1%
Other 4939.8%
What facilities are important for a community building?

We asked what the best time to hold events would be. Of course, it will depend on the event, but here’s what you said:

The best times to hold events at Derwenthorpe (number of respondents who chose each time slot; some chose more than one time slot).

Household composition

We asked about the numbers of adults and children in each household. We’ve summarised the results in this table. Of the 78 children reported, twenty were under 4, forty-three were 4 to 10, and fifteen were 11 to 16. There were 232 adults reported.

Household compositionnumber of households
One adult, no children18
One adult, with children4
Two adults, no children46
Two adults, 1 child19
Two adults, 2 children20
Two adults, 3 children4
Three or more adults10
NB: one of the three adult households also had a teenage child with them. Some of these adults may be over-fifteen-year-old teenagers. We didn’t ask whether “two adults” were a couple, or anything else about the relationships between people.

Thank you

We’re grateful to those who responded. And, we’re sorry it took so long to publish these results. Things kind of got in the way in 2020! Please let us know if you have any comments or questions. The survey happened just before the first COVID lockdown. Do you think differently about Derwenthorpe now?

District Heating Houses


Derwenthorpe resident Catherine Jardine asked Studio Partington -(who designed our houses) for advice about controlling summer heat. We start with some tips on how to use what you’ve got, and then there’s some advice about external shades that you can add. And if you want to learn more, there’s a guide from the NHBC, also written by Partington Studios.

Keeping your house cool

Good ventilation is … key. … Get cool air circulating through the house in the early morning and late evening and then close everything down once the external temperature [is above] the internal temperature (this is second nature in a Mediterranean climate, but not so in Yorkshire!).

The worst time is usually mid to late afternoon, when … heat is coming into the home directly from the sun and when the [air] temperature outside is also high, ….

Richard Partington, Studio Partington

So when it’s going to be a hot day (over, say, 19 degrees), keep your doors, windows, and blinds closed during the heat of the day to stop the house getting too hot: you can’t cool a house down with warm air, even if it is breezy. In the evening, when it’s cooled down again, open windows front and back to get the house cooled down again.

Check the windows and doors section of our house guide, to find out how to prop your windows open safely. Open them front and back, to allow cool air to flow through.

External shading

Some form of sunshading externally will certainly help prevent unwanted solar gains but there are some things to think about if a shading device is retrofitted. Firstly it is much easier to control south facing direct sunlight rather than east or west.

On a south side the sun is high and a structure projecting horizontally from above a window will shade the window by approximately the depth of the projection (sun being at 50 or so degrees height in June).

Low level east and west sun is much harder to control and is usually shaded with vertical fins or some kind of draw down external blind. Both of these are difficult (as is the traditional Mediterranean shutter) with the way we make windows in the UK, which are always outward opening to keep the rain out.

Richard Partington, Studio Partington

Note that close fitting internal blinds can also be effective, if you use them well.

This kind of shade isn’t useful with outward opening windows.

I attach some examples of what can be done as a retro-fit. The … wall will need to support the load of the shade so there will often be struts or cables and fixings at several points back to the brick work.

As with most things the best solutions come from traditional simple to operate means such as shutters, which would work over non-opening windows, but there are more sophisticated and automated systems. The most innovative manufacturer is Renson, who do commercial and domestic shading systems.

The little guide we did a few years ago for NHBC (also attached) explains the problems we are starting too see in well insulated homes and although more of an issue in urban areas people are beginning to be concerned about rural schemes as well.

Richard Partington, Studio Partington

Read more:

Global warming means we’re seeing longer, hotter summers. Air conditioning makes it worse: and is expensive to use, but shading and natural ventilation are free. So we hope this guide will be useful to you!

Blogroll Houses

Solar Panels Initiative

In 2019 Carey English set up a group for those interested in action for the prevention of global warming – a group which Nick Hall and Jean Lavers joined. It was a small group at first but nonetheless we planned and executed many events under the heading “Love Your Planet”. When Carey and Guy moved away at the end of 2019 we tried in vain to find a replacement as leader. Nick and Jean, called a meeting in January, deciding to promote the solar panels project in Derwenthorpe. Two other households had the same idea. We were convinced it was a good, long-term investment and a way of reducing our carbon emissions. As the Energy Saving Trust says:

“Solar Electricity is green renewable energy and doesn’t release any harmful carbon dioxide or other pollutants. A typical home solar PV system could save 1.3 to 1.6 tonnes of carbon per year (depending where you are within the UK).”

Over the years Jean and Nick had sounded out Joseph Rowntree Housing Trust as to whether they were going to initiate a project to put solar panels on our roofs, let us keep some or all of the electricity generated, and sell surpluses to the grid. Our covenants on purchase of our houses allow them to do that. But by 2020 it was clear they weren’t going to. So, if we wanted solar panels, we would have to buy them ourselves. We decided to try. Making that decision felt good. Making a reality of it required much learning, much effort. It was a two-track process: (1) finding out if anyone else in Derwenthorpe was interested, and promoting the idea; and (2) was there anyone out there who we’d trust to clamber about on our roofs and put panels on, and get the wiring right and all the other equipment?

We formed a small working group: Jean Lavers, Nick Hall, Harriet Ennis, Chris Ennis, Richard Lane, Graham Smith and Ian Eiloart. We are non-expert Derwenthorpe residents except for Richard, who works in sustainable energy and kindly gave his time as a volunteer adviser. We got plenty of encouragement and useful advice from JRHT, particularly Joanne Lofthouse (Derwenthorpe Manager) and Owen Daggett (Sustainability Manager). Richard Partington and his colleagues, architects for Derwenthorpe, gave us both encouragement and very helpful technical advice.

1.Publicising the initiative

We began by designing a questionnaire, aimed at gauging what level of interest there might be in Derwenthorpe. How keen were residents to get (and pay for) this addition to their houses?

Then came lock-down. At that time (mid-March) no-one, we felt, would be interested. We went to sleep (got involved in other things) for a couple of months. Late April, though, the invitation came to put something into the newsletter “LotsOn in Lockdown”. Why not a 3-line item asking each reader what they thought of the idea? We got a couple of dozen positive responses.

We followed this up with an article on the DRA website, copied onto Facebook  –  this produced several more interested people  –  enough to know that we were going to get a group able to have a serious dialogue with suitable firms.

We also wanted to be sure that every household had the chance to consider the idea. We drew up a questionnaire, asking simply: do you want a no-obligation quote? Yes or No?  Similar questions for a battery and whether the battery should be able to charge an electric vehicle. Thanks to some dedicated volunteers we got questionnaires to all the Derwenthorpe houses (some 450) by mid-July. About 20 new addresses came up as a result  –  60 in all.

2. Choosing installer firms

The first concern (April/May 2020) was whether any firm was doing this kind of work, and could they do it under the various Covid-19 restrictions. And would they?

We obtained details of twelve firms from the relevant part of the Which? Trusted Trader list, plus two by recommendation from JRHT, who had used them on other projects. We wrote to them asking if they were interested and if there would be a discount on bulk purchase.

Our first check was whether or not they were listed under two quality control schemes: MCS and RECC.

MCS is the Microgeneration Certificate Scheme. MCS certifies low-carbon products and installations used to produce electricity and heat from renewable sources. Having an installation certified by MCS means that any surplus power generated is acceptable to the grid.

RECC lists firms who have signed up to the Renewable Energy Consumer Code, which governs things like technical site surveys, getting necessary permissions, contract documentation and customer care issues.

We sent a Request for Information to five of the firms, selected from the original set as being listed under both MCS and RECC schemes and being not far away (the furthest being Leicester). From people we had heard from as being interested in the project we had 16 addresses whose residents were happy for the five firms to estimate, by desk-top survey, what a system would cost. (The prices were expected to vary from house to house according to the size of the roof and its orientation, etc.). We asked each firm about:

  • Price per property for installation etc. of a grid-connected solar array
  • Price per property for appropriate battery
  • Discount per property if the project were for 25 or more households
  • Timescale
  • Warranties
  • Health & Safety, including precautions against CV 19
  • Sub-contracting, e.g. for scaffolding
  • Contracts, rectifying snags, etc.

The firms sent back much documentation, about the panels they were likely to install, about the inverters (required to convert the DC which the panels generate into usable AC power) and about batteries; also about their working practices, contracts etc.

The working group met by Zoom on 8th July 2020 and we pooled our knowledge and understanding of the bids; agreed to include design of panels in the evaluation (we preferred black); and discussed differences between the firms’ contracts and documentation. We decided to recommend to residents two firms  –  ASK Renewables and Carbon Legacy. (See at end for contact details.)

3. Open-Air Real Live Socially Distanced Meeting

Both these firms said they were willing to come and talk to residents, and several of the households who were in touch said they would like to meet and discuss the scheme. We fixed Saturday 1st August as a good date; and Joanne was happy for us to have the event on the un-enclosed grass space outside the SSC. We wanted a serious hearing and discussion, and above all a safe one. So we only invited people who’d already been in touch. Just under 30 people came, from 20 households. The weather was kind, we could all hear and be heard (only one noisy aircraft interrupted) and we learned much about both theory and practicalities.

From there on it’s been up to each household to make contact with and deal with one or both of these firms  –  and if satisfied with what’s been offered enter into a contract with the chosen firm.

4. Covenants with Joseph Rowntree Housing Trust

When we bought our houses we accepted a covenant to get consent from JRHT before installing solar panels on our roofs. They agree in principle. Each household should, before committing themselves to a date for starting work on site, send them details of what’s proposed: number of panels, fixing detail, how they ‘ll be arranged on the roof  –  a drawing if possible. Both the firms are aware of this and will help supply the details. We need to allow 3 to 4 weeks for the trustees’ consent to be obtained.

5. Other consents

In order to connect the electricity you generate to the grid (so you can sell any surplus) you need consent from the DNO (District Network Operator). This may take time  –   but the installer will take care of the process. The one for our area is Northern Powergrid  –  for enquiries ring 0845 070n7172.

6. Update latest

ASK Renewables say that they have contacted the names on the list we sent them. They have done 11 visits and issued quotes on each; 2 have applied to JRHT for consent. They have a further 7 visits planned. Carbon Legacy have 20 people on their list as interested in having a site visit, have visited 9 and booked another 5 for September. Their first 9 quotes are ready to go out.

7. Is it too late to join in?

No!  Send your name and address, email and any other contact details to either or both of the recommended firms, and they will make all the necessary arrangements with you. Or give them a call!

Contact details

ASK Renewables Limited
Samantha Kidd 01226 715522 
Carbon Legacy
[NB: we were informed on 11 April 2022 that Carbon Legacy are not working in York due to current high demand]
Shirley Mills 01664 821224

Nick Hall and Jean Lavers
August 2020

Houses naturegroup

Derwenthorpe Solar Panels Project Update

Since we put a small item in the most recent LotsOn (late May) we have had 20+ households say they are interested in a group scheme to purchase solar panels, hopefully at a discount. That’s not the end of the story! We hope that many more Derwenthorpe residents will choose to take part – the main benefits being that you catch your own electricity direct from the sun; and by so doing you can help reduce emission of greenhouse gases and therefore our impact on the climate. And we expect that buying in bulk, from a properly accredited installer, will give each of us savings and other benefits as customers.

We approached twelve firms which came up when we followed the link to “Trusted Traders” in this field; plus two which JRHT have worked with on recent solar panel projects locally. The replies vary in level of detail, but there’s plenty of interest in doing the work for us.

We also asked Richard Partington, architect for Derwenthorpe, about any special considerations which might apply here because of our special design features. His reply was very positive:

  • at projects in Portsmouth and Nottingham they put panels on east- and west-facing roofs, not just south-facing, and “the efficiencies have greatly exceeded expectation”.
  • if you have a sloping ceiling on the top floor the line of insulation follows the ceiling so make sure any penetrations for cables etc. are minimal and executed neatly.
  • ask for advice about the best position for the associated kit (inverter, battery, meter, controller etc.) as it makes sense to group these together.

We’ve kept JRHT informed. We have to obtain their consent for solar panels on roofs, and it will be up to each of us to obtain this formally, but they are in favour of this project. We’re hopeful also that they will find space for a compound for the installation firm to use  –  which should save the firm, and us, time and money.

We have written to five firms with a Request for Information, inviting them to tell us what they can do and asking about:

  • price per property for panels
  • ditto for batteries
  • discounts for larger numbers of houses
  • timescale
  • warranties
  • health and safety
  • whether they would they want an on-site compound
  • sub-contracting
  • contract arrangements with householders.

Other things (apart from cost) for us as residents to think about are:

  • where in the house to site the associated bits (inverter etc.)
  • whether you want a battery (to store electricity gained in the day, for use at night) – and if so where (heavy, so best on ground floor)
  • whether you want to be able to charge a car from solar power, now or in future.

Once we have the firms’ replies we residents will have a discussion about the merits of each, leading to a decision as to which firm to work with. This will probably be a Zoom meeting involving the people who’ve been in touch so far. But we will also be open to comments, expressions of opinion and preferences from people who don’t want to or feel unable to take part in the Zoom thing. If you haven’t already been in touch about solar panels, you’re welcome to do so now (without obligation to commit to having the panels installed): email

The next stage after that will be to send round a house-to-house questionnaire, giving a bit of relevant information and asking everyone to say whether they want to be part of the scheme (again without obligation).

Then we’ll go back to the chosen installer and work out arrangements for start on site; how they will deal with each householder; and how they want to organise progress of the work from house to house. Scaffolding will be involved!

Nick Hall, 38 Derwent Mews, YO10 3DN, 16th June 2020

Work in progress last year at one of the houses in Derwenthorpe


How to use your house

Most of us didn’t get a user guide to the home, so some residents have written one. It’s a living document. Please let us know how we can improve it, in the comments below.

For example, did you know your windows have a built in wedge, that you can use to prop them open. Useful, if you need fresh more air while self isolating!

We think we are all really lucky to live in such beautifully designed homes that have many ‘green’ features. Some of those features were new to many of us, so we have put together these simple and non-technical user guides to our homes. 

We have based this very general guidance on our experiences and research. While many features of our homes are the same, there are also quite a lot of variations, so you may find differences in your place. However, we hope this guide gives you a good starting point. It is offered to you in the spirit of neighbourliness and community — we obviously can’t accept any liability for actions you take based on these guides! 

We welcome further questions and your feedback. Please email

Welcome to Derwenthorpe

Doors and Windows

Insulation and Heating

Putting up pictures and shelves

Thermostat panel instructions


Useful contact details

Water meters

BTW, please get in touch if you live in one of the flats. We’d love to be able to add some more useful information for residents of the flats.