Select Committee on Science and Technology Second Report


CHAPTER 8: Developing markets for heat

8.1.  Demand for low-grade heat—that is, energy delivered at temperatures between ambient and the boiling point of water—for space and water heating represents a major proportion of United Kingdom energy demand. Domestic space and water heating alone comprise around a quarter of total United Kingdom energy end use.[80] The development of effective markets for such low-grade heat could thus deliver very significant carbon savings. These would arise principally as a result of:

  • improvements in generating efficiency (in particular the use of Combined Heat and Power);
  • the capture and use of waste heat from electricity generation and industrial processes;
  • increased use of carbon-free biomass fuel;
  • greater opportunities to capture and store carbon emissions.

8.2.  While not all these potential benefits are explicitly to do with energy efficiency, they are closely interlinked. United Kingdom energy policy has hitherto consistently overlooked heat, concentrating instead on electricity, industrial processes and transport. For example, there is no concerted attempt to collect and use the huge quantities of heat produced by the United Kingdom's power stations, located as they mostly are away from major population centres. As a result, while their electrical output in 2003 was some 398.8 TWh, their fuel inputs totalled 1,031.1 TWh—thus no less than 632.3 TWh of energy were lost, largely in the form of heat dispersed via cooling towers.[81]

8.3.  The omission of heat from the policy mix is also apparent in the relative neglect of thermal solar energy, which, though offering significant efficiency gains when compared with the conversion of solar energy into electricity by photovoltaic cells, enjoys neither the same public recognition nor the same fiscal support, through the Renewables Obligation.[82] Nor has there been any commitment by Government to the development of markets for heat, with the result that, by contrast with other European countries, no significant heat market has developed in the United Kingdom. We therefore take this opportunity to explore these wider issues. In so doing we draw extensively on the work of the Royal Commission on Environmental Pollution (RCEP), which has repeatedly argued for such initiatives.[83]

8.4.  We have pointed out in Chapter 6 that new construction technologies can greatly reduce the demand for space heating, ultimately leading to "passive" buildings with no dedicated source of heating. However, such buildings will make up no more than a small proportion of the building stock in coming decades, so the demand for low-grade heat will continue for the foreseeable future.

8.5.  Such heat can be produced from domestic sources which are essentially carbon-free and readily available, thereby simultaneously contributing to the objectives of reducing carbon emissions and dependence on imported energy. Furthermore, heat distribution can be associated with low operating costs and could therefore contribute to reducing fuel poverty. In addition to use of waste heat from electricity generation, there are major carbon-neutral sources in the form of biomass, from agricultural and forestry waste and energy crops, and solid waste.[84] Because of their low density, biomass and waste are most effectively used locally as fuels for CHP or heat-only plants. Absence of markets for heat has been identified by the RCEP as one of the principle reasons why bioenergy has not developed in the United Kingdom in the way it has elsewhere in Europe.

8.6.  Community heating schemes, distributing low-grade heat in urban areas, were installed in parts of the United Kingdom from the 1950s to the 1970s. However, poor technical performance gave them a bad image, and contributed to an aversion to supply systems which appear not to be under the control of individual householders or building occupiers.[85] Resistance to community heating has continued in construction and development. For example, Mr Hornby, of the House Builders Federation (HBF), told us that he could see no advantages in community heating for individual customers: "With the district heating schemes you have got the potential for losing energy through distribution ducting to the properties. There is no pull factor at the moment for the new house building industry" (Q 229).

8.7.  This seems to be a further example of the inherent conservatism of the construction industry. In fact, the technology of heat provision has developed since the 1970s. Community heating is established practice in urban areas throughout Northern and Central Europe. We were told, for example, in the course of our visit to Gothenburg, that losses from the entire 700 km-long network amount to just 7-8 percent, comparable to the losses in distribution and supply of electricity and far too small to negate the advantages of distributing heat from low-carbon sources.

8.8.  The conservatism of the construction industry is compounded by lack of leadership by central Government. The proposed development of new housing in the south-east of England, much of it of high density, offers an extraordinary opportunity to develop community heating. However, the design and construction of new housing is now left almost entirely to private companies—in 2003, of almost 190,000 new houses across the United Kingdom, private enterprise was responsible for over 171,000, registered social landlords some 18,000, and local authorities just 241.[86] As the RCEP has pointed out, community heating schemes are most cost-effective when incorporated into residential and commercial developments at the design stage.[87] However, in the absence of the granting of clearer guidance and stronger powers to planning authorities on the provision of community heating, it appears inevitable that lower-cost solutions will be preferred, regardless of their long-term impact on energy consumption—a specific example of the general problem identified in paragraph 3.16.

8.9.  We recommend that ODPM encourage local authorities and developers to incorporate community heating as standard in all new build projects.

Technology of heat provision

8.10.  The heat supply system in Gothenburg is typical of current technology. During periods of base load demand—the summer months—the system runs on waste heat from industrial installations including CHP. At other times of year, additional heat is provided by combustion of non-renewable solid waste (which is stored over the summer) or renewable biomass. During periods of particularly cold weather, additional heat is provided by dedicated heating plant fired by oil or gas; this is the only source of non-renewable carbon emissions from the system. The heat is distributed by hot water, pumped through pipes running under the streets. Buildings are connected into this system via heat exchangers which heat up a separate water flow circulated within the central heating system of the building. The heat exchanger is usually located outside the building, typically underground, so that no space within the building is needed for heating plant.

8.11.  The size of the area covered by heat distribution is not in itself a technical constraint; for example, in Gothenburg the network is some 700 km long, with a radius of 20-30 km. The key technical issue is the density of heat demand. As part of a study carried out for the Carbon Trust,[88] Community Energy Heat Maps have been prepared "to identify opportunities for community heating" by showing "demand for heat from homes, public sector and commercial buildings, for every postcode area in the UK".[89] The information needed for planning community heat provision is thus already available.

Barriers and policy measures

8.12.  The most important practical and economic barrier to community heating schemes is the initial capital cost. Ongoing costs are much lower: experience in Northern and Central Europe suggests that, once established, heat distribution systems can be expanded by connecting additional sources of waste heat or dedicated heat or CHP plant, although upgrading existing systems may require replacement of piping and insulation.

8.13.  To overcome this barrier to entry requires positive action to promote a market for heat. The Community Energy Programme (CEP), launched in 2001, is intended to support the development of sustainable community heating in the United Kingdom. The programme is jointly managed by EST and the Carbon Trust on behalf of Defra. Initially the programme had £48 million available for capital grants and £2 million for development support for the period from April 2002 to March 2004, subsequently extended to March 2005 and most recently to March 2008. However, like other actions explored in this report, the success of the programme has been constrained by low energy prices. We note the conclusion of the IPA study that future prices for both gas and electricity are likely to be higher, so that community heating schemes are under-valued by basing long-term calculations on current energy prices. We have also noted that concentration on capital cost without considering the lifetime costs of operating buildings can lead to perverse decisions. Community heating schemes are associated with high capital costs relative to their operating costs. Therefore we regard CEP as an area where it is particularly important for the Government to apply their own recommendations as embodied in the Treasury's "Green Book".

8.14.  We endorse the recommendation of the IPA study that the Community Energy Programme be extended. However, we note that the programme has had limited impact so far, and that commercial barriers to the take-up of heat provision must also be addressed.

8.15.  The first such barrier is simply the lack of demand. We noted above that there is a reluctance, notably in the construction industry, to contemplate community heating and that this flies in the face of experience elsewhere in Europe. While some potential users see the attraction of community heating (for example, retailers in Leicester have been attracted by the fact that heat provision removes the need to allocate space for heating plant), the message has not been universally accepted. Thus in Durham, for example, the University is currently decommissioning a small community heating system that has provided heat to buildings on the Peninsular since the 1950s: the inefficiency of the system itself, compounded by the fact that there is no demand other than from University-owned buildings, make the system hopelessly uneconomic. When we visited Woking, in the course of our recent inquiry into renewable energy, we learnt that a developer in the centre of the town had chosen to install electrical heating in a new block of flats rather than taking heat from the Council-run CHP plant across the road.

8.16.  The schemes supported so far under the CEP are significant but limited in scale, mostly to single institutions or developments. We therefore see a clear need for a few larger scale developments which can be promoted as demonstrations of the value and potential scope of heat provision. We noted in Chapter 4 the need to make such projects simpler to finance, so that local authorities do not perceive them as risky. Such projects should demonstrate the application in the United Kingdom of technology which is already commonplace elsewhere in Europe. Therefore support for such demonstration projects should not be contingent on demonstrating novelty.

8.17.  In addition to capital grants or incentives, low-carbon heat provision should logically be treated consistently with low-carbon electricity provision. Whereas demand for electricity varies on a daily cycle, demand for low-grade heat varies on a different cycle, which is both daily and yearly. This creates particular problems for CHP, where electricity generation is essentially a by-product of heat production, and is therefore in effect intermittent. As Mr David Green, Director of the CHP Association, told us, this subjects CHP to penalties under the New Electricity Trading Arrangements (NETA) balancing mechanism. Whereas the Renewables Obligation protects renewable generators to an extent from such penalties, CHP remains "fully exposed to NETA" (Q 672).

8.18.  The lack of any incentive for heat markets resembling the Renewables Obligation is evidence of the point made at the beginning of this chapter, that energy policy has persistently overlooked the fact that heat is a form of energy. We note that the Government continue to commission studies of the practicalities of developing markets for heat.[90] In light of these studies, it is time for the Government to progress from analysis to action in promoting markets for heat, particularly from renewable sources, and we so recommend.

8.19.  Finally there is the issue of energy services. Experience elsewhere in Europe is that households and businesses connected into a community heating scheme tend to be so satisfied that they do not seek to change heat supplier. Therefore, even if the "28-day rule" applied to heat provision, users of community heating see themselves as participants in a long-term arrangement. This leads us to conclude that the energy service function could also be applied to community heating systems.

8.20.  An Energy Services Company (ESCO), in providing a range of energy management services, functions as the interface between the supplier of primary energy and the end user. Furthermore, because energy management is their business, ESCOs are inevitably aware of the life cycle costs of energy provision even where they may not be a high priority for building occupants and managers. An ESCO associated with a community heating scheme could in principle establish long-term contracts to provide services for a number of commercial and domestic premises, monitoring energy use, supplying both heat and energy efficient products, and so on, while purchasing primary energy from a range of sources. This would allow the establishment of an economic base large enough to be commercially attractive.

8.21.  In the case of Poseidon in Gothenburg, an ESCO has been able to design, build, finance and operate heat distribution systems, working with the local authority and the primary energy supplier to mutual benefit. In the case of the Berlin Energy Agency, application of the ESCO model has stimulated €37 million of private sector investment in energy saving measures, cutting the city's fuel bills and saving some 27,000 tC in emissions. We therefore welcome the announcement on 20 June that London is to establish its own Climate Change Agency, which, in the words of a press release, is intended to "establish itself as a municipal company—in partnership with private sector firms—which will design, finance, build and operate low and zero-carbon capacity".[91]

8.22.  We recommend that the Government explore the application of the Energy Services model to community heating. In particular, we believe that the establishment of the London Climate Change Agency offers a welcome opportunity to apply such a model on a large scale, with corresponding gains in energy efficiency and emissions.


80   Source: Dr Sinclair's paper, Table 1; Digest of UK Energy Statistics (http://www.dti.gov.uk/energy/inform/energy_stats/total_energy/dukes1_1_5.xls). See also paragraph 6.5. Back

81   Written answer by the Lord Sainsbury of Turville, 20 June 2005, WA 152. Back

82   See written evidence from Solar Thermal. Back

83   See in particular the 22nd report, Energy-the Changing Climate, 2000 (Cm 4749) and the special report Biomass as a Renewable Energy Source, 2004. Back

84   "Quantification of the Potential Energy from Residuals (EfR) in the UK", study by Oakdene Hollins Ltd., for the Institution of Civil Engineers and The Renewable Power Association, March 2005 (http://www.r-p-a.org.uk/content/images/articles/RPA&ICEEfRW.pdf). Back

85   See "A strategic review of the Community Energy Programme", Final Report to the Energy Saving Trust by IPA Energy Consulting and e2S Energy and Environment to Sustainability, December 2003.  Back

86   Source: ODPM: http://www.odpm.gov.uk/stellent/groups/odpm_housing/documents/page/odpm_house_604055.xls. Back

87   Biomass as a Renewable Energy Source, paragraphs 4.18-4.22. Back

88   "The UK Potential for Community Heating with Combined Heat and Power", study by BRE for The Carbon Trust, February 2003, reviewed November 2003. Back

89   The maps area available online at www.est.org.uk/communityenergy/ukpotential/heatmaps.cfm. Back

90   Ilex Energy Consulting, "Possible support mechanisms for biomass-generated heat" (December 2003); Future Energy Solutions, "Study of the economics of example CHP schemes" (July 2004). Back

91   See http://www.london.gov.uk/view_press_release.jsp?releaseid=5234. Back


 
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