Solar Century
How local
authorities can fuel the
solar revolution
of the 21st century
A Green Party
2003 local elections briefing
Dr Spencer
Fitz-Gibbon
With thanks to: Paul Ingram (Green Party spokesperson on local government and former deputy leader of Oxford city council), Chris Laughton (chair, Solar Trade Association), Christian Schmidt (Manchester Green Party), Solar Century (London SE1), Fuelmizas (Ribchester, Lancs), Sunseeker Ltd (Ashton-under-Lyne, Greater Manchester).
Contents
1. Introduction
p 2
2. Solar energy
today p 2
3. Germany's
(Green-led) environment ministry leads the world p 3
4. What Green
councils and Green councillors in the UK can do in the
coming
year and beyond p 4
Appendix 1:
Installation costs of solar roofs p 6
Appendix 2: Some
interesting facts about solar energy p 6
Notes p 6
Promoted and published by Spencer Fitz-Gibbon for The Green Party,
both at 1a Waterlow Road, London N19 5NJ.
1. Introduction
1.1 Solar power is an important
form of non-nuclear renewable energy. To reduce greenhouse gas emissions
sufficiently to avert the worst consequences of climate change, it will be
necessary to drastically increase the amount of solar energy we use. This
briefing addresses itself specifically to the use of solar collectors (panels
or tubes) fitted in domestic, small business and local authority contexts,
usually though not exclusively on rooftops.
1.2 Although much needs to be done by central government in
terms of renewable energy, there's a great deal that local authorities can do
to increase Britain's use of solar energy, and accordingly to reduce our
dependency on polluting, climate-changing fossil fuels.
2. Solar energy
today
2.1 Solar energy can be used
either for heating water or for generating electricity.
2.2 In a solar thermal system, a
panel (usually fitted to a roof, although it could be fitted to a balcony or
wall or be mounted on the ground) contains an array of water pipes. The sun
heats the water which is then transferred into a hot water store used in
conjunction with other energy sources such as a central heating system. The
solar pre-heating reduces the energy and expense involved in heating water, and
can cut water heating costs by 50%. [ 1 ]
Some very simple and inexpensive systems have been produced for directly
heating shower water.
2.3 Solar water heating systems
can cost as little as £2,500 to install, including labour and VAT, and will pay
for themselves within twenty years. [ 2 ]
2.4 Solar thermal systems can
generate heat from the sun even on less bright days. A larger solar water
heating system (say more than 10 square metres) could save over 30 tonnes of
CO2 during its lifetime. A system this large will also assist space heating on
some sunny but cold days in spring and autumn. [ 3 ]
2.5 Photovoltaic (PV) systems
generate electricity from sunlight, even on less bright days. A solar
photovoltaic tiled roof can save over 34 tonnes of greenhouse gas emissions
during its lifetime, providing electricity for 30 years or more.
2.6 A solar electric system
consists of products formed from light sensitive materials (photosensitive
semiconductors) which generate electricity when light falls on them. Direct
sunlight or heat is not necessary, so they can work even in cloudy weather. The
electricity produced can be used for anything which requires a conventional
mains supply. [ 4 ]
2.7 Solar electric systems provide
zero-emisions energy. [ 5 ] As well as helping reduce pollution and its
environmental impacts and hidden economic costs, solar roofs reduce electricity
bills and increase the value of a property. They are extremely low-maintenance
and have a functional life of thirty years or more. They are highly reliable,
silent in operation and visually unobtrusive. A solar electricity meter tends to
increase users' awareness of electricity consumption, and thus encourage
energy-efficiency in other respects. [ 6 ]
2.8 Solar roof panels could reduce energy consumption in most buildings -
homes, hospitals, business premises, council buildings etc - but solar roofs
(and similar stand-alone systems designed for ground use) have particular
applications in remote locations, where a solar installation is often a cheaper
solution than extending the grid, and provides independent and reliable power.
In off-grid situations, power is stored in batteries, backup can be provided by
a diesel generator, and hybrid systems combining solar and wind energy are
available, using small 400W turbines. [7]
2.9 Solar roofs can be visually
very appealing. [ 8 ] Glass laminates are available in a wide range of colours,
and provide insulation (they act like double glazing) as well as
electricity-generation. They use very high-quality heat-strengthened glass and
include a resin layer to make them shatter-resistant. The solar cells within
the laminates also have the beneficial side-effect of reducing glare. The
lamiates are made to order, and the customer can decide how much light to let
through. [ 9 ] Solar shingles can be fitted when re-roofing. They can replace
or be mixed with conventional (non-photovoltaic) slates. [ 10 ]
2.10 Fitting a solar roof need not
involve obtaining planning permission, which will only be necessary if the
panels project significantly from the roof slope. [ 11 ]
2.11 The Green Party believes we should be making the
fullest practicable use of solar energy - and that Britain is missing
opportunities to reap the social, economic and ecological benefits of solar
power.
3. Germany's
(Green-led) environment ministry
leads
the world
3.1 Germany, with a Green
Party-run environment ministry, is the world leader in solar power. Solar
thermal sales in Germany currently represent 50% of the annual EU collector
sales. [ 12 ]
3.2 In 1999, the federal German
parliament decided upon a programme to install solar power on 100,000 roofs.
This is being done by offering interest-free credit to home owners and small
companies, up to a maximum of 500,000 Euros. [ 13 ]
3.3 In 2001, 15,000 solar power systems were installed, producing a total of 75
megawatts. For 2002, the figure is expected to increase to 85 megawatts, giving
a national total of nearly 300 megawatts [ 14 ] - that's a doubling of solar
power within two years.
3.4 Also in 2001, about 100,000
solar-powered water heating systems were installed, with a total collection
area of nearly 1 million square metres. [ 15 ] As the world leader in solar
power, Germany's rooftops boast 4.3 million square metres of solar collector
area, growing by a million square metres per year and providing employment for
20,000 people. [ 16 ]
3.5 In 2000, the federal German parliament passed a new renewable energy law
that offers minimum prices for solar electricity (and other renewable energy)
fed into the federal grid. [ 17 ]
3.6 German government support for
renewable energies (including solar, biomass, geothermal, photovoltaic and
small-scale water power) will be 200 million Euro in 2002. In 2001, the German
renewable energy sector had a turnover of more than 6 billion Euro and provided
employment for more than 120,000 people. [ 18 ]
3.7 Further information (including in English) on the Green-run Federal
Ministry for the Environment can be found at www.umweltministerium.de .
3.8 The Green Party of England & Wales wants Britain to
follow and indeed surpass the German example.
4. What Green
councils and Green councillors in
the UK can do in the coming year and beyond
4.1 Green councillors can take the
lead in a number of ways:
a.
Ensuring maximum uptake of available
grants from central government. [ 19 ]
b.
Lobbying central government for the
grant scheme to be extended.
c.
Fitting solar roofs to council
buildings, including schools and libraries, benefiting from government grants.
d.
Fitting solar roofs on council houses
- potentially in a major programme fitting thousands of roofs over a period of
years. A council willing to cashflow such a programme could recoup the capital
costs by increasing the rent on the properties concerned during the requisite
payback period.
e.
Campaigning for law changes to oblige
all new homes and business premises to meet state-of-the-art energy-efficiency
standards, including solar roofs.
f.
Lobbying central government for a
strengthening of the Home Energy Conservation Act targets, giving councils
additional funding to help achieve demanding targets. Such a policy would
have aditional social benefits, including the creation of many thousands of
jobs and a significant reduction in most people's fuel bills. Funded by the
taxpayer, such a policy would ultimately pay for itself by reducing the hidden
costs of pollution from energy production - including health costs attributable
to pollution-related illness, and the colossal economic impacts of climate
change.
g.
Directly funding solar roof programmes targeted on less affluent sections of
the community. [ 20 ]
Appendix 1
Installation
costs of solar roofs
Table 1
Indicative
prices, Solar Century products [ 21 ]
Note: The quoted cost is for a
full installation and is fully inclusive of design, advice and installation of
the full system, and negotiations with your electricity network and supplier.
The average size of a domestic installation is 1-2 kilowatts.
Product Solar Shingles Terra Solar Solar modules Solar modules
and
SunSlates (crystalline) (thick-film)
Efficiency
(good light good excellent excellent very good
conditions)
Efficiency
(low light
conditions) excellent good good very good
Area needed 16 10 8
- 9 12
per kilowatt
(sq metres)
Approx cost £8,000 £10,500 £ 8,000 £8,000
per kilowatt
(full installation)
Table 2
Indicative
prices, varying sizes of solar PV installation [ 22 ]
Note 1: The prices outlined in the
guide table are for a full installation.The price varies according to the
product chosen (see Table 1). The size of the installation in square metres
will also vary depending on the product. A full installation includes system
design, fitting of solar product, installation of inverters and second meter,
negotiations with the electricity provider, and a guarantee covering at least
10 years.
Size of Installation Approx cost Approx
electricity units per year
(kWh)
kW sq m
1 10 £7,000-£8,000 760
1.5 15 £10,500-£12,000 1140
2 20 £14,000-£16,000 1520
2.5 25 £17,000-£20,000 1900
Note 2: For solar thermal, a full
installation includes system design, fitting of solar product, installation of
hot water store (if replaced) and a guarantee covering typically 5 years with a
life expectancy of 25 years. [ 23 ]
Appendix 2
Some interesting
facts about solar energy
[ 24 ]
A2.1 Power generated by
photovoltaics (PV) could provide 10,000 times more energy than the
world currently uses.
A2.2 If we covered a small fraction of the Sahara desert with PV, we could
generate all the world's electricity requirements.
A2.3 If you install a solar photovoltaic tiled roof, you could prevent over 34
tonnes of greenhouse gas emissions during its lifetime.
A2.4 Today all TV and communication satellites are powered by PV. In the
heavens there is no mains power, but the earth receives a continuous power
input from the sun of 200 x 1015 Watts - that's 200 followed by 15 zeros! An
unimaginably huge amount of energy which completely dwarfs the capabilities of
fossil fuels or nuclear fission... and it's clean and free.
A2.5 Two billion people on earth have no electricity. Typically their energy
comes from candles, kerosene and batteries. Often these monthly costs are
greater than the cost of a solar mortgage to pay for a quality solar home
system.
A2.6 Many buildings use cladding materials which cost £1,000 per square metre.
The bronze façade to the new Westminster parliament office complex cost over
£7,000 per square metre. By contrast, solar PV cladding - which can look every
bit as attractive as marble or bronze - costs as little as £500 per square metre.
It would also have provided clean and indeed free power for the building.
A2.7 PV provides power when you need it, where you need it. Caravaners,
campers, backpackers, climbers and outdoor enthusiasts can now have solar PV
power packs that fit in a rucksack, provide power for laptops, GPS devices,
music, light at night, and a charging point for mobile phones.
A2.8 Case studies of buildings using photovoltaics can be found on the Solar
Century website at http://www.solarcentury.co.uk/casestudies/.
1. Smart Energy website http://www.smartenergyuk.com/
says 40%. The Solar Trade Association says tyically 50%: communication with
author 23.4.02.
2. Solar Trade Association,
communication with author 23.4.02.
3. Solar Trade Association,
communication with author 23.4.02.
4. <http://www.solarcentury.co.uk/content.jsp?sectno=4&subno=11>
.
5. Making and installing solar
electric systems does of course use energy. But the energy pay-back time for a
panel - when it has generated as much energy as was used to produce it - is
between one and five years (depending on the type of panel). As panels have a
lifetime of approximately thirty years, the original energy cost is more than
compensated for. The 'thick-film' panel, made from recycled silicon, uses relatively
little energy during manufacturing. <http://www.solarcentury.co.uk/content.jsp?sectno=4&subno=11>
.
6. <http://www.solarcentury.co.uk/individual/>
.
7. <http://www.solarcentury.co.uk/content.jsp?sectno=4&subno=7>
.
8. See examples at <http://www.solarcentury.co.uk/content.jsp?sectno=4&subno=5>
.
9. <http://www.solarcentury.co.uk/content.jsp?sectno=4&subno=4&pageno=4>
.
10. <http://www.solarcentury.co.uk/content.jsp?sectno=4&subno=4&pageno=6>
.
11. DETR guidelines, Planning - A
Guide for Householders, section G: “you do not need to apply for permission for
the installation of solar panels which do not project significantly beyond the
roof slope.” Even if your home is in a conservation area this counts more often
than not. Free copies of the guidelines are available from 0870 122 6236. <http://www.solarcentury.co.uk/content.jsp?sectno=4&subno=11>
.
12. Website of the SolTherm Europe
Initiative, http://www.soltherm.org/. This source shows that:
a.
The sales of solar collectors in the EU in 1999 was 900,000 square metres,
leading to an overall installed collector surface of 9 million square metres.
In 1999, 90% of the sales consisted of flat plate collectors and 10% of vacuum
tube collectors.
b.
Market growth in 1999 and 2000 was approximately 10% per year. This means that
for 2001 the total installed area may be estimated at 11 million square metres.
c.
Since 1990, the average growth rate of the collector market was 13%, although
large differentiations were reported in this period.
d.
Since 1990, the average growth rate of the collector market was 13%, although
large differentiations were reported in this period.
13. Source: website of the Federal
Ministry of Environment.
14. Source: Bündnis 90 / Die
Grünen Bundestagsfraktion, Die Grüne
Umweltbilanz, Dec 2001.
15. B90/DG, ibid.
16. Source: website of the Federal
Ministry of Environment, www.umweltministerium.de.
17. Source: website of the Federal
Ministry of Environment, www.umweltministerium.de.
18. Source: website of Bündnis 90
/ Die Grünen.
19. The government announced in
March 2002 that it will put £20 million towards the installation of of solar
power systems in homes and offices around the country. The funding is expected
to increase domestic solar power installations in the UK tenfold.
Householders
and companies can apply for a solar power grant (NREL). The money is being made
available through the government's Major Photovoltaics Demonstration Programme
(PV MDP). The government also announced, around the same time, £4 million
towards photovoltaic projects for public buildings.
Grants
for domestic customers and small- and medium-sized enterprises (SMEs) are
likely to be around 50%, whilst those for publicly-run organisations, such as
education authorities, NHS trusts, and universities, are likely to receive
grants of around 65%. Large profit-making organisations are likely to receive
35% grants.
The
freephone number for the scheme is 0800 298 3978. The website being set up at www.solargrants.org.uk
is scheduled to be operable in the second half of April 2002.
20. District authorities have a
Renovation Grant system, whereby the government
allocates a certain proportion of their Revenue Support Grant to Renovation
Grants. These are never enough, so the authorities almost always have to top
these up considerably using their own capital reserves. These Renovation Grants
split down into mandatory (generally for alterations for disability
(Disabilities Facilities Grants) and discretionary, according to the local
need. These
grants are means-tested, and targeted at individuals who own their own homes
but cannot afford the structural changes, or to keep their property up (eg
elderly people with major home-renovation problems). These Discretionary Grants
could be used (and already are in some authorities) for energy efficiency
investment, like cavity wall insultation or loft insultation, though many
authorities use other pots of money for this purpose too. These monies could
also be used for grants to individuals for energy-generating projects, like
windmills.
21. See <http://www.solarcentury.co.uk/content.jsp?sectno=4&subno=4&pageno=5>
.
22. See <http://www.solarcentury.co.uk/content.jsp?sectno=4&subno=9>
.
23. Solar Trade Association,
communication with author 23.4.02.
24. Provided by Solar Century, <http://www.solarcentury.co.uk/content.jsp?sectno=0&subno=5>.
For further information on solar systems contact the Solar
Trade Association, National Energy Centre, Davy Avenue, Knowlhill, Milton
Keynes MK5 8NG.
Tel 01908 442290. Fax 0870 052 9194. www.solartradeassociation.org.uk.