Long before he became the Department for Energy and Climate Change’s chief scientific advisor, David Mackay lectured a course at Cambridge on how to perform back of the envelope calculations called ‘Order of Magnitude Physics.’ To teach the course, Prof. Mackay used a series of example calculations based on renewable energy. Little did I know that the examples he was using would later become part of a book he was writing (and little did he know of the fame and career change that it would bring) but it was listening to these lectures during my undergraduate that confirmed my ambition to work in the solar energy industry.

Already extremely concerned by the growing evidence for ‘human-caused’ climate change, Prof Mackay’s course taught me some astonishing facts, such as how the amount of solar energy delivered to the Earth is ten thousand times the total amount of energy we use over the course of a year. He made me realise that human civilisation has a huge amount of work to do to halt its greenhouse emissions, but he also gave me the hope through new technologies, we really can wean ourselves off fossil fuels without impacting our quality of lives too severely.

After a PhD and several years working in solar photovoltaics for a large company in Germany, I returned to the UK and was astonished to find that the Government has extremely low ambitions for solar energy and even more astonished that it is using David Mackay’s analysis, at least in part, to justify this. At present, the Treasury’s £360m cap on Feed-in tariffs means that support for solar PV at all scales will end by mid-2012 and limit solar PV capacity in the UK to less than 3% of Germany’s current installed base.

When I re-read Mackay’s key book ‘Sustainability Without the Hot Air,’ I find it paints a very compelling argument for solar energy. Prof Mackay repeatedly points out that solar energy can deliver far more energy than any other renewable energy technology in the UK, as illustrated by the fact that the amount of solar energy we receive in the UK is fifty times the total amount of energy we use, including transport and heating. At the time of writing, David Mackay singled out two hurdles for widespread solar adoption in the UK; cost and space. It seems as though these hurdles have been interpreted by the Government as insurmountable barriers, whereas careful re-examination of these hurdles using up-to-date figures reveals them to be significantly less onerous than Mackay first assumed.

In relation to costs, David Mackay states ”it will be wonderful if the cost of photovoltaic power drops in the same way that the cost of computer power has dropped over the last forty years.” This is exactly what has been demonstrated over the last 5 years. Jenny Chase, a solar energy analyst at the research firm Bloomberg New Energy Finance claims “In 2011 we expect an oversupply of solar panels which will put continued downward pressure on system prices.” In his book, David Mackay uses a solar electricity cost of €0.25 per kWh which is 4 times current wholesale electricity costs, but only twice the price of retail electricity, and seeing as prices have continued to fall exponentially since the time of writing in 2008 we can expect this gap to be closed fast. In fact, the cost of solar energy is falling much faster than that of any other energy technology to the point where it is the expected to compete with unsubsidized retail electricity prices in UK latitudes by 2014/2015 [1]. In contrast, the cost of nuclear energy has risen 5 fold since 1970 according to a recent study by Yale University’s Arnulf Grubler [2]. By supporting the solar industry now, it will soon be able to support itself without subsidy.

Digging deeper into the Government’s original modelling of overall ambition for PV, the Renewable Energy Association has found that a mid-range future fossil fuel price scenario was used which assumes a cost of $80 per barrel of oil in 2020 (which is unlikely considering current prices are frequently above $100). By using such unrealistic forecasts, the value of investment in solar energy is being systematically undervalued.

The second issue that Prof Mackay raises is with the amount of area required to get large amounts of solar energy. Whilst there is a vast amount of solar energy available to us in the UK, that energy is disperse, meaning you do indeed need to cover a considerable area in solar panels to cover our electricity needs. Prof Mackay points out that to get our current electricity (50 units of electricity per person per day) needs would require 200m2 per person. This is a huge amount of area, but it’s important to realise that reaching that target is highly plausible. The total amount of roof space per person in England is 47m2, domestic gardens 114m2, and roads and open spaces make up 60m2 and 2300m2 per person respectively [3], so by using a proportion of roof space and a small proportion of open space we could certainly get close to 200m2. Its important to point out that open space does not mean prime farmland, there are many brown field sites that could be put to good use. Nor do solar panels on open space prohibit the use of that land for other means. When placed in fields for example, solar arrays can still permit some animal grazing and in other countries, solar arrays are often positioned along motorway banks or as canopies above car parks.

Obviously getting between 100m2 and 200m2 of solar panels per person in the UK would be a gigantean undertaking and one that would change the look of our country, but this would be just one of a long line of gigantean undertakings that have taken place in our history. The expansion of organised farming, the construction of road and rail networks, and more recently the construction of electricity and mobile phone grids were all projects that have profoundly changed our country and its appearance. Just because the task may be large, does not make it impractical. In the UK we happily resurface 60m2 of road per person every 5-10 years.

Solar energy has already proven itself highly popular in the UK. It is one of the few technologies that can be produced effectively on a domestic scale giving power to families to generate their own electricity. Solar energy can also be deployed staggeringly quickly. In 2010 alone Germany installed 8GW of solar energy distributed among over 200,000 individual installations. That is equivalent to over two nuclear power stations, and there is no way those nuclear power stations could be built so quickly.

There is a misconception that micro-generation does not result in large amounts of energy, but multiplied thousands of times, the amount of energy we can harvest from small solar installations is enormous. The UK will of course need a balanced mix of different energy technologies, but lets give solar its rightful place alongside the other major forms of energy generation. As Prof Mackay points out; ‘to complete a plan that adds up, we must rely on one or more forms of solar power. Or use nuclear power. Or both.’

1. AT Kearney Report; ‘The True Value of Photovoltaics for Germany’ 2010
2. Arnulf Grubler, Yale University; ‘The costs of the French nuclear scale-up: A case of negative learning by doing’ Energy Policy, 2010
3. Department for Communities and Local Government, Land Use Statistics (Generalised Land Use Database) 2005, www.communities.gov.uk/publications/planningandbuilding/generalisedlanduse

Dr Toby Ferenczi

The UK is in the midst of a race to install solar PV on its roof-tops from domestic dwellings to schools, hospitals, council buildings and agricultural sheds.  All this is being driven by the Feed- In-Tariff (“FIT”) that has been put in place since April 2010 by the UK Government, to support renewable energy generators to invest in technology such as solar PV.  The FIT provides an index-linked subsidy for power generated for 25 years, providing an ideal investment asset for pension funds and long-term investors.

Whilst roof-top solar no doubt has its place, an innovative company based in Scotland and Somerset, SolParks, has looked further afield and brought another variant of solar PV to the UK market – the solar car canopy.

The solar canopy is a structure built over a car parking space with solar PV panels mounted on its top. The canopies bring a number of direct user benefits such as shelter in poor weather, keeps cars shaded from the heat of the sun and can add further to user amenity, by adding in electric vehicle charging points (powered by renewable power, rather than mains) and using LED lighting under the canopies, which can be sensor operated, rather than large street lighting, to provide bright, safe car parking.

The power generated by the solar PV can be supplied direct to the car park owner, or can be supplied to the national grid.

The environmental and user benefits are obvious but also extend to easing legal issues between landlord and solar PV operator.

Elliot Roe of Solparks says “we researched the market for more innovative solutions for solar PV and found car park canopies in both France and USA, where the markets are far larger.   The benefits in the UK are obvious as well and we are innovating even further by using the FITs to enhance the financial benefits for users.”

Solparks is looking for installations of 12 car parking spaces up to 100.   Roe goes on to say “we can provide the installation to a site owner without any cost to them.  We undertake the planning consent, construction works, grid connection and pay for the canopies and solar PV.  The user in return receives discounted power and gains the benefits for their car park users.   The power they can’t use on site is exported to the grid.”

Using the power generated from solar PV on site can save the landowner power costs and can provide a valuable hedge against the threat of rising electricity prices. It also sends a strong, visible, message to customers about green credentials.

Roe says “ we are happy to work with any size of car park owner; however, an ideal customer would be one with multiple car parks. That way the customer achieves wide spread benefit, and the amount of power generated becomes a meaningful contribution to reducing their power bills.”

Solparks feels its solution offers much more simplicity for building owners.  The solar PV doesn’t compromise the core building, no structural surveys or reinforcements are needed and we can also accommodate re-development much more readily.

So why, given all these advantages, is the product limited to 100 spaces in any one location ?  Roe comments that “the changes in the FIT from 1 August make it very difficult, with the FIT alone, to achieve the sorts of levels of returns that are needed to fund a roll-out on a larger scale.  There are other commercial solutions that could be looked at to achieve much larger deployments however and we would be delighted to hear from any potential Solparks customer”

Solparks provides a fully turn-key service to those wanting to purchase rather than lease.  The service includes planning, grid connection, Ofgem accreditation, procurement of all materials and onsite installation. Solparks can also provide an ongoing operation, maintenance, monitoring and reporting service.

The Solparks product comes with a full 25 year warranty over the steel and PV installations plus a 2 year workmanship warranty.

And what of electric vehicle transportation ?    Solparks believes solar car parking can play a large role in the infrastructure needed for electric vehicles – both cars and scooters.    Roe says “adding charging points below the canopies, powered by the sun, is an easy next step and can provide further amenity to customers”.

Given the benefits, we expect to see many Solparks installations starting to appear, and provides large car park owners with another potential revenue stream from an asset that they already own.

For more information email elliot@solarfeedintariff.co.uk

Despite the uncertainty surrounding the UK solar photovoltaic industry, the fact remains that with the feed-in tariff in place in any form, there will continue to be a market for investors. The coalition government has announced that they will be changing the feed-in tariff to focus on smaller scale, roof-mounted solar installations to the detriment of large scale solar farms.

However, for those installing solar pv panels, there are still very healthy returns to be had from the payments which come from the feed-in tariff scheme something which Eco Environments believe is the main catalyst behind the growth of the industry in the UK.

There is a very evident media focus on climate change and the resulting political rhetoric which follows and also, a growing culture of awareness in green energy, recycling and the need to dramatically reduce carbon emissions on a domestic level. David Hunt of Eco Environments believes however that the growing interest in installing household, roof-mounted solar panels comes not from a desire to be environmentally friendly but from the commercial advantages which come as part of the feed-in tariff.

Hunt believes that,

“Most people are looking at it now domestically because they are going to get two or three per cent on an ISA or out of the bank account, but with the solar they can get 15 per cent”.

At a time where it is very hard to find savings accounts offering attractive interest rates and there is a worldwide lack of confidence in traditional investment opportunities in the stock market, it is perhaps unsurprising that the great majority of people look to install solar panels for purely financial reasons. After all, while it is the government’s business to meet carbon reduction targets and appear to be environmentally friendly, it is the homeowners business to dramatically reduce their utility bill while hopefully creating a very steady revenue stream on the side

It is unsurprising that the man who headed the Department of Energy and Climate Change (DECC) when the feed-in tariffs were announced under the previous government has joined the campaign against making cutbacks to the feed-in tariff. Ed Miliband now leader of the opposition has come out in favour of maintaining the current rates paid to solar projects regardless of scale.

Greg Barker is in favour of reducing the feed-in tariffs for larger scale solar farms to ensure that investment is focused on solar rooftop installations rather than large scale solar farms which have sprung up in order to take advantage of the tariff payments. The coalition government has maintained that in order for household solar projects to be successful, a cap on payments will be introduced for all solar projects over 50kw capacity, making large scale solar farm projects financially unviable.

Miliband showed his opposition to proposed cuts by signing an early day moton with a view to provoking a debate in parliament to highlight the reasons for maintaining the solar feed-in tariff for all projects. A Labour Party spokesman commented that,

“There has been no real debate about this significant change and we want to see it debated properly at the committee level.”

The feed-in tariff works by offering guaranteed, premium rates for units of energy both used and fed-into the grid by solar photovoltaic generators. The feed-in tariff mechanism was introduced as a way of making solar projects more commercially viable by off-setting the obvious set up costs in installing solar pv equipment. Therefore, the proposed 40-70 per cent cuts for installations over 50kw could prove disastrous for larger schemes as investors are turned off by a lack of returns.

Shadow climate minister, Huw Irranca-Davies echoed the leader of the party stating,

“Minister Greg Barker’s decision to go ahead with the proposed dramatic Feed-In Tariff reductions for community, school and hospital schemes, is a big blow to British industry and betrays the government’s promise the be ‘the greenest government ever.”

Adding, “A decision such as this which fundamentally alters the future for the solar industry in the UK deserves real debate, where MPs can question the Minister on his rash and ill-thought out decision. It should not be snuck quietly through the Commons.”