Power Line Technology Devices

Jim Shannon Excerpts

Wednesday 18th May 2011 Commons Chamber

[Mark Lancaster (Milton Keynes North) (Con)]

It is a pleasure to introduce this timely and important debate in the House. Hon. Members who are intrigued by the title will perhaps read the first paragraph, so I should sum up the debate by highlighting my concern, and that of many organisations: Ofcom, and indeed successive Governments, have adopted a reactive approach to the increasing interference from power line technology devices. We urge the Government to take a more proactive approach.

The area that I represent could be deemed to be the home of radio communication. Milton Keynes, which includes the famous code breakers’ base Bletchley Park, was integral in intercepting enemy messages during the second world war. The city is surrounded by listening stations—one of which, the Foreign and Commonwealth Office’s Hanslope Park, continues to protect our country to this day.

Radio is paramount not just in preserving national security; nor is it merely the preserve of outposts around Milton Keynes. Across the world, such technology remains essential to all communication. The spectrum is invaluable in so many ways: to television, radio, mobile phones, the emergency services, the military and security services, hospital pagers, pilots’ landing systems, and many more.

Shortwave radio has proven time and again to be a vital back-up when other communication systems crash in the aftermath of natural disasters or terrorist attacks. For example, radio was used in the immediate aftermath of the attack on New York on 9/11, and in 2005 radio was used to co-ordinate the relief effort following Hurricane Katrina. However, there are fears that the efficiency of radio communication is being jeopardised by the development of new technologies, specifically those known as power line telecommunication devices. PLTs use a home’s mains electricity wiring to route internet and television around a household without using a data cable. As electricity wiring was not designed to carry radio signals, an unwanted by-product—interference—is emitted. That rasping hiss has the power severely to disrupt radio communication.

GCHQ, the BBC, the Civil Aviation Authority and even NATO are some of the bodies that have spoken out about PLTs’ power to interfere with, and therefore impede, their highly essential work. We and our constituents might never have heard of PLTs or the noise they emit, but every single one of us is affected by, and relies on, radio, so this debate is relevant to us all.

As I said, PLT devices use the radio spectrum to send data signals via mains electricity supplies, and tend to come in the form of large mains plugs that can share the internet between computers or high-definition television between rooms, providing an alternative to lots of cables in the home. Most commonly they are provided by BT Vision packages, and it is estimated by the regulator Ofcom that there are about 1.8 million pairs of the equipment in use. In fact, the UK is one of the biggest users of in-home PLT devices in Europe. As mains wiring was not designed for carrying radio signals, PLTs cause it to leak radio signals into the air. All appliances leak interference to some extent, but when electric wiring is used to carry broadband, the levels of interference become a significant problem.

I have met constituents who are experts in the field. They can walk down the street with a radio and pinpoint which households are using PLT devices just from the noise emanating from the buildings. We are talking about the pollution of the 21st century. In previous centuries, we have fought smog with campaigns for clean air, and now we are seeing a battle for clean airwaves. My constituents are not alone in their concerns. As I said, there is a chorus of consensus on this issue. The Civil Aviation Authority has expressed concerns about the threat posed to its instrument landing systems. One briefing note states:

“The CAA is concerned that interference originating from the legitimate operation of PLT could adversely impact aeronautical critical systems. Furthermore, it appears that should this occur, it may not be possible to resolve in a timely and safe manner.”

Even if the effects of the PLT are mitigated—I will come to that later—the probability of interference is reduced to 1%, which might sound low, but in aeronautical terms it is still a significant safety risk. The threat posed to aircraft safety by radio interference has been taken very seriously in the past. For example, in October 2009, in my neighbouring constituency of South West Bedfordshire, Ofcom paid a visit to 12-year-old Nickie Chamberlain in Leighton Buzzard. His TV booster aerial, which was faulty, was emitting interference that caused pilots at nearby Luton airport to complain. Ofcom acted quickly.

Even NATO has investigated the effects of PLTs on its equipment. One report states that the noise coming from PLT devices

“has the potential to cause problems for military HF (high frequency) radio communications and communication intelligence in all NATO countries”.

The Radio Society of Great Britain has been highlighting concerns about PLTs’ unwanted noise for 10 years. It clearly states that

“it will not be possible to recover the damage done to the spectrum unless action is taken very quickly”,

and that this “invaluable natural resource”—the spectrum—

“is being consigned to history”.

The BBC has also commissioned investigations into the effects of PLT devices. The most recent, published in March, described the “tearing” sound of the PLT, which at best was annoying and at worst made a broadcast programme incomprehensible.

However, the most damning indictment so far has come from GCHQ, which deemed PLTs

“likely to cause a detrimental effect to part of the core business of this Department.”

In a statement issued on 10 March, it concurred with others’ view that the interference from these devices

“was likely to pose a safety of life risk”.

It concluded that PLTs

“should not be available for sale/use within the EU”.

However, when I asked, in a written question, for the Minister’s opinion on that statement, I was informed that it had, intriguingly, been withdrawn. Just as PLTs have an odd effect on surrounding radios, the issue has had a curious effect on the associated authorities. GCHQ, as I said, expressed an unequivocal stance on the issue, but then withdrew it. Ofcom, too, is behaving rather strangely.

All electronic devices must adhere to the essential requirements—the Electromagnetic Compatibility Regulations 2006—which are based on the European electromagnetic compatibility directive. Ofcom was advised in a report it commissioned by ERA Technology in September 2008 that:

“It is considered that the Ethernet Power Line Adapters do not meet the Essential Requirements of the EMC Directive; emissions could potentially cause interference to communications equipment.”

However, Ofcom maintains that PLTs are not in breach, because it has investigated 227 complaints, and all but one have been resolved by BT engineers. There are, however, many problems with this methodology. First, these are isolated cases and small-scale investigations. However, the report bases findings on results from scientific experiments in the controlled conditions of electromagnetic compatibility test laboratories.

Secondly, as I hope my hon. Friend the Minister will agree, complaints tend to represent the tip of the iceberg. If one receives 10 complaints about an issue, they are likely to be indicative of scores of other qualms. Thirdly, what has happened shows that Ofcom is taking a reactive and not a proactive approach. Rather than heeding its own commission’s report, which says that PLTs do not comply with the directive, and then seeking out breaches, it is relying on people to approach the regulator. Why is Ofcom judging PLTs’ compliance not by the results of scientific experiments, but by the number of complaints that it has received? What other industry would prove the regulatory compliance of its products in that way?

The crucial point for my constituents is that Ofcom says that there are no relevant standards when it comes to PLTs and that it is waiting for the EU to formulate a “harmonised standard”. The Minister recently told me in answer to a parliamentary question:

“The Regulations do not set specific levels of interference”.—[Official Report, 10 March 2011; Vol. 527, c. 1199W.]

However, there is a standard: EN 22022, which is listed under the EU electromagnetic compatibility directive—or EMC directive—for controlling interference from data communication products such as PLTs.

[Jim Shannon (Strangford) (DUP)]

The hon. Gentleman has mentioned health and safety on a number of occasions in his presentation to the House this evening. Does he see local government as having an enforcement role in responding to health and safety issues?

[Mark Lancaster]

The hon. Gentleman makes a valid point that perhaps the Minister will address when he winds up.

The EN 22022 standard includes a threshold that has been agreed internationally for decades, and the ERA test report said that PLTs exceeded it. In fact, the acceptable level of interference was surpassed by 30 dB. I am told that that equates to 1,000 times the interference power that any other domestic product is permitted. Why are we waiting for a new standard when there is already one in place?

Another problem is that Ofcom is basing its stance on the current situation, not future projections. However, the interference caused by PLTs is set to get worse, for various reasons. First, more and more people will sign up for television and internet packages that use PLTs, which are set to figure highly in the YouView package due to be launched next year. One report, which I will discuss shortly, estimates that the number of PLT users per square kilometre will increase from 159 in 2010 to a massive 703 in 2020. Secondly, as different PLT manufacturers compete to provide better services the interference will get worse, because they will be using a greater part of the spectrum. They are already veering into the very high frequency range, which has reportedly increased interference. Thirdly, PLT devices are being discussed as a way of communicating information about energy usage as part of smart grid technology, or as a way of providing data-linking between appliances around a house.

Ofcom’s stance on PLT devices is also at variance with the conclusions of a report that it commissioned PA Consulting Group to undertake in June 2010. Ofcom claims that the current situation is acceptable because there are fewer complaints, in spite of a higher uptake of PLT units. Conversely, however, the PA report said:

“there will be a high probability of interference to some existing spectrum users…if PLT device features do not change from those currently implemented”.

PA recommends that in future, inference will be staved off only if devices are manufactured with mitigating features such as power control. I would be grateful if the Minister could say whether that has been put in place. PA also says:

“notches in the VHF aeronautical radio navigation bands should be mandated”.

Does the Minister know whether that has taken place? If mitigation is so essential, what does Ofcom propose to do about devices that are already in use—the ones that are circulated second hand or manufactured abroad, none of which will have mitigating technology? The PA report warns:

“it should not be assumed that the existing installed base is traceable or could be updated to incorporate these features”.

Moreover, what investigations have taken place into the efficacy of notching, considering that it is disputed whether this technique actually works? The Radio Society of Great Britain says that these technologies are “unproven” and that

“in the home their effectiveness in reducing interference to radio services will be much reduced”.

I would like to know whether the Minister has liaised with his colleagues heading up the excellent Digital Britain initiative. The current fibre-to-the-cabinet broadband upgrades that are being rolled out—some in my constituency, which is very welcome—share part of the same spectrum as PLTs. A report by the European Telecommunications Standards Institute showed that PLTs can interfere with this new technology. BT may well be rolling out products that do not work alongside each other.

The problem is not without precedent. Every time a new technology is introduced, it impacts on existing technology, not least in the world of radio communications. In the early 1890s, spark transmitter radios were all the rage, until the cacophony became overpowering and legislation had to be introduced. Fifty years later, when cars and televisions were new and exciting inventions, people’s television pictures could be distorted by the spark plugs of a passing car. Soon after, suppressors were introduced for all cars.

In 2011 we are replete with electronic devices. We want to do everything faster, and simultaneously. We want to watch our high-definition televisions while surfing the net and using our smartphones. The radio waves are crowded, competing with one another. We have an electromagnetic compatibility directive that has hitherto kept interference in check. The Department says that the directive does not specify acceptable interference levels, but the standards that it lists do, and experts in the field have been using them for many decades. The aforementioned ERA report shows that PLTs inherently breach that threshold.

Ofcom seems to place great importance on the fact that the complaints have been received from users of shortwave broadcasts and hobby radio users, but the security services can pick up the shortwave broadcasts of terrorists, pilots use shortwave broadcasts to help them to land their aircraft, and ships have sent distress signals half way across the world using these frequencies. We need to clear the way for such essential radio messages to be made or traced, and not allow their paths to be blocked by radio pollution.

Will the Minister acknowledge that this is an issue of great concern? Will he promise to base his stance on PLTs not merely on the number of current complaints, but on the results of scientific experiments, on the conclusions of expert reports based on well-established interference limits, on the strength of feeling from experts in the field, and on the projections for the future number and usage of these devices? Will he also instigate some form of market surveillance? Instead of reacting only to individual complaints, will he initiate a holistic assessment of the proliferation of PLTs? Will he reconsider the fact that there are thresholds in place for interference, and that PLTs currently do not meet those standards? Finally, will he liaise with other Departments to press for category 5 broadband cables to be installed in all new homes as standard? This whole issue strikes me as a result of short-termism, with homes having to be retrofitted with technology. There is no reason why we should not plan ahead and create a suitable data infrastructure, rather than continuing with unsuitable piggybacking on existing technology.