Nov 2022 – A winter of blackouts? UK employers may need to prepare for electricity shortages

The National Grid has warned that households and firms across Britain could face repeated power cuts of up to 3 hours this winter. This article explores some of the issues for employers to consider ahead of this potential energy emergency.

Western Europe’s supplies of oil and natural gas are currently under significant strain due to the Russian invasion of Ukraine, contributing to mounting cost-of-living pressures. In its Winter Outlook Report, the National Grid Electricity System Operator has warned that in the “unlikely event” that insufficient gas supply coincides with reduced electricity imports from continental Europe, it could be forced to implement planned, temporary blackouts to manage demand.

In accordance with the Electricity Supply Emergency Code (ESE Code), these are expected to take the form of rotating, three-hour “disconnections”, in which consumers in particular localities (which might be a different locality each time) would be given a day’s notice that they would lose power. However, the length and frequency of any blackouts and the amount of notice that will be given to consumers ultimately remains unpredictable.

Preparation and planning

For the first time since the “Three Day Week” in the 1970s, UK businesses may find themselves unable to keep the lights on and key systems running at times this winter. This is unlikely to be as extreme as in the 1970s, when for two months all commercial use of electricity was limited to three days each week. But even short blackouts can cause significant disruption to businesses.

Employers should give careful thought to contingency planning, identifying any steps that can be taken to minimise disruption.

The practical impact on employers will vary depending on their sector and activities, as well as the frequency, duration and notice of any power outages. We expect that ensuring the resilience of IT servers and systems will be a priority for many companies. Manufacturers will face challenges such as keeping production lines and refrigeration systems running, while retail and hospitality may not be able to provide their usual services or even remain open at all.

The widespread move to remote and hybrid working may create additional challenges for employers. Workforces which increasingly rely on electronic communication and collaboration may struggle to work effectively – or at all – during power outages. Although, as the plan is for rotating blackouts in different regions, it is possible that only some rather than all homeworking employees will be affected at the same time.

Some practical steps that employers can take to minimise the impact are:

  • Adjusting working times, shift patterns or opening hours in order to accommodate a planned blackout. The ability to change working hours on short notice will depend on the wording of the contract, and this may not be possible for some employees who have commitments such as childcare or other caring responsibilities.
  • Investing in standby generators to maintain power supply for critical equipment or facilities.
  • Encourage employees to keep their devices fully charged while working in the office or from home, particularly if they have received prior notification of a blackout.
  • Advise employees on how to use their mobile phone as a Wi-Fi hotspot (assuming they have available data and the mobile phone network isn’t affected by the blackout). Employees may also be able to download or print out key documents in advance to work on without access to the internet.
  • Ask homeworking employees who are affected by a blackout to come into the workplace, if the workplace remains unaffected and transport is still running (which should be the case). This may not be possible for some employees who work from home for reasons such as childcare or other caring commitments.

What if the workplace has to close?

Rolling blackouts are likely to result in temporary periods where premises are closed or production lines are shut down. This may be because the employer cannot operate at all without electricity, or because it is unsafe to do so.

However, employers cannot just send most employees home without pay if a workplace is forced to close. In the event of an emergency temporary closure, most employees would be entitled to their normal pay unless you take steps to renegotiate this position.

The exception to this is the use of “lay-offs” or “short-time working” during affected periods. A lay-off is where an employer provides employees with no work or pay for a week or more, while short-time working occurs when an employee works only part of a week and receives proportionately reduced pay. With temporary blackouts of a few hours, short-time working is more likely to be relevant. However, employers will only be able to use unpaid short-time working lawfully where employment contracts give them a unilateral power to reduce working hours and pay, or with employees’ agreement. In workforces with a recognised trade union, short-time working is also likely to require notice to be given to the union.

However, most contracts will not cover this possibility (although it is slightly more common in some unionised industries). Imposing short-time working without contractual authority risks employees bringing claims for unlawful deductions from wages or resigning and claiming constructive dismissal.

An alternative is to ask employees to take annual leave for part or all of the affected days. However, the short notice of power outages means this is unlikely to be a practical option. It would also rely on employee agreement, as the employer is unlikely to be able to give the notice specified by the working time rules to require an employee to take holiday on a particular day (notice must be twice the length of the leave the employee is being asked to take).

Workplace Health and Safety

Employers should make sure that they consider any health and safety risks for their workforce (including those working from home) as part of their contingency planning for potential blackouts. Employers have a duty to safeguard their employees’ health, safety and welfare at work, as far as is reasonably practicable, including providing a safe working environment and systems of work.

Temporary losses of power may create additional and unusual health and safety risks, whether due to the loss of light, heating and/or cooling, failure of communications or sudden stoppages of equipment or machinery. Some employers may wish to use emergency generators, and staff will need to be trained on how to use these safely. If an employer intends to continue operating its workplace during blackouts, it is strongly advisable to carry out a detailed risk assessment which looks at how this will work in practice.

Employee consultation

Employees are likely to be anxious about the power blackouts and how it could impact their work, as well as their homes. It is advisable to keep the workforce informed about your plans. It’s likely that practical solutions can be found to many of the issues through discussion and consultation. Employees are also likely to feel reassured by an employer that plans ahead and communicates those plans clearly.

We all hope that Britain’s power supply remains resilient this winter. But if blackouts are needed, some preparation and planning now can help to lessen the impact on both the business and the workforce.

If you have any specific questions you would like advice on, then please contact: or of Lewis Silkin LLP.