Power Outages & Production Loss: Business Interruption Explained

Introduction: why a power cut becomes a profit problem

A power outage is rarely “just” an inconvenience. For many UK businesses it can mean halted production lines, spoiled stock, failed IT systems, missed delivery slots, contract penalties, and a backlog that takes days (or weeks) to clear.

That’s the gap Business Interruption (BI) insurance is designed to address: it helps replace lost income and pays certain extra costs while you recover from an insured event.

In this guide we’ll break down what BI is, how power outages fit into the picture, and what you should check in your policy if your business relies on continuous power.

What is Business Interruption insurance?

Business Interruption insurance (also called Loss of Profits cover) is typically part of a Commercial Combined policy, a standalone BI policy, or included within some packaged business policies.

At a high level, BI is intended to put you back into the financial position you would have been in if the loss had not happened.

BI usually covers two main areas:

• Loss of Gross Profit / Loss of Revenue: the shortfall in turnover during the interruption period, adjusted for saved costs.
• Increased Cost of Working (ICOW): extra costs you reasonably incur to keep trading or to reduce the loss (for example, hiring generators, outsourcing production, paying overtime, or renting temporary premises).

The cover only responds when the interruption is caused by an insured peril and the policy conditions are met. That’s why power outages can be tricky: the cause of the outage matters.

Power outages: the common ways they hit production

Power loss affects different businesses in different ways. Typical impacts include:

• Production lines stop immediately (machinery, conveyors, robotics, compressed air systems).
• Quality issues (incomplete processes, temperature changes, calibration drift).
• Spoilage and wastage (refrigerated goods, pharmaceuticals, chemicals, food production).
• IT and data disruption (servers down, network equipment offline, corrupted files).
• Safety shutdowns and restart delays (controlled restarts, inspections, revalidation).
• Supply chain knock-on (missed collections, late deliveries, contractual service levels).

Even a short outage can create a long interruption if you need to:

• re-run batches
• re-sterilise equipment
• re-test product
• wait for engineers
• source replacement parts

The key question: what caused the outage?

BI cover is not “power outage cover” by default. It is usually “interruption following insured damage.” The trigger is often physical loss or damage at your premises caused by an insured peril.

Here are the most common scenarios:

1) Damage at your premises causes the outage

Example: an electrical fire damages your switchgear, or a storm damages your incoming supply equipment.

If the damage is covered under your property section (e.g., fire, storm), BI may respond because the interruption follows insured damage.

2) Failure of the public electricity supply (off-site)

Example: a regional grid issue, a substation failure, or damage to overhead lines away from your premises.

This is where many businesses assume they are covered but aren’t. Some policies include Public Utilities or Failure of Public Supply extensions, often with:

• a waiting period (e.g., 12, 24, or 48 hours)
• a sub-limit (lower than your main BI sum insured)
• restricted perils (e.g., only if the failure is due to an insured peril like storm)
• a defined radius (e.g., damage within 1km of the premises)

3) On-site equipment breakdown (no external damage)

Example: your transformer fails, your UPS fails, or a critical motor burns out.

Standard property/BI may not respond if the cause is mechanical or electrical breakdown without an insured peril. This is where Engineering / Machinery Breakdown and Machinery Business Interruption (MBI) can be important.

4) Planned outages or load shedding

Planned maintenance by the network operator, or scheduled shutdowns, are usually not insured.

Understanding the BI “indemnity period” (and why it matters)

The indemnity period is the maximum time the insurer will pay for BI losses following an insured event. Common indemnity periods include 3, 6, 12, 18, 24, or 36 months.

If you’re a manufacturer, a longer indemnity period can be critical because recovery isn’t always immediate. Consider:

• lead times for replacement machinery
• specialist installation and commissioning
• regulatory approvals (where relevant)
• customer re-onboarding and order pipeline rebuild

A short indemnity period can leave you under-protected even if the initial outage only lasted a day.

What BI typically covers after an insured event

While wordings vary, BI often includes:

• Loss of Gross Profit during the interruption
• Standing charges (fixed costs you still pay, like rent, finance, key salaries)
• Increased Cost of Working (temporary power, overtime, outsourcing)
• Accountants’ fees for preparing the claim (sometimes included)

Some policies also offer extensions such as:

• Denial of Access (e.g., police cordons after a nearby incident)
• Loss of Attraction (for certain sectors)
• Supplier/Customer extensions (interruption due to damage at key suppliers or customers)

For power-outage risk, the most relevant are usually:

• Public utilities / failure of supply
• Service media (electricity, gas, water, telecoms)
• Contingent BI (supplier/customer)
• Machinery Breakdown + MBI

The exclusions and limitations to watch for

This is where policies differ most. Common limitations include:

Waiting periods

Some BI extensions only start paying after a set time. If you have a 24-hour waiting period and your outage lasts 10 hours, you may receive nothing under that extension.

Sub-limits

Your main BI sum insured might be £500,000, but the public utilities extension might be capped at £25,000 or £50,000.

Restricted causes

Off-site supply failure might only be covered if caused by:

• fire
• lightning
• explosion
• storm
• flood

If the failure is due to equipment breakdown at a substation, the wording may not respond.

Wear and tear / gradual deterioration

If the root cause is maintenance-related, insurers may decline under standard property damage sections.

Cyber-related outages

If the outage is caused by a cyber incident (for example, ransomware affecting a supplier or utility), cover depends on your cyber policy and the BI wording. Many property policies have cyber exclusions.

Utilities at your premises

Damage to your own electrical installation may be covered under property, but pure breakdown may require engineering cover.

Production loss: how BI claims are calculated (in plain English)

BI claims can feel complicated, but the logic is straightforward:

1. Establish the expected turnover for the affected period (what you would have sold if the outage hadn’t happened).
2. Measure actual turnover achieved during the interruption.
3. The difference is the shortfall.
4. Adjust for saved costs (costs you didn’t incur because you weren’t producing).
5. Add increased costs of working that are reasonable and help reduce the loss.

Good records matter. The smoother claims tend to involve:

• clear production logs
• order books and delivery schedules
• stock records
• management accounts
• evidence of mitigation steps (quotes, invoices, emails)

Real-world examples of power outage BI scenarios

Example A: manufacturing line shutdown

A manufacturer loses power due to a fire in an on-site electrical panel. Repairs take 5 days. Restart and revalidation take another 3 days.

Potential BI impacts:

• lost output and delayed orders
• overtime to catch up
• outsourcing part of production

If the fire is an insured peril, BI may respond for the interruption period (up to the indemnity period).

Example B: regional outage (off-site)

A business loses power for 36 hours due to a substation failure. No damage occurs at the insured premises.

Whether BI responds depends on whether the policy includes failure of public supply, the waiting period, and the wording around the cause.

Example C: equipment breakdown

A transformer fails due to internal fault. No fire, no external damage.

Standard property/BI may not respond. Engineering and MBI cover may be needed.

How to reduce downtime (and improve insurability)

Insurers like to see practical resilience. It can also reduce your loss and help your claim.

Consider:

• UPS and surge protection for critical IT and control systems
• Generator capacity planning (what must stay on vs what can wait)
• Fuel contracts and safe storage arrangements
• Preventive maintenance for switchgear and transformers
• Thermal imaging and electrical inspections
• Documented restart procedures and supplier engineer contacts
• Spare parts strategy for long lead-time items
• Supplier diversification (especially for outsourced processing)

If you operate in regulated sectors (e.g., medical devices), build in time for revalidation and document it.

Choosing the right BI limits and indemnity period

Two common BI problems are:

• Underinsurance: your gross profit sum insured is too low.
• Indemnity period too short: you run out of time before you fully recover.

A practical approach:

• review your last 12 months turnover and gross profit
• model a worst-case outage scenario (including restart delays)
• consider peak trading periods
• factor in supply chain and specialist replacement lead times

If you’re unsure, an insurance broker can help you stress-test the numbers.

What to ask your broker (power-outage checklist)

Use this checklist to sense-check your cover:

1. Do we have Business Interruption cover, and what is the indemnity period?
2. Is BI triggered only by damage at our premises, or do we have failure of public utilities cover?
3. What are the waiting periods and sub-limits for utilities extensions?
4. Is machinery breakdown covered, and do we have Machinery BI?
5. Are data, cyber events, or telecoms outages excluded under property/BI?
6. Do we have supplier/customer extensions if a key third party loses power?
7. Are we correctly insured for gross profit (not just turnover)?
8. What evidence will we need to support a claim?

When BI won’t help (and what might)

BI is powerful, but it’s not a cure-all. If your outage is:

• planned
• due to non-insured causes under your wording
• shorter than the waiting period
• outside the extension radius

…then you may not be covered.

Depending on your risk profile, alternatives or additions may include:

• Engineering/Machinery Breakdown + MBI
• Cyber insurance with BI elements
• Contractual protections and service level agreements
• Operational resilience measures (generators, redundancy)

Conclusion: protect cashflow, not just buildings

Power outages are a classic example of a loss that can be financially severe without leaving obvious physical damage. That’s why it’s worth reviewing your BI cover with power loss in mind: the trigger, the extensions, the waiting periods, and the indemnity period.

If you’d like, share your business type (manufacturing, warehouse, office-based, retail, etc.) and how long you could realistically operate without power. I can help you shape a simple “power outage BI” paragraph for your website and a checklist you can use when speaking to insurers.

Call to action

If you’re reviewing your Business Interruption cover or you’ve had a near-miss power outage, Insure24 can help you sense-check your protection. Call 0330 127 2333 or visit insure24.co.uk to discuss Business Interruption insurance tailored to your business.