LPS 1175 SR3 on the new substation builds. SR4 on the CPNI-listed sites. SR2 with anti-cut detail on the remote rural kiosks. EV charging hub enclosures rolling out across the network. We manufacture the steel core for the doors and windows protecting every layer of it.
Utility estates are the growth sector for security manufacturing right now. The grid is being rebuilt around renewables, EV charging hubs are being deployed at retail scale, and the threat profile has hardened across the board. SR3 was once a deliberate spec uplift. It’s now the new floor.
Fort Engineering manufactures for distribution and transmission network operators, water utility estates, gas distribution, and the EV charging operators building out new hub networks. Same factory, same engineering team, same certification scheme for a single substation upgrade as for a fleet roll-out of 200 EV hub enclosures.
The site type differs. The manufacturing standard does not.
FE/UTI-01
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Threats and response
The three site categories that drive most utility procurement, and the manufacturing baseline each one calls for.
01 / Site type
Distribution-level substations, gas governor stations, water treatment perimeter. LPS 1175 SR3 as the new-build baseline across most DNOs. Kiosk doors, walk-in enclosure doors, gatehouse access with matched window resistance where applicable.
LPS 1175 SR3
02 / Site type
Transmission substations, critical interconnectors, national network assets. CPNI guidance applies. SR4 minimum with ballistic glazing options where the threat assessment requires it. EMC and EMP-shielded variants on the higher tiers.
LPS 1175 SR4 · CPNI
03 / Site type
Rural distribution kiosks, copper-theft hotspots, EV charging hub enclosures. Anti-cut and anti-pry detail at SR2-3. Volume-deployable fabric with consistent factory finish across a fleet rollout.
LPS 1175 SR2-3
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Products that fit
Most utility projects pull from these two product lines, often with integrated ventilation grilles and matched window resistance to door spec. Safe rooms and shopfronts don’t apply in this sector.
01 / Capability
LPS 1175 SR2 through SR4 across the kiosk, enclosure and gatehouse range. Ventilation grilles integrated to fabric rather than cut in. Anti-cut and anti-pry hardware as standard on rural deployments. Bespoke ironmongery for DNO and TNO key suites.
02 / Capability
Matched window resistance to the door spec across the same SR range. Ballistic glazing options on CPNI-listed sites. EMC and EMP-shielded variants for the data-adjacent end of the utility estate. Fixed glazing standard on most kiosk and enclosure applications.
Compliance breakdown
The compliance frameworks a DNO or utility procurement team will check first, and what each one covers in plain terms.
Standard
Typical rating
Where it applies
Detail
LPS 1175
Standard substation new build across most DNOs. LPCB-tested resistance to a defined attack-tool set, third-party verified. The new floor in this sector.
LPS 1175 (CPNI)
Transmission and critical national infrastructure sites. CPNI guidance applies. SR4 minimum with ballistic glazing on the high-threat profiles.
OFGEM ENA
Energy Networks Association recommendations for substation physical security. Sits alongside CPNI rather than replacing it. Referenced on most DNO procurement briefs.
ENA reference
BS EN 62271
High-voltage switchgear and controlgear standard. Touches enclosure spec on the medium and high-voltage end, including IP rating and access detail.
EN reference
The four rows above are the standards a utility procurement team will check first. Project-specific specifications may layer on others – environmental (IP66 / IK10), fire compartment, and DNO-specific key suites and ironmongery schedules. The LPS 1175 page covers the most-asked-about rating in detail.
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Selected projects
Case studies for the utilities sector are in preparation. Selected DNO substation, water utility, and EV charging hub projects will appear here as they’re cleared for publication. In the meantime, the full case studies index covers projects across all six sectors.
Fort Engineering manufactures. DNO, utility and EV charging procurement is fulfilled by Fort Security Doors, our commercial customer brand.
