CalvarisEnergy
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Construction · Project Management · Site Supervision

Renewable energy projects, built with discipline — wherever they are needed.

Calvaris Energy's core business is construction, project management and construction supervision of renewable energy projects: ground-mounted solar plants, onshore wind farms, battery storage systems, and cable routes and substations for data centres — internationally, for developers, investors, utilities and industry.

Start a project → Our capabilities

Internationally oriented· All project phases from a single source· Headquartered on the Isle of Man

30+Years our parent company has been established on the Isle of Man
4Core services: site management, project management, site supervision, due diligence
5Business areas: solar parks, wind farms, battery storage, cable routes, substations
25+Accountable partners — from detailed design to handover
Who we serve

Four client groups, one delivery standard

Whether you consume energy, develop it, distribute it or buy the hardware — the engineering discipline behind every Calvaris project is the same.

Data centre campus with solar field, wind turbines, battery storage and substation

Industry & data centres

On-site generation, battery storage and dedicated grid infrastructure for energy-intensive operations and data centres — built, managed and supervised by one partner.

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Aerial view of a hybrid energy landscape with wind farm, solar field, data centre and grid infrastructure

Developers & investors

Co-development, owner's engineering, technical due diligence and turnkey EPC delivery — bankable documentation for acquisition, financing and exit.

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High-voltage substation feeding the transmission grid

Utilities & grid operators

Utility-scale wind and solar parks, grid-scale battery storage, substations and grid connection — planned, built and commissioned to network operator requirements.

Business areas →
Containerised battery energy storage system

Product customers

Battery storage, photovoltaics for self-supply and smart wind solutions — from single commercial installations to grid-scale systems.

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Services

Our focus: construction, project management & site supervision

We lead, build and supervise renewable energy projects on site — and provide the engineering around it. Every service also available as a standalone mandate.

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01

Project management

End-to-end management of renewable energy builds: schedule, budget, contracts, interfaces, claims and reporting — from notice to proceed to handover.

02

Construction

Construction of solar parks, onshore wind farms, battery storage systems and grid infrastructure — as EPC partner or as construction manager on your behalf.

03

Construction supervision

Independent site supervision: quality assurance, HSE, progress and cost control, documentation, commissioning support and structured handover.

04

Technical planning & design

Concept, basic and detailed design, specifications, tendering, bid evaluation and contract award — the engineering that makes the build run smoothly.

05

Technical due diligence

Independent technical assessment of projects and operating assets for buyers, sellers and financing banks — risk register, yield review and CAPEX/OPEX validation.

Your project doesn't fit a category?

Most international projects don't. Tell us the site, the stage and the constraint — we will tell you honestly whether we are the right partner.

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Business areas

Four business areas, one delivery standard

We build utility-scale generation, storage and grid infrastructure — as standalone plants, hybrid parks or dedicated power and grid solutions for data centres.

Ground-mounted solar park in an open landscape

Ground-mounted solar

Utility-scale ground-mounted PV plants — from detailed design and tendering to turnkey construction, supervision and grid connection.

Utility-scale solar parks
Onshore wind farm above green fields and forest

Onshore wind

Onshore wind turbines and wind farms — intelligently sited, yield-optimised, built and supervised in harmony with landscape and grid.

Turbines and wind farms
Rows of containerised battery storage systems with cable trenches and substation

Battery storage systems

Grid-scale BESS for peak shaving, arbitrage, backup and grid services — containerised systems built around your load profile or market case.

Commercial to grid-scale
Substation with an open cable route leading to a data centre campus

Cable routes & substations for data centres

HV/MV cable routes, substations, transformer stations and grid connections — engineered and built for hyperscale and colocation data centres.

MV and HV infrastructure
Why Calvaris Energy

Engineering-led, not sales-led

International projects fail on details — grid capacity, permits, ground conditions, schedules. We work the details first.

One partner

Every phase, one accountability

Development, permitting, design, construction and commissioning under a single contract — no gaps between consultants and contractors.

Engineering

Decisions backed by analysis

Yield studies, grid screening and cost models come before the pitch. If a site does not work, you hear it early rather than late.

Bankability

Documentation lenders accept

Technical documentation, risk registers and reporting prepared to the standard financing banks and technical advisors expect.

Longevity

Built for a 25-year horizon

Component selection, corrosion protection and maintenance access planned for the full asset life, not just for handover day.

The company

An island origin. An international outlook.

The name Calvaris is inspired by the Calf of Man — the small offshore island that stands for unspoilt nature, strong winds, coastal landscape and biodiversity. That origin carries a commitment: use natural resources responsibly and create value that lasts.

Calvaris Energy combines this connection to nature with modern engineering and a clear international focus — as an independent brand and business division of Select Management Services Ltd, established on the Isle of Man for more than 33 years.

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    A business division of Select Management Services Ltd — more than 33 years on the Isle of Man
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    Internationally oriented — projects and partnerships across borders
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    Core strength on site: construction, project management and construction supervision
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    International project experience across solar, wind, storage and grid infrastructure
Coastal island campus at sunset with a green-roofed glass building, solar field, battery storage and substation above the sea
Isle of ManRegistered seat · international delivery
From the strength of nature, we shape the sustainable legacy of tomorrow.

The Calvaris Energy mission

Contact

Tell us about your project

Send us the essentials and the right engineer will come back to you — normally within one working day.