Learn About Us

About STG Nations Energy

We are an independent engineering practice for utility-scale solar, battery storage and AI data center infrastructure. We work for owners and developers — not for equipment vendors or EPC contractors.

Company Values

Engineering a Sustainable European Grid

STG Nations Energy is a US engineering practice built around utility-scale solar and battery storage. Our work to date has been in US markets — roughly 2,000 MW of solar delivered and 5.28 GWh of storage developed across the US, including a project carried through Duke Energy Progress interconnection to a signed agreement.

We are now applying that experience to European markets, starting with Romania. European clients contract us directly under a cross-border services agreement; where a deliverable requires a local stamp, we work alongside a locally attested design office.

Our Mission

To find the problems in a project while they are still cheap to fix — before financial close, before construction, before they show up in year three of operation.

Our Vision

A European market where connection capacity goes to the projects that are technically ready, and where the owner has an engineering answer of their own before the network operator gives theirs.

Core Values

Our Core Values

Three rules we hold to on every project.

Technical Independence

100% manufacturer-agnostic. We represent only the owner or investor, ensuring unbiased engineering design evaluations.

Traceable Numbers

Every figure comes from a formula with stated inputs. Where data is missing it is marked as an assumption, not filled in.

Scope Honesty

We say what we can deliver and what we cannot. Work requiring a local stamp or a fire protection engineer is named as such, and brought in rather than implied.

Leadership Team

The engineers who do the work.

Vasilii Smirnov

Principal Engineer

Founder & Principal Engineer

Ten years in utility-scale solar and storage: technical design, modelling and project coordination. Approximately 2,000 MW of solar delivered.

Most recently, development-stage battery storage in South Carolina totalling 5.28 GWh — an 800 MW / 3,200 MWh site in Marlboro County and a 520 MW / 2,080 MWh site in Darlington County, both on Duke Energy Progress corridors where the utility's transmission upgrade estimate exceeded $238 million. Rather than wait in a queue that was not moving, the projects were sized to relieve the constraint instead of adding to it. One reached a signed interconnection agreement.

That problem — connection as the binding constraint rather than a procedural step — is now Europe's problem too.

Justin T. Runnels

Senior Engineer — Field & Systems

Over twenty years in the solar and hydrogen energy industries, delivering innovative and sustainable solutions for industrial and utility customers — design, engineering consulting, scheduled repairs and O&M.

NABCEP Certified PV Professional with a BS in Physics. His competencies span strategic planning, business development, project management, data center engineering, financial analysis and account management.

His federal work was recognised by the United States Marine Corps in 2015 for more than 100 energy reduction projects valued at $35 million — bringing solar and wind to nearly every Marine Forces Reserve centre in the country, and contributing to a 20 percent reduction in energy intensity against the 2003 baseline.

With our principal engineer he delivered the 4.7 MW solar farm at Fort Campbell, Kentucky, covering design, construction and commissioning.

He also serves as CEO of SOLR Energy and President of Solenergy, LLC, the first Louisiana solar company.