Utility-scale solar projects require tightly coordinated DC and AC engineering aligned with code, performance, and bankability requirements. American Power Engineers supports developers and EPCs across the full electrical scope.
Our team supports developers and EPCs with DC collection layouts, MV collection systems, inverter and transformer specifications, and POI coordination as one integrated scope rather than pieces handed between separate firms.
Utility-scale PV projects require DC and AC designs that satisfy code, meet independent engineer (IE) expectations for bankability, and remain buildable in the field. A design that models well but wasn’t checked against real construction tolerances is a common source of change orders we’re brought in to fix. We design against that from the start.
Standards our solar engineering is built against: NEC 690/691, IEEE 1547, IEEE 2800-2022, and UL 1741.
Why American Power Engineers
DC collection, MV collection, inverter, and POI engineering under one team.
Designs structured for IE review and owner expectations.
Field-tested design choices, not just modeling outputs.
Aligned with NEC 690/691, IEEE 1547, IEEE 2800, and UL 1741.
POI engineering integrated with the plant electrical design.
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Share a few details and our team will follow up to scope your utility scale solar farm engineering engagement. Qualified inquiries only — we respond to developers, utilities, EPCs, and industrial owners.
Tools & Platforms
Tools and platforms used on a given project depend on scope, utility requirements, and client preference.
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Core capability areas delivered as part of this engineering practice.
String, combiner, and DC collection design for fixed-tilt and single-axis tracker plants.
Inverter pad, MV collection, and transformer arrangement design.
DC and AC one-line development through construction-issue.
Inverter, transformer, and switchgear specification support.
POI single-line, protection, and utility coordination.
Issue-for-construction electrical drawing packages.
Structured engineering execution from scope definition to final deliverables.
Review site layout, equipment selection, and basis of design.
Develop DC and AC collection design aligned with project goals.
One-lines, protection coordination, and grounding.
Specifications and datasheets for major electrical equipment.
POI engineering and utility coordination.
RFI, submittal, and field support through energization.
Interconnection-driven studies for solar, wind, and BESS projects.
Planning and protection studies on transmission and distribution systems.
Arc flash, coordination, and short circuit work for plant safety and reliability.
Study support during design, and commissioning phases.
Generation interconnection and operational study support.
Studies supporting public-sector power infrastructure projects.
Planning a utility-scale PV project?
Download our placeholder Solar Engineering kickoff checklist to align scope and data early.
Representative engagements illustrating typical scope and approach.
project Type
Challenge
Coordinated DC and AC design needed within an aggressive EPC schedule.
Solution
Developed DC and AC collection design and POI coordination.
Result
Constructible electrical package supporting EPC milestones.
View Case Study →
project Type
Challenge
Layout changes required DC collection redesign mid-project.
Solution
Reworked combiner and string design while preserving schedule.
Result
Updated DC design integrated into construction package.
View Case Study →
project Type
Challenge
Plant POI required integrated substation and collection coordination.
Solution
Coordinated POI substation engineering with collection system design.
Result
Aligned POI and plant engineering deliverables.
View Case Study →
NEC 691 applies to large-scale PV electric supply stations meeting specific size and access-control criteria (generally installations over 5 MW with restricted public access), while NEC 690 covers PV systems more broadly. Many utility-scale projects qualify for 691, which offers more flexibility on certain requirements, but the determination depends on your specific site conditions. We confirm this early rather than assuming.
This depends on site layout, O&M strategy, and often the developer's existing equipment relationships, more than a single "better" technology. We evaluate it against your specific project goals rather than defaulting to one architecture see our take on inverter selection trade-offs for the general considerations.
Our core scope is electrical engineering DC/AC collection design, single-lines, and interconnection support. We coordinate closely with your energy yield modeling provider (PVsyst, Helioscope, etc.) to make sure the electrical design matches the assumptions in the yield model, but yield modeling itself typically sits with a separate specialist unless otherwise scoped.
Yes. We start with a technical review of the existing DC/AC design against current code requirements and interconnection status before recommending whether to proceed with the existing package or revise specific elements.
In our experience, the most common issues are string/combiner sizing that doesn't match as-procured equipment, and protection coordination that wasn't validated against the final utility interconnection requirements. Both are avoidable by keeping the electrical design and interconnection engineering under one coordinated review, which is how we structure this scope.
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HV/MV substation engineering with protection, control, civil coordination, and equipment specification support.
Utility interconnection studies, POI design support, and coordination with transmission and distribution owners.
BESS projects introduce protection, grounding, and interconnection challenges that differ from traditional generation.
Our team supports developers, utilities, EPCs, and industrial clients with precise, standards-aware engineering services across North America.
