What is ATR in Romania?

ATR stands for Aviz Tehnic de Racordare — Technical Grid Connection Approval. It is the mandatory permit issued by the transmission or distribution network operator (Transelectrica for HV connections) that defines the technical conditions under which a consumer or generator can connect to the grid. Governed by ANRE Order 59/2013.

How long does the ATR process take?

The ATR study typically takes 6–12 months from submission of a complete application. The timeline depends on the complexity of the required grid studies, the need for new infrastructure, and Transelectrica's workload. Large industrial consumers (50–200 MW) should plan for 12 months.

Has the ATR been initiated at Resita?

Yes. The ATR study for the Resita Data site was initiated in April 2026. The development partner will receive the ATR results as part of the full technical due diligence package.

FAQ · Regulatory

ATR Romania: Grid Connection Approval Process

The mandatory technical approval for connecting a data center to Romania's transmission grid — explained step by step.

What is ATR?

Aviz Tehnic de Racordare (ATR) is Romania's mandatory grid connection technical approval, governed by ANRE Order 59/2013. Without an ATR, no building permit for a grid-connected facility can be issued. The ATR defines:

The maximum power allocation (MW) approved for the connection point
The voltage level and connection topology
Required grid works (new transformers, protection systems, cable/line construction)
Cost estimate for grid works (borne by the consumer)
Validity period (typically 24 months, extendable)

In Progress

April 2026

ATR initiated
at Resita site

6–12 mo

Typical study
duration

ANRE 59/2013

Governing
regulation

ATR Process Steps

Preliminary feasibility — Developer confirms site location and approximate MW requirement
ATR Application — Submitted to Transelectrica (for ≥110 kV connections) with technical data sheet
Transelectrica grid study — Load flow analysis, short-circuit study, stability assessment (6–12 months)
ATR Document — Issued with binding technical conditions and works specification
Connection Agreement — Commercial contract; developer funds the specified grid works
Grid works construction — Developer or Transelectrica builds agreed infrastructure
Energisation — Transelectrica connects and energises the point

Resita Site ATR Status

The ATR study for Resita Data was initiated in April 2026. The study covers a consumer connection at the adjacent 650 MVA Transelectrica substation (400/220/110 kV). The development partner will receive ATR results and associated cost estimates as part of the full technical due diligence package, covered by NDA.

Related: Grid connection overview · ATR glossary entry · Infrastructure page