Is NGG or TGS more undervalued in 2026?

CirclFi compares National Grid Transco, PLC Nati (NGG) and Transportadora de Gas del Sur S (TGS) using 13 institutional-grade valuation models. NGG has a Quality of Company score of 7.1/10 while TGS scores 8.7/10.

Which is a better buy — NGG or TGS?

Compare intrinsic values from 13 independent models against current market prices. CirclFi also calculates Value Trap scores. This is not financial advice — conduct your own analysis.

How do NGG and TGS valuations compare?

NGG at $81.53 and TGS at $31.08 are compared across Bayesian DCF, EPV, EROIC Spread, First Chicago, Markov DDM, and 8 additional models.

NGG vs TGS Valuation Comparison 2026 — Intrinsic Value Analysis

NGG

Natural Gas Transmission

National Grid Transco, PLC Nati

Quality

7.1

out of 10

Value Trap

SAFE

Price

$81.53

Last close

Models

12/13

Active

TGS

Natural Gas Transmission

Transportadora de Gas del Sur S

Quality

8.7

out of 10

Value Trap

SAFE

Price

$31.08

Last close

Models

13/13

Active

Model-by-Model Comparison

Model	Type	NGG Fair Value	NGG Upside	TGS Fair Value	TGS Upside
Bayesian DCF	Intrinsic	$8.51	-89.6%	$4.37	-85.9%
Earnings Power Value	Intrinsic	$55.50	-31.9%	$12.87	-58.6%
EROIC Spread	Intrinsic	$•••.••	••.•%	$•••.••	••.•%
First Chicago	Scenario	$•••.••	••.•%	$•••.••	••.•%
Markov DDM	Intrinsic	$•••.••	••.•%	$•••.••	••.•%
ML-RIV	Intrinsic	$•••.••	••.•%	$•••.••	••.•%
Dynamic NAV	Asset-Based	$•••.••	••.•%	$•••.••	••.•%
PWERM	Option-Based	$•••.••	••.•%	$•••.••	••.•%
Regime Cross-Sectional	Relative	$•••.••	••.•%	$•••.••	••.•%
Sentiment SOTP	Hybrid	$•••.••	••.•%	$•••.••	••.•%
CUCE Ensemble	Ensemble	$•••.••	••.•%	$•••.••	••.•%
FTNN Topology	Relative	$•••.••	••.•%	$•••.••	••.•%
RCMH-DCF	Intrinsic	$•••.••	••.•%	$•••.••	••.•%

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NGG vs TGS — Which Stock Is More Undervalued?

TGS scores higher with a 8.7/10 quality rating vs NGG's 7.1/10. Both stocks are analyzed daily using SEC EDGAR filings across 13 independent models.

Comparing National Grid Transco, PLC Nati (NGG) and Transportadora de Gas del Sur S (TGS) across 13 institutional-grade valuation models reveals how each company's intrinsic value stacks up against its market price. CirclFi's engine processes SEC EDGAR 10-K and 10-Q filings, FRED macroeconomic data, and GDELT news sentiment to generate independent fair value estimates daily.

NGG currently trades at $81.53 with a QOC of 7.1/10, while TGS trades at $31.08 with a QOC of 8.7/10.

Both companies are analyzed with models spanning intrinsic (Bayesian DCF, EPV), scenario-based (First Chicago), regime-switching (Markov DDM, RCMH-DCF), machine learning (ML-RIV, FTNN Topology), and ensemble methods (CUCE).