Moat in my mind has two important things - huge barriers to entry and pricing power (these both maybe linked I imagine). Barriers to entry maybe because of high brand recall (gillette), scale (walmart) or legislation (utilities typically). In the Indian context the best company I can think of from barrier to entry standpoint is Container Corporation. They have a vast network which will be impossible for anybody to recreate. This I think gives them substantial moat. Also, reasonable pricing power too, but they have to compete with trauck operators. So that reduces the potential.
On similar lines is GAIL. Very strong netwrok, hard to replicate. ONGC is my mind is also has similar streghts because of their scale and because of govt backing. But more than scale, I think its govt backing that will keep them in business. ONGC is not just another oil company - it is India's flag bearing oil company.
Castrol also looks strong due to strong brand recall. Any other lube company will have to labor for decades and spend zillions on ads and product quality to get that type of brand recall, in my opinion. Pidilite also fits the bill here.
Also, I have been trying to locate moat from financials (not just by understanding biz models) since I figured that if I could discover a financial method to identify moats, I would have a far more objective way. If I were to follow Concor's financials, the theme I can see there is very high double digit profit margins, very high return on equity and zero/low debt. These three metrics, in my mind, show a sedate competitive environment. The moat is wide, fort is strong, and there are no enemies in sight!! A double digit margin shows low competitive pressure. High ROE shows that the business doesnt have to constantly add equity to survive. Low debt shows that there is no pressure to expand crazily by using dangerous levels of leverage. All the above mentioned companies fit this from a financials standpoint. Locating moat from financials appears a much more objective way than evaluating business models. Thoughts from any one on this would be most appreciated.