This paper, which is partly based on field work conducted in some tubewell irrigated villages of Punjab, discusses the prevalence of underutilisation of shallow tubewetls in Punjab, both electric and diesel, and points out the scale bias in the extent of underutilisation. Further, the author briefly outlines the reasons for this bias and tries to point out its economic basis. Finally, the effect of underutilising electric and diesel tubewells on the cost and efficiency of irrigation is briefly discussed.