Solar irrigation pump
Solar irrigation pump

Aurangabad: In Jalgaon village, many farmers spend sleepless nights to irrigate their fields, as power for irrigation isn’t available during the daytime for 15 days a month, but Dattaji Balaji Kikole, 62, doesn’t need to strain himself. Reason: Kikole has got a three-horsepower (hp) solar pump installed under the Atal Solar Krishi Pump Yojana launched by the state government in 2017. Now, uninterrupted and free power is available during daytime at the push of a button, he says.

Over the last two years, 45 farmers in Jalgaon in Buldhana district have got solar pumps installed in their fields. Of the 52 farmers still using electric pumps, many have applied for solar ones.With a 95 per cent subsidy available on solar pumps, farmers are required to pay Rs34,750 upfront. The maintenance cost is almost nil.

Compared to this, installation of an electric pump costs up to Rs1 lakh. On average, a farmer using a 3hp electric pump accrues a bill of Rs3,000 a year, which is waived by the government most of the time, says Gajanand Rao Wajh of Jalgaon. But even if electricity for agriculture is cheap or free, the problem with pumps is maintenance cost is high and erratic power supply renders them useless, farmers said. Daytime, uninterrupted power supply, and low maintenance cost have made solar pumps an attractive option among the farmers.

Though the off-grid solar pumps have made life easy for farmers in Jalgaon, as these have resolved the issue of voltage fluctuation and interruption, many fear they are likely to lead to over exploitation of groundwater. In the last 10 years, Jalgaon’s groundwater table has fallen by 25 ft, Namdev Patti Ipper, 65, claims.

The farmers got to know about this when they applied for pumps with the agriculture dept. Deepak Joshi of the Jai Jawan Jai Kisan farmers’ club here says the land in the region is rocky and the groundwater table is shallow. “One can find water up to 45-50 ft. Thereafter, there are layers of basalt rocks that run up to 500 metres. It means there isn’t eno­u­gh groundwater in the first place,” he said, adding free, uninterrupted power via solar pumps will lead to more withdrawal of groundwater.

This raises serious questions about central and state governments’ schemes that pitch solar pumps as a means of assured irrigation and to reduce power subsidy burden, which is Rs50,000 crore a year currently. The Centre recently approved the KUSUM scheme under which around 17.5 lakh off-grid and 10 lakh on-grid solar pumps will be installed in rural areas by 2022. Proponents of solar pumps also say states where agricultural power supply is most erratic or non-existent, such as Bihar, UP and West Bengal, farmers rely heavily on diesel pumps.

According to an estimate, the fuel cost of operating a five-hp diesel pump is as high as Rs42,000 per year for 500 hours of operation. If solar pumps replace diesel pumps, they can help farmers reduce input cost and carbon footprint, says D K Singh, Principal Scientist, Water Technology Centre, Indian Agricultural Research Institute. “But clean energy doesn't always mean green energy. We have enough evidence from states like Punjab, Haryana and Tamil Nadu about the impact of highly subsidised power on groundwater withdrawal.Large-scale solar pump deployment without a comprehensive plan to monitor and control water usage would be equally disastrous," says Chandra Bhushan, deputy director-general of Centre for Science and Environment.

A CSE survey in Buldhana also found that off-grid solar pumps lie under-utilised for 4-5 months in the summers when farmers don't take up any agricultural activity due to water scarcity. The utilisation of pumps at present is 33 per cent.

It also found after transitioning to solar pumps, irrigation time decreased from an average of 795 hours per year to 627 hours per year. The lack of groundwater is the primary reason for the lower solar pump use.

"Over the last 15-20 years, the water table dipped from 50-100 ft to 100-300 ft.Most solar pumps in the area were installed in the past 3-4 years, during which rainfall was scarce, further depleting the water table," it says in a report titled 'Silver Bullet-are solar pump a panacea for irrigation, farmer distress, and discom losses?'.

The report says farmers of Buldhana's Huada village rejected the idea of investing in solar pumps as they believe it would be ineffective due to water crisis. CSE's surveys in UP's Pilibhit showed the state's solar pump policy aimed at providing higher support to marginal and small farmers, its poor implementation resulted in large farmers taking subsidy for multiple small pumps."Two new models suggested in the KUSUM scheme – solarisation of agricultural feeders and on-grid solar pumps – are economically superior to off-grid pumps as the excess electricity can be injected into the grid.However, none of the alternatives have specific measures and mandates to limit water use," it said. Singh says apprehensions about over groundwater exploitation shouldn't be reason to oppose propagation of solar pumps as the situation varies across the country. "Type of soil, good rainfall allows quick replenishment of groundwater in eastern UP, Bihar, and West Bengal. There should be no fear about the excess withdrawal of groundwater," he says. Devanand Doifode, 33, a farmer in Jalgaon said the government is promoting drip irrigation in the water-scarce region and installation costs Rs 40,000 per acre. On this, farmers get around 70 per cent subsidy.

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