Solar and wind pumps replace diesel in a Cilacap rice village and the saving shows up per planting cycle

PT Pertamina Patra Niaga runs a social and environmental responsibility programme in Kalijaran, Cilacap, Central Java called MAPAN, short for Masyarakat Pengelola Pertanian Berkelanjutan, or sustainable agriculture management community. Its central component is an irrigation system powered by a hybrid of solar and wind generation.

The installed capacity is 15,250 watt peak, combining photovoltaic panels with wind turbines. The system delivers an average of about 150,000 litres of water a day to farmland. Annual emissions avoided are put at 2,860 kilograms of carbon dioxide equivalent.

The saving is measured in planting cycles, not years

The figure that makes this legible to a farmer is the economic one. Replacing diesel pumps with the hybrid system saves roughly Rp9 million per two planting cycles.

That framing is more useful than an annual saving would be, because it matches how the decision is actually experienced. A rice farmer does not budget in calendar years. Fuel for pumps is a cost incurred within a cycle, against a harvest realised at the end of it. Expressing the saving in the same unit as the cost puts the comparison in terms the person making the decision already uses.

The problems the programme set out to address were named plainly. Irrigation was limited. Farming had seen little modernisation or diversification. Climate change was pressing on agricultural productivity. Pumped irrigation addresses the first directly, and the energy source determines whether addressing it creates a new recurring fuel bill or removes one.

A pump that runs on diesel converts a water problem into a fuel problem. A pump that runs on sunlight and wind removes the fuel problem while solving the water one.

Why the hybrid, and why here

Pairing solar with wind on a system this small is a deliberate choice rather than an elaboration.

Irrigation demand is not uniform across the year. It concentrates around planting and through dry spells, which is precisely when a purely solar system is at its strongest but also when any shortfall matters most. Adding wind generation covers periods of heavy cloud, and in the wet season it can generate when solar output falls. For a system whose failure mode is a field going unwatered at a critical moment, that complementarity is worth the additional equipment.

The same reasoning appeared in the island technopark at Pulau Rengit, where solar, storage, wind and a fuel cell were layered because no single source covered every condition. Small isolated systems cannot lean on a grid when one source underperforms, so they carry the redundancy internally.

Scale is the other consideration. At 15,250 watt peak this is a small installation by any measure, roughly the size of a rooftop array on a large house. Its significance is not in the capacity but in what the capacity displaces and how repeatable the arrangement is. Indonesia has a very large number of villages where pumped irrigation runs on diesel, and a system of this size requires no transmission connection, no land acquisition beyond the plot it stands on, and no technical capability that a district level contractor lacks.

Energy inside a value chain rather than beside it

The more distinctive feature of MAPAN is that the energy component is not treated as a standalone installation.

The programme spans the agricultural value chain from irrigation through rice production, then processing, then waste management, and then diversification into other products including chips, salted eggs, rice and baby food. Energy enters at the irrigation stage but the programme is designed around what happens to the output afterwards.

That matters because irrigation alone raises yield, and raised yield without processing or market access can simply lower the farm gate price. Building the processing and diversification steps alongside the energy step is what converts more water into more income.

The inclusion of waste management in that chain is worth noting on its own. Rice production generates husk, straw and processing residues, and food processing adds more. A programme that stops at the harvest treats those as disposal. A programme that carries through to waste management can route them back as feedstock, animal bedding, compost or fuel. That is the circular structure applied at village scale, and it is the reason the diversification products at the end of the list, the chips and salted eggs and baby food, belong in the same description as the pumps at the start.

Delivery runs through eight stakeholder organisations, among them the farmer group GAPOKTAN Margo Sugih and the women farmers' group KWT Tandur Makmur. The 233 beneficiaries include smallholder farmers, women farmers, daily agricultural labourers, children and infants, and low income households. Dian Hapsari Firasati, Vice President Community Involvement Development at Pertamina Patra Niaga, described the intent as renewable energy delivering real and sustainable benefit to communities while strengthening agricultural productivity and economic independence. The model is being extended to three further agricultural sites.

Sirkularium's read for government and public institutions

Three observations follow for programme design.

The first concerns where distributed renewables compete best. Diesel pumps are among the most expensive ways to move water, because the fuel is bought retail, transported to the field and burned in small inefficient engines. Solar and wind pumping competes against that cost rather than against grid tariffs, which is a far easier comparison to win. Agricultural agencies mapping where to prioritise distributed renewables should start from where diesel pumping is currently concentrated, since that is where the payback is shortest.

The second concerns measuring in the user's units. The Rp9 million per two planting cycles figure is a communication decision as much as an accounting one, and it is the right one. Programmes that report avoided kilowatt hours or avoided tonnes of carbon are legible to ministries and invisible to farmers. Where adoption depends on a household decision, the saving should be expressed in the cycle, the harvest or the month, whichever is the unit in which that household already plans.

The third concerns bundling energy with what comes after it. This programme succeeds or fails on whether processing, waste management and product diversification develop alongside the pumping capacity. Public programmes frequently fund the equipment and leave the value chain to follow on its own, which is how irrigation improvements end up producing more crop at a lower price. Agricultural and energy agencies planning jointly, rather than sequentially, would avoid that outcome.

What to watch next is whether the three additional sites reproduce the whole value chain model or only the irrigation component, how the hybrid performs through a full dry season, and whether the cost per installed watt falls as the model is repeated.