General Knowledge: Choosing a Clinic Power Supply
A rural clinic serving about 1,800 people needs reliable electricity for 24-hour vaccine refrigeration. The regional council is comparing three options. Grid extension would cost N$480,000, take 14 months, and then cost about N$3,200 a month in electricity. A solar hybrid system would cost N$620,000, take 4 months, require N$1,100 a month in maintenance, and need a N$90,000 battery replacement in year 7. A diesel generator would cost N$80,000 to install but N$4,500 a month in fuel alone, and outages and fuel shortages are common. The council has N$500,000 in its own budget. It also has a N$150,000 grant that expires in six months and may be used only for renewable energy. The clinic currently has no reliable power, and the vaccine refrigerator cannot be without power for more than four hours.
1. Which of the three options is most feasible given the budget and grant conditions? Show the budget reasoning and identify one non-budget constraint.
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Grid extension: N$480,000 fits the council budget but cannot use the grant, and it takes 14 months. Solar hybrid: N$620,000 minus the N$150,000 renewable grant = N$470,000, which fits the N$500,000 budget, and it can be completed in 4 months. Diesel: N$80,000 capital fits, but fuel is N$4,500 per month and reliability is poor, which conflicts with 24-hour vaccine refrigeration. On budget and grant conditions, solar is the only option that uses the expiring grant and stays within the council's own funds. The non-budget constraint is time: solar can be installed before the grant expires and far sooner than the grid. Grid is not infeasible on cash alone, but it wastes the grant and delays the clinic.
2. A councillor argues: 'Solar maintenance is only N$1,100 a month, while diesel fuel is N$4,500 a month, so solar is cheaper over its life.' Identify the hidden assumption and explain what comparison would test the claim.
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The comparison ignores capital cost and battery replacement. Solar costs N$620,000 up front and needs a N$90,000 battery in year 7; diesel costs N$80,000 up front but N$4,500 a month in fuel alone. The hidden assumption is that the solar system will last long enough, and produce enough power, for the fuel savings to recover the extra capital cost. To test it, compare total 10-year costs: solar = 620,000 + (10 × 12 × 1,100) + 90,000 = N$842,000; diesel = 80,000 + (10 × 12 × 4,500) = N$620,000, before diesel maintenance and downtime. On these figures diesel is cheaper over 10 years, so the councillor's conclusion does not follow from the monthly figures alone. Reliability and grant conditions must also be weighed.
3. A second councillor says, 'We should choose solar because every modern clinic is going solar.' Name the reasoning flaw and state one question the council should ask instead.
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This is an appeal to popularity or novelty: the fact that other clinics choose solar does not show that solar is the best choice here. The council's situation has specific constraints: a grant that expires in six months, a N$500,000 budget, 24-hour refrigeration, and a 14-month grid wait. The relevant question is not 'what is modern?' but 'which option meets the clinic's power needs at the lowest reliable lifecycle cost within the grant deadline?' The council should ask for a lifecycle cost comparison that includes battery replacement, fuel, maintenance, and the probability of outages. If solar wins on those criteria, the decision is justified; the popularity of solar is not the reason.