Pelican Park High School tops Cape Town energy challenge

How one school rewrote the rules of energy saving - and what every learner, teacher and city can copy

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From Invitation to Experiment

In the last week of February, the City’s Energy & Climate Change Directorate dropped a challenge that looked almost playful: cut campus electricity by ten percent within six school days. Nine public high schools - Pelican Park, Groenvlei, Vista Nova, Mondale, Phoenix, Westridge, Zonnebloem, Spine Road and Harold Cressy - signed up. Every participating team received a shoebox of tools: three clamp-on loggers, a sleeve of long-life LED tubes, a 20-watt mini-panel, a Raspberry Pi, a roll of reflective film and a pocket guide called “Energy Detective in 90 Minutes.”

Teams had until May to record baseline readings, try at least two interventions and show the link between behaviour and kilowatt-hours on an A2 poster plus a three-minute video. Marks were awarded according to three strictly weighted yardsticks. Measured savings carried 40 percent of the score. The artistic and narrative power of the poster claimed another 30 percent. The final 30 percent came down to transferability - could a no-budget rural or township school copy the fix tomorrow?

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Anatomy of a Quiet Revolution

Pelican Park High in Lotus River is 38 years old. Its 1 375 learners and 68 staff remember an era when the only powered items on site were the bell and a kettle in the staff room. By 2022 the campus had 57 split-unit air-conditioners, 14 photocopiers, six fridge-freezers and 183 fluorescent tubes.

Baseline Shock

Grade 10’s “Eco-Pelicans” clamped loggers to the main incomer for two weeks and found the school gulping 750 kilowatt-hours on an average weekday. At 09:45 every Tuesday the graph spiked to 963 kWh the moment all computer labs booted up for Computer Applications Technology. HVAC units were the single biggest culprit at 38 percent of the load, while lighting plus office gear added another 27 percent.

Nudging the Thermostat

Instead of simply outlawing air-conditioners, the learners drafted a “comfort charter” with teachers. Cooling set-points shifted from 20 °C to 24 °C. Devices had to rest at 11:00 and again at 14:00 for an “airing recess.” Simple coloured thermometers - green means comfort, red means over-cooled - were glued above every switch so that anyone could see when to open a window instead of cranking the dial. The hardware store donated the gauges free of charge.

Tubes, Heat Sinks and a Raspberry Pi

Grade 11’s “Circuit Breakers” unscrewed every old T8 fluorescent tube and slipped in 14-watt LEDs, re-using the magnetic ballast only as a starter - an up-cycling trick picked up from a free University of Cape Town micro-course. In the server room they scrounged discarded computer heat sinks, thermal paste and 5-volt fans to build a passive–active chimney that vented hot air above roof level. Exhaust temperature fell from 47 °C to 34 °C and two 9 000 BTU air-conditioners have stayed off ever since.

The 20-watt panel could not drive any serious load, so pupils connected it to an Arduino weather station. Live temperature, humidity and CO₂ values now scroll across the staff-room television. The moment CO₂ tops 1 200 ppm the display turns red and someone cracks a window instead of firing up the HVAC.

Five-Day Confirmation

During the final monitoring window average consumption dropped to 634 kWh a day, a 15 percent cut. Judges underlined the key finding: three-quarters of the victory needed zero cash; only the last quarter demanded parts that cost under R1 000. Knowledge migrated faster than money.

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Runners-Up, Inclusion and the Power of Shadows

Groenvlei High almost quit on Day One when load-shedding struck right during the audit. Instead of packing up, teacher Mr Moosa turned the blackout into an impromptu exercise. Learners counted south-facing classrooms that still had usable light and designed a poster titled “Let the Dark Teach You,” a graphic-novel strip in which a teenager unplugs a heater while the silhouette of Table Mountain morphs into a giant battery symbol.

Vista Nova in Rondebosch, a campus for learners with diverse physical and neurological needs, produced a tactile poster. Sandpaper stood for coal, bubble-wrap for solar cells, cotton wool for insulation, enabling visually impaired learners to “feel” the journey of electrons. Their working intervention was equally inclusive: a motion-sensor system that activates LED strip lighting only when wheelchair users enter adapted toilets, shaving an estimated 180 kWh off the monthly bill.

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Mentors, Mayors and a 48-Year Echo

The City enlisted GreenCape and the non-profit Mila to stick with schools for six weeks of guided tinkering. At Pelican Park, mechanical engineer Aisha Williams explained “phantom load” - the electricity drawn by devices that pretend to be off. Learners borrowed municipal clamp meters and found that 37 percent of weekend consumption came from idle copiers, whiteboards and security cameras. A cheap plug-in timer now cuts all non-critical circuits from 18:00 Friday to 06:00 Monday.

The prize ceremony deliberately overlapped with Youth Day, the 48th anniversary of the 1976 Soweto uprising. Councillor Xanthea Limberg told the hall, “1976 learners changed the country’s political map; 2024 learners are redrawing the energy map.” The City released a policy sketch called “Schools as Micro-grids” that would require every new educational building from 2027 to contain at least 20 kWp of rooftop PV, a 10 kWh battery and a smart meter capable of Vehicle-to-Grid exchange. Pelican Park’s HVAC voucher will be swapped for a heat-recovery VRF system able to export cooling to nearby clinics during heat waves, turning the campus into a neighbourhood climate refuge.

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Toolkits, Textbooks and Taxis

Although only three schools climbed the podium, every participant received an encrypted folder with continuing resources: a spreadsheet template for weekly tracking, open-source plans for soda-can solar air heaters, a “Green Prefect” badge to insert into school governance rules and live access to the new Cape Town Energy Data Portal. Anonymised datasets from all nine schools will let learners run comparative studies across suburbs of different income levels.

Two weeks after the ceremony the Eco-Pelicans ran a free Saturday workshop at the local library. With cardboard models of their own school they showed 42 residents that a 15 percent demand cut saves real cash. Ward councillor Marita Petersen reported that seven households have since swapped electric geysers for solar water heaters.

The City’s stealth-released mobile web-app, “Energy Quest,” lets learners log daily meter readings and earn badges. Early findings show a nationwide Monday spike of 22 percent, traced to weekend security lights left on. That insight is already feeding the design of smarter street lighting.

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From Cape Flats to Carbon Negative

Running the numbers on the 2024 municipal tariff of R2.56 per kWh, Pelican Park’s 15 percent cut saves about R8 300 a month, R66 400 over a 200-day school year - enough for 332 science textbooks or five university bursaries. Combined savings across the nine schools equal roughly R510 000 annually, a figure set to swell once PV and batteries arrive.

From 2025 every Grade 8 learner in the province will complete a six-week module called “My School, My Power Station.” Lessons will lean on the same interval data and Python scripts the competition produced, fusing coding with climate action inside the standard timetable. Early conversations with Nairobi’s “Solar Kids” programme and São Paulo’s “Escola Energia” suggest Cape Town’s open-source portal will become the spine of the first South-South digital platform for school energy benchmarking.

[{"question": "

How did Cape Town high schools reduce electricity consumption?

", "answer": "Cape Town high schools reduced electricity consumption through a variety of innovative methods. Students became 'energy detectives,' adjusting HVAC settings (shifting cooling set-points from 20 °C to 24 °C), replacing fluorescent tubes with energy-efficient LEDs, building passive cooling systems (like a chimney venting hot air from a server room), and installing plug-in timers to eliminate phantom loads from devices like copiers and security cameras. They also implemented motion-sensor lighting and developed educational campaigns like a 'comfort charter' to encourage responsible energy use, often requiring little to no cash investment."},
{"question": "

What tools were provided to the participating schools?

", "answer": "Each participating school team received a shoebox of tools to help them with the challenge. This included three clamp-on loggers for measuring electricity usage, a sleeve of long-life LED tubes to replace older lighting, a 20-watt mini-panel for small-scale energy generation, a Raspberry Pi for data collection and analysis, a roll of reflective film for insulation, and a pocket guide titled 'Energy Detective in 90 Minutes' to assist with their investigations."},
{"question": "

What was the most significant energy saving achieved by a school?

", "answer": "Pelican Park High School achieved a significant 15% reduction in their average daily electricity consumption, dropping from 750 kilowatt-hours to 634 kilowatt-hours. This saving was achieved through various interventions, with the judges highlighting that three-quarters of this victory required zero cash investment, and the remaining quarter involved parts costing under R1,000."},
{"question": "

How did the competition encourage sustainability beyond saving electricity?

", "answer": "The competition encouraged sustainability in several ways. It fostered practical skills in energy management and data analysis among students. It also prioritized transferability, meaning solutions that could be replicated by other schools, including those with limited budgets. Furthermore, the City plans to integrate these learnings into policy, requiring new educational buildings from 2027 to include rooftop PV, batteries, and smart meters, and even converting campuses like Pelican Park into neighborhood climate refuges by exporting cooling to nearby clinics."},
{"question": "

What innovative educational approaches were used by some schools?

", "answer": "Schools used highly innovative educational approaches. Groenvlei High, during a load-shedding event, turned a blackout into an exercise, designing a poster about using natural light. Vista Nova, catering to learners with diverse needs, created a tactile poster using sandpaper for coal and bubble-wrap for solar cells, allowing visually impaired learners to 'feel' the journey of electrons. They also implemented an inclusive motion-sensor lighting system for wheelchair users."},
{"question": "

What is the long-term vision for energy education in Cape Town?

", "answer": "The long-term vision for energy education in Cape Town is ambitious. From 2025, every Grade 8 learner in the province will complete a six-week module called 'My School, My Power Station,' integrating coding with climate action using the data and Python scripts from the competition. The City also released a policy sketch for 'Schools as Micro-grids' and is developing an open-source portal, aiming to establish the first South-South digital platform for school energy benchmarking with programs in Nairobi and São Paulo."}]