Skip to main content
Watford Grammar School
Education

How Watford Grammar School saved £5,641 by uncovering hidden energy waste

Energy monitoring revealed that 60% of the school's energy was being consumed when the building was empty. With clear data, they took action and cut costs immediately.

£5,641Annual Savings
60%Of energy used outside school hours
24/7Real-time energy monitoring
Coat of arms with two shields, lions and wheat sheaves, and a banner reading "Sperate Parati".
Client feedback

They are helping me provide ways of reducing our energy costs and Zoe was excellent in arranging the installation of two AMR devices, which will definitely help us in our goal to reduce our energy usage. The service they offer really does go above and beyond the norm.

Mr Thorold

Watford Grammar School

Overview

We installed Purely Insights at Watford Grammar School for Boys to find out why energy bills stayed high with no clear explanation. Real-time monitoring uncovered a clear pattern of out-of-hours waste, and the school acted on it immediately.

Students in school uniform talking at a desk with open exercise books in a classroom.

The challenge

Watford Grammar School for Boys is an academy in Hertfordshire serving 11 to 18-year-olds. The school's facilities team was concerned about consistently high energy bills but had no way to pinpoint exactly where the money was going. Without granular data, it was impossible to understand whether the problem was inefficient equipment, poor scheduling, or something else entirely. They needed clarity before they could take action.

Long red brick building with dormer windows and round motifs, fronted by lawns and trees.

Our approachData-driven insight through real-time monitoring

We installed our energy monitoring software, Insights, across the school's infrastructure. The platform generates clear, actionable reports showing exactly where and when energy is being consumed, broken down by time of day, building area and system. The data revealed a striking pattern: the majority of energy consumption was happening during nights, early mornings and school holidays, times when the building should have been largely dormant.

Line chart of site temperature in °C against dates from 28 July to 25 August, showing max, average and min lines fluctuating

© 2026 Purely Energy Ltd. Terms of use.

Get a quote like Watford Grammar School's

Call us on 0161 521 3400 or get a bespoke quote and we will show you what is possible for your sites.