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The power-house at Newbrough Hall NY8768 : Newbrough Hall, was designed to conceal its true identity. When Newbrough Hall was modernised in 1902, introducing electricity into the early-19th Century interior was essential. Edinburgh architect, Francis William Deas (1862–1951), designed a detached power-house to resemble a quirky cottage, with gabled dormer, casement windows and a semi-octagonal turret. The only hint that the building was a working power-house was its unusual metal finial, inspired by contemporary power-generating apparatus.
Historic England blog: Link

A suitable electricity generation setup may have been a gas or petroleum fueled Tangye engine, powering a Higgs Motors dynamo (both firms from Birmingham).

The former Power House is a Grade II LIsted Building (List entry Number: 1045018): Link (Archive Link )