When a heat wave hits New York City, many customers can soon expect a message from Con Ed, asking customers to conserve energy .

The reason is to protect the heat-strained electric grid, which, when taxed to the point of failure, can lead to blackouts and brownouts.

Addy Spiller, an Upper West Sider and founder of a product management business, said those messages from Con Ed drive her bananas.

“Listen, I don’t know how to use less electricity,” she said. “I already have the AC at a reasonable temperature. I don’t think I can do enough to help Con Ed on my own.”

But this summer, Spiller and her dog, Ranger, are among 65 households across the city actually doing more to help — and they don’t have to stop blasting their ACs on sweltering days. That’s because they’re participating in a

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