Willdan Group Inc. in Anaheim bought Integral Analytics Inc. in Cincinnati.

Willdan is an engineering firm that works with utilities, public agencies, and companies on energy efficiency.

Integral Analytics makes data analytics and forecasting software for some of the same kinds of clients.

Willdan traded recently at about a $284 million market cap, up 40% year-to-date and more than double over the last 12 months.

It didn’t disclose a purchase price for the acquisition; it said the buy will not affect 2017 revenue or earnings but will add about $10 million in revenue for 2018.

Willdan Group reported $8.3 million in net income on $209 million in 2016 revenue.