Local SEO for an electrical or solar installation company comes down to a narrow set of high-intent searches: service plus location, and sometimes service plus project type — think "industrial electrical contractor Lagos" rather than broad terms like "electrician".
The foundation is a set of dedicated service pages, each built around one service and the language your actual clients use, not internal jargon. Generic one-page sites tend to compete for nothing in particular and rank for nothing in particular.
From there, consistent business information across your website and listings, paired with real project pages, does most of the remaining work over time.